Category: Class 7

Students can Download English Lesson 3 A Prayer to the Teacher Questions and Answers, Summary, Notes Pdf, Activity, Samacheer Kalvi 7th English Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th English Solutions Term 1 Prose Chapter 3 A Prayer to the Teacher

Reading
I. Which of these statements do you find in the speech?

1. Inclusion is essential for us to do well in life.
2. We should neglect others.
3. Communicate politely with the less privileged.
4. Teachers teach us to communicate well.
5. Effective Communication is inessential to excel in life.

Answer:
We find statement No. 1, 3 and 4 in the speech.

1. [✓]
2. [✗]
3. [✓]
4. [✓]
5. [✗]

II. Read the statements. Tick [✓] the correct words. You can tick more than one.

A Prayer To The Teacher Question 1.
We should develop the ability to learn from _____
Answer:
[✓] self
[✓] others
[✓] books

A Prayer To The Teacher Question And Answer Question 2.
Teachers help me to learn _____  things.
Answer:
[✓] new
[ ] bad
[✓] difficult

A Prayer To The Teacher Summary Question 3.
Teach me to appreciate
Answer:
[✓] nature
[ ] destruction
[✓] small creatures

A Prayer To The Teacher Book Back Answers Question 4.
We should learn to questions.
Answer:
[✓] ask
[✓] answer
[ ] discard

III. Answer the following questions in a sentence or two.

A Prayer To The Teacher 7th Standard Question 1.
What is inclusion? Why is it important?
Answer:
Inclusion is to value everyone beyond the boundaries irrespective of their differences. Inclusion is important to be successful in life.

A Prayer To The Teacher 7th Std Question 2.
What is good or effective communication?
Answer:
Good and effective communication are to be able to speak and write to convey what . we actually feel.

Prayer To The Teacher Question 3.
What should we learn from our teachers?
Answer:
We should learn newer and more difficult things from our teachers.

A Prayer To The Teacher Lesson Plan Question 4.
What kind of learning brings joy to you?
Answer:
Learning new ways to learn brings joy to us.

A Prayer To The Teacher Theme Question 5.
In what ways are we doing injustice to nature?
Answer:
We do injustice to nature by felling trees, killing small creatures and causing urban decay.

A Prayer To The Teacher Prose 7th Standard Question 6.
What do you need to learn to live a good life in this world?
Answer:
To live a good life in this world we need to learn to appreciate the interconnected nature of things.

The Prayer To The Teacher Question 7.
How does the ability to question help us?
Answer:
The ability to question helps us to get answers, to establish better order of things, to be accountable and in the end it helps us to see the truth emerge.

A Prayer To The Teacher Lesson Question 8.
What do you think are the two most important lessons that the speaker mentions?
Answer:
The two most important lessons the speaker mentions are to stress our point without raising our voice and to raise our voice when our silence hurts another life.

IV. Answer the following questions in detail.

Samacheer Kalvi Guru 7th English Question 1.
What are the skills / values a teacher should teach their students to live in this competitive world?
Answer:
To live in this competitive world, our teachers should teach their students important skills and values like, the value of inclusion, ability to communicate both written and verbal, the ability to learn newer and more difficult things.

Samacheer Kalvi Guru English 7th Standard Question 2.
What kind of a life do you want to lead in this world?
Answer:
When I live in this world I want to live a patriotic life which means having tolerance towards others with a different opinion in matters like religion, race, etc. I would like to consider all people in the world suffering from poverty, disease and hunger as my own and help them. Violence should not be found in my environment. I should have the strength to love all my fellow human beings with all their short comings. I should see unity in diversity. I must not consider anyone from any part of the globe as foreigner or stranger but as brother and sister. I wish to live a peaceful life without any barbed wires or smoking guns.

Vocabulary

Prefix And Suffix

A. Match the suitable prefix and suffix to create new words of your own. One has been done for you.
Answer:

B. Refer to your dictionary. Add a prefix or suffix to the following words and find their antonyms.
Answer:

1. privileged × underprivileged
2. animate × inanimate
3. discriminate × indiscriminate
4. empty × unempty
5. communicate × miscommunicate
6. learn × unlearn

Listening

C. Listen to the story and fill in the blanks by selecting the right option.

1. Raj was upset as he had done ______ (Well/poorly) in his english test
2. His grandmother gave him a ______ (pen/pencil)
3. Granny compared ______ (Raj / Ravi) with the pencil.
4. Raj’s pain of not doing well in his test was compared with ______ of Pencil. (Sharping/ writing)
5. Raj understood that failures are stepping stones to _____ (success/climbing)

Answer:

1. Poorly
2. Pencil
3. Raj
4. Sharping
5. success

Speaking

D. Read the story. Divide yourselves into groups of four. Discuss what little Sarah wants to talk about. Take roles and enact the story.
Answer:
Anitha, Banu, Chitra and Daisy discuss what Little Sarah wants to talk about.
Anitha : Why is Sarah sad?
Banu : Sarah’s father got a transfer to another city. So Sarah was moved to a new house and a new school in the new city.
Chitra : Oh! Is she sad because she missed her old home and old school friends?
Daisy : Yes. She wanted to express her sad feelings to her close relatives.
Anitha : Do you mean to her parents and brother?
Banu : But poor thing, they did not listen to her in their busy work.
Chitra : Was she able to tell her feelings to any one?
Daisy : Her teacher Ms. Nancy saw her new student Sarah sad. She called her and asked the reason.
Anitha : Sure. Sarah would have told how badly she missed her dear friends and her home. Was the teacher able to make her happy?
Banu : Of course. The teacher listened to Sarah patiently and told her that the people near her present home and school are also good and assure she would earn good friends soon.
Chitra : The teacher had helped Sarah to develop a world view of things, to appreciate diversity and the power of loving her fellow human beings.
All : Yes!

Picto Grammar

E. Look at the pictures. Pick out the right preposition and fill in the speech bubbles given below.

Answer:

1. I’ am jumping over the box.
2. I can jump down from the box.
3. I’ am standing on the box.
4. I’ am carrying the box on my head.
5. I’ am sitting inside the box.
6. I’ am standing in front of the box
7. I’ am sitting in between the boxes.

Grammar

F. Read the following sentences carefully and underline the preposition
Answer:

1. Julian placed her lunchbox inside her bag. – Place Preposition
2. Vinothini left the house before sunrise. – Time Preposition
3. Ben saw Daisy playing across the road. – Place Preposition
4. Hema keeps all her teddy bears on top of her wardrobe. – Position Preposition
5. Divya hid the sweets behind her back. – Place Preposition
6. Sudha fell over during the basketball match. – Position Preposition
7. Madhusudhan checked to see if his keys had fallen underneath his chair. – Position Preposition
8. Mrs Meena asked the children to go into her classroom. – Place Preposition
9. After lunch, the children were allowed to play. – Time Preposition
10. Saravanan climbed onto the horse. – Position Preposition

G. Complete the following sentences using appropriate prepositions.

Question 1.
Is your mother _______ home?
(a) in
(b) at
(c) on
Answer:
(b) at

Question 2.
There is unity in diversity _______ the people.
(a) among
(b) between
(c) within
Answer:
(a) among

Question 3.
He discussed the problem _______ his parents.
(a) with
(b) to
(c) for
Answer:
(a) with

Question 4.
Lithisha was praised _______ her father.
(a) with
(b) for
(c) by
Answer:
(c) by

Question 5.
Can you finish the work _______ tomorrow?
(a) by
(b) in
(c) within
Answer:
(a) by

Question 6.
He has been absent _______ last week.
(a) since
(b) for
(c) by
Answer:
(a) since

H. Fill in the blanks using suitable positions from the box. Some options can be used more than once.

(across,with,on,to,by,since,from,about,into,at,during)

1. What do you do ______ weekends?
2. I am going to my village ______ Sunday.
3. I haven’t met my friends ______ December.
4. Run ______ the street and get me the ribbon.
5. He told me in detail ______ the incident.
6. ‘This picture was drawn ______ the girl ______ Charcoal
7. The car was travelling ______ a great speed.
8. The ball fell ______ the lake.
9. There is a bridge ______ the river.
10. The conference will be held ______ 10 a.m. ______ 5 p.m.

Answer:

1. during
2. on
3. since
4. on
5. about
6. by; with
7. at
8. into
9. across
10. from; tol

I. Fill up the blanks using suitable prepositions on your own.

1. The soldier climbed ________ a horse and rode away.
2. They have been here ________ a long time.
3. Kumaravel has lived in this city ________ 2012.
4. The paper was published ________ an International journal.
5. When will you return ________ home?
6. One ________ the four students wrote the answers correctly.
7. This fruit is ________ the Mexican capital.
8. The head offce is ________ Nungambakkam. It is College Road. As you go the station, the office is the right side.
9. The sailors were taken ________ the forest and made to walk 10 miles.
10. The girl standing ________ me was sneezing.

Answer:

1. on
2. for
3. since
4. in
5. back
6. of
7. from
8. at; on; through; at
9. through for
10. before

Writing

J. Fill in the value rees with the best qualities you like to follow ii ir life from the given list. Write a few lines about your favourite quality in the box.
Answer:

My favourite quality is Good manners. Good manners fetches good name for us. If we develop good manners from childhood it will continue till our adulthood. We shall be role models for others when we display good manners.

Creative Writing

K. Fill in the template given for limerick.
Answer:
There once was a chubby soft Teddy bear (8 syllable)
Whom cute baby had always near (8 syllable)
She played with him (5 syllable)
Even when she swim (5 syllable)
If Teddy’s lost don’t cry baby dear! (8 syllable)

A prayer to the Teacher Additional Questions

I. Choose the correct Synonyms from the options below.

Question 1.
emerge
(a) to appear
(b) come out
(c) reveal
Answer:
(b) come out

Question 2.
engulf
(a) swallow whole
(b) consume
(c) eat
Answer:
(a) swallow whole

Question 3.
nakedness
(a) frank
(b) open
(c) not hiding
Answer:
(a) frank

Question 4.
urban decay
(a) making city rot
(b) deteriorating the city
(c) destroy the city
Answer:
(c) destroy the city

Question 5.
gifted
(a) people with knowledge
(b) people blessed with everything
(c) giving fit
Answer:
(a) people with knowledge

Question 6.
cut throat
(a) highly competitive
(b) competitive
(c) cut the throat
Answer:
(a) highly competitive

Question 7.
value
(a) giving importance
(b) precious
(c) costly
Answer:
(a) giving importance

Question 8.
free
(a) without payment
(b) discount
(c) available without money
Answer:
(a) without payment

II. Pick the Correct Antonyms.

1. proportionate × ______ (disproportionate, unusual size, inequal)
2. unusual × ______ (usual, common, regular)
3. urban × ______ (village, suburban, town)
4.  accountable × ______ (unaccountable, not responsible, irresponsible)
5. imbalance × ______ (balance, not partial, equal)
6. animate × ______ (inanimate, not animal, non living)
7. tolerance × ______ (intolerance, not tolerate, not adjusting)
8. foreigner × ______ (native, inland person, citizen)
9. humility × ______ (proud, boasting, dominating)
10. indiscriminate × ______ (discriminate, judge carefully, identify)

Answer:

1. disproportionate
2. usual
3. village
4. unaccountable
5. balance
6. inanimate
7. intolerance
8. native
9. proud
10. discriminate

III. Choose the Correct Answer (MCQ).

Question 1.
I clean my house and empty the garbage on the road because the road is not ______ in what I feel is my own.
(a) included
(b) indulgence
(c) inclusion
Answer:
(a) included

Question 2.
I take my child to the movie but not my neighbour’s child because that child is beyond my zone of ______
(a) fostering
(b) caring
(c) parenting
Answer:
(c) parenting

Question 3.
Our depends on our power to impress ______
(a) survival
(b) impact
(c) honour
Answer:
(a) survival

Question 4.
We are ______ because we do not ask questions
(a) accountable
(b) learning
(c) enslaved
Answer:
(c) enslaved

Question 5.
The sea does not get ______ from us for the fish it gives us.
(a) tax
(b) royalties
(c) money
Answer:
(b) royalties

Question 6.
Poverty, disease and hunger have no ______
(a) diversity
(b) patriotism
(c) nationality
Answer:
(c) nationality

IV. Short Questions with Answers.

Question 1.
Give an introduction to the lesson ‘A Prayer to the Teacher’.
Answer:
The lesson A Prayer to the Teacher’ is actually the speech given by Subroto Bagchi, the Founder and CEO of Mindtree. The speech was the convocation address given to the teachers graduating from the International Academy for Creative Teaching at Bangalore in 2005.

Question 2.
What was the main theme of Subroto Bagchi’s speech?
Answer:
Subroto emphasizes mainly that the teachers should go beyond the syllabus and teach students the values and skills they need to live a useful and meaningful life.

Question 3.
What is the importance of the ‘power to impress’?
Answer:
Today’s students are forced to impress because their survival depends on their success in the rat race of common entrance tests and competitive exams and competitions.

Question 4.
‘Teach me also to raise my voice’. Is the author asking us to fight?
Answer:
No. The author wants us to speak thoughtfully to protect a life, one who is hurt and for truth. But at the same time when people unnecessarily shout, we should be silent, contemplate and act positively.

V. Paragraph Questions with Answers.

Question 1.
Define ‘inclusion’ and give three examples.
Answer:
Inclusion means valuing all people irrespective of their boundaries like financial and educational status, caste, creed, physical health, designation or nativity.
Examples:
1. Cleaning our house and emptying the garbage on the road because we do not feel the road is also ours.
2. Feeding our child in front of our hungry servant maid, not caring for her with a humanitarian heart that she also is one in our household.
3. Not taking the close neighbour’s child to the movie along with one’s own child, thereby not having a broad parental attitude.

Question 2.
List a few things we need to communicate and convey what we feel.
Answer:
We must be able to communicate with:

1. A simple innocent child and nature.
2. The disabled and the ones who are hard of hearing and speaking.
3. Those who are under privileged and less gifted than us.
4. People who are our seniors and elders as well as our juniors and youngsters.
5. With all the living as well as the nonliving things around.
   By communicating, the speaker means to protect, safe-guard, cherish and to keep them.

Question 3.
‘Teach me to appreciate the interconnected nature of things’. How?
Answer:
The speaker wants the teachers to create an awareness in students about nature when
they teach of nature. Example :

a) It is not just teaching the concept of ‘rising waves’ but also the reasoning what causes the waves to fall.

b) Teaching not only teach the use of fertilizers and pesticides, but even the damage they cause by killing small creatures and felling big trees.

c) We teach the protection and promotion of the interests of consumers but at the same time we must also teach the imbalance it causes in the natural state of things which causes death and destruction on the earth.

d) We must not just teach about birds like crows and sparrows but also teach what makes them to go extinct and how it could be prevented by saving them.

Question 4.
In this increasingly commercial world, the things that truly support life comes freely to us. Justify with suitable evidence.
Answer:
The things that help us to live are mostly got free.
We do not pay the cow for the milk she gives.
The earth does not ask us money for the crops it gives.
The sun that gives light, the air that helps to breathe, the river that gives water and the clouds which give rain do not get paid for their services.

Question 5.
How can we‘develop a world view of things’according to the speaker.
Answer:
The speaker stresses that we must have the ‘one world’ feeling. Poverty, disease and hunger in the world have to be removed. Patriotism in the world should not be intolerance towards religion and race. Enimity and wars in the future must be replaced with love for our fellow human beings. There should be unity in diversity. We should have tolerance towards the differences found in people. No one should be a ‘foreigner’ for us but all people in the world are our brothers and sisters.

VI. Explain the Following Terms.

Question 1.
Narrow domestic walls.
Answer:
Here the speaker Subroto narrates how India had been crushed in ‘narrow domestic walls’ Which means it has been divided by regions or barriers based on class, colour, caste, race, religion, ethnicity, etc. This narrow attitude opposes to a feeling of one united nation or one united human race. These barriers are not favourable for nationalism and internationalism.

Question 2.
‘Illuminated with the power of thousand Suns’
Answer:
As a concluding note of his convocation address, Subroto speaks these words to bless all the new graduates. Anyone, who graduates, dreams to take up the best career, do well in it, achieve and to be elevated. Hence Subroto abundantly blesses the life of the graduates to be lighted and bright, equivalent to the light given by a thousand Suns.

Question 3.
Power of silence.
Answer:
Sometimes silence is more louder than voices. Example if a son makes a mistake and faces his father, expecting that he would scold him and when he does not scold him, the son would feel the silence more painful than his words. Silence gives inner strength.

Question 4.
Engulf me and mine.
Answer:
Here the speaker says that if we continue to fell trees, kill animals, use enormous technology that destroys nature and causes natural imbalance, then one day our own habits and actions would completely damage and destroy us.

A Prayer to the Teacher Grammar Additional

I. Fill in the blanks with prepositional phrases.

Answer:

1. into the boat
2. in the dustbin
3. over the phone
4. over the track
5. on the road

II. Underline the place prepositional phrases.

Question 1.
Mani was at home when I called.
Answer:
Mani was at home when I called.

Question 2.
The tourists walked along the riverside.
Answer:
The tourists walked along the riverside.

Question 3.
You cannot park your car outside the restaurant.
Answer:
You cannot park your car outside the restaurant.

Question 4.
The flat on the second floor is vacant.
Answer:
The flat on the second floor is vacant.

Question 5.
Nana will put the baby in the cradle.
Answer:
Nana will put the baby in the cradle.

III. Underline the time prepositional phrases.

Question 1.
Chandran will call the doctor by 10.00 a.m.
Answer:
Chandran will call the doctor by 10.00 a.m.

Question 2.
Papa will have his medicine after breakfast.
Answer:
Papa will have his medicine after breakfast.

Question 3.
The buses are crowded during the morning.
Answer:
The buses are crowded during the morning.

Question 4.
I go for a walk in the evening.
Answer:
I go for a walk in the evening.

Question 5.
I have my interview at 11.00 a.m.
Answer:
I have my interview at 11.00 a.m.

IV. Underline the Position Prepositional Phrases.

Question 1.
Arun’s pen was found under the table.
Answer:
Arun’s pen was found under the table.

Question 2.
Ravi’s cap was below the lamppost.
Answer:
Ravi’s cap was below the lamppost.

Question 3.
The Principal sat near the Chief guest.
Answer:
The Principal sat near the Chief guest

Question 4.
The drone was moving above her head.
Answer:
The drone was moving above her head.

Question 5.
He clicked a photo on the Napier bridge.
Answer:
He clicked a photo on the Napier bridge

Warm up
Read the clues gues the professional and fill in the crosswords puzzle

Answer:

Question 1.
Which is the role of a farmer in society? Discuss and answer.
Farmers are the backbone of our country. They produce the food-crops, the oil-seeds, the commercial crops, and also some raw materials for our industries. Our food and dress materials are obtained from the hard work of farmers. Due to cotton cultivation, several textile mills were established and they gave employment opportunities for the unemployed.

Question 2.
When you grow up, what do you want to become? Why?
Answer:
When I grow up I want to become a Teacher because I can enlighten the children with knowledge.

A Prayer to the Teacher Summary

This lesson is the convocation address given by Subroto Bagchi, Founder and CEO, Mindtree, for the graduating teachers, their faculty and administrators.
The speaker first stresses on inclusion – valuing all people, irrespective of their boundaries like financial and educational status, caste, creed, physical strength, designation or nativity.

He gives three examples: Dumping the garbage on the road which is also ours. Feeding our child in front of our hungry servant maid without a humanitarian heart.

Secondly the speaker says that amidst the cut throat competition, the more we want to impress, the less we communicate. He emphasises to communicate with an innocent child, nature, the dumb and deaf, less gifted, the old and young, the living and non-living things around too. Thirdly he feels that teachers should prepare students for the wide world by teaching them newer and difficult things. Help to learn newer ways to learn that will make learning a joy. Fourthly Subroto emphasises to teach to appreciate the interconnected nature of things. Like creating an awareness about ‘nature’ while the topic ‘Nature’ is taught.

Example:

1. Teach not just the concept of ‘rising waves’ but also the reason why the waves fall.
2. Not only the use of fertilizers and pesticides but also the damages they cause.
3. Teach about birds like crows and sparrows how they go extinct and how to prevent it.

Subroto fifthly wants to inculcate the ability to question. This helps one to get answers, to establish better order of things, to be accountable and in the end it helps us to see the truth emerge.

The speaker sixthly clarifies that in this increasingly commercial world. All things that truly support life comes freely. The cow is not paid for the milk it gives, nor the earth asks money for the crops it gives. The sun gives light, air helps to breathe, the river gives water, clouds give rain, without getting paid for their services.

Seventhly the speaker wants the students to learn the ‘power of silence’. Stress our point without raising our voice and to raise our voice when our silence hurts another life.

Finally the speaker pleads the teachers to develop a world view of things by having a ‘one world’ feeling. By removing poverty, decrease and hunger in the world. Patriotism is not intolerance towards religion and race. Enmity was to be replaced with love for others. There should be unity in diversity. No one is a foreigner. All the people in the world are our siblings.

Students can Download English Lesson 2 The Red-Headed League Questions and Answers, Summary, Notes Pdf, Activity, Samacheer Kalvi 7th English Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th English Solutions Term 1 Supplementary Chapter 2 The Red-Headed League

A. Say whether the following statements are ‘True’ or ‘False’.

1. Photography was Vincent Spaulding’s hobby.
2. Mr. Ross did not want to hire Mr. Wilson.
3. Mr. Wilson worked for Mr. Ross for six weeks.
4. Mr. Jones was a lawyer.
5. Spaulding dug a tunnel from the cellar of the shop to the jewellery shop.

Answer:

1. False
2. False
3. False
4. False
5. False

B. Complete the table based on the information from the text.
Answer:

C. Answer the following questions.

The Red-Headed League Questions And Answers Pdf Question 1.
Why did Jabez Wilson meet Mr. Holmes?
Timid Jabez Wilson was a pawnshop owner. His assistant Spaulding made him join the job of copying the Encyclopaedia from 10.00 a.m. to 2.00 a.m. After eight weeks the office is closed and dissolved. He doubted someone is playing a joke on him and so he met Mr. Holmes for a solution.

The Red-Headed League 7th Standard Question Answer Question 2.
Describe Vincent Spaulding.
Answer:
Vincent Spaulding was a clever young man. He happily worked as the assistant for Mr. Wilson in his pawn shop for half-wages. He was actually John Clay, the notorious thief.

The Red Headed League Questions And Answers Question 3.
Why did Spaulding spend a lot of time in the cellar?
Answer:
Spaulding was spending a lot of time in the cellar of the pawnshop because he was making a tunnel to get into the strong room of the bank in the next street at the back of the shop.

Red Headed League Questions And Answers Question 4.
Why was Mr. Wilson hired to copy the Encyclopaedia?
Answer:
Mr. Wilson was hired to copy the Encyclopedia to keep him away from his pawnshop from 10.00 a.m. to 2.00 p.m. every day So that when Wilson went to work, Mr. Ross and Spaulding could have time to make the tunnel from his shop to the bank.

The Red-Headed League Questions And Answers Question 5.
How did Holmes’ team catch the thieves?
Answer:
The Holme’s team was ready at the strong room in the bank on Saturday night expecting the arrival of the thieves. When Spaulding and Ross came out from underground, Holmes caught Spaulding by his arm and the others caught Ross at the other end of the tunnel.

D. Based on your reading of the text complete the pyramid arranging the sequence in the correct order,

• Holmes found the tunnel from the cellar to the bank’s strong room.
• Wilson was assigned to copy the encyclopaedia.
• Wilson asked Sherlock Holmes for help.
• Wilson got the job in The Red – Headed League.
• Spaulding and Ross were caught by the famous detective.
• One day he found the notice that ‘The Red – Headed League’ was dissolved.
• Holmes recognised Spaulding who was actually John Clay, a notorious criminal.

Answer:

Project

E. Imagine you have visited a Mystery Theme Park you have come across. Make an eye¬catching advertisement with the help of the given dues.

• a mirror maze
• scary faces
• eerie sounds
• a ghostly figure
• a pitch dark room

Answer:

Connecting To Selfs

F. Observe the pictures carefully and write your answers.
Answer:

Step To Success

G. lust like the example, use the key to fill in the blanks and break the code

Answer:

1. SECRET
2. GHOST
3. TRICK
4. RIDDLE
5. PUZZLE

The Red-Headed League Additional Questions

I. Choose the correct answers

The Red-Headed League 7th Standard Question 1.
Wilson was accepted into the League by ______
(a) Dr. Watson
(b) Mr. Duncan Ross
(c) Mr. Vincent Spaulding
Answer:
(c) Mr. Vincent Spaulding

The Red Headed League 7th Standard Question 2.
I saw you hit the ______ with your walking stick
(a) ground
(b) man
(c) shop door
Answer:
(a) ground

The Red Headed League Book Back Answers Question 3.
Ross quickly gets back into the tunnel ______ wants to stop him but could not
(a) John Clay
(b) Jones
(c) Holmes
Answer:
(b) Jones

The Red-Headed League Book Back Answers Question 4.
The cellar was the shop ______ the shop
(a) behind
(b) in front of
(c) beside
Answer:
(c) beside

The Red Headed League Question Answer Question 5.
The bank does not open on ______
(a) Saturday
(b) Sunday
(c) Friday
Answer:
(b) Sunday

The Red Headed League Question And Answer Question 6.
Jabez Wilson was a timid red-haired ______
(a) doctor
(b) detective
(c) pawn broker
Answer:
(c) pawn broker

The Red Headed League Answers Question 7.
The ______ wanted Wilson away from the shop for some hours everyday.
(a) friends
(b) villains
(c) heroes
Answer:
(b) villains

The Red Headed League 7th Standard In English Question 8.
I ______ when Spaulding was happy to work for half-wages.
(a) suspected
(b) liked
(c) Holmes
Answer:
(a) suspected

II. dentify the Character / Speaker.

1. “How can I get to the Strand?”
2. “Yes, to the hospital”.
3. “My men are waiting at the front door of the bank”.
4. “You think of everything, Mr. Holmes.”
5. “So Spaulding is John Clay, the notorious thief”.
6. “Did you see his trousers? They were dirty”.

Answer:

1. Holmes
2. Dr. Watson
3. Mr. Jones
4. Spaulding
5. Dr. Watson
6. Holmes

III. Write True or False against each statement.

1. Holmes and Dr. Watson move to Wilsons shop in Saxe-Coburg Square.
2. Dr. Watson visits the apartment of his patient Sherlock Holmes.
3. I want your help tonight. Come at nine O’clock.
4. Holmes comes out from behind his box, and hits Spaulding’s arms.
5. Clay saw the colour of Ross’s hair and thought of a Red-Headed League.
6. “Spaulding often went down to the cellar”.
7. Because making a tunnel is a clean work”.
8. “Why is that young man making a tunnel?” I thought.

Answer:

1. True
2. False
3. False
4. True
5. True
6. True
7. False
8. True

IV. Very Short Questions with Answers.

The Red-Headed League Worksheet Answers Question 1.
Who was the red-haired client of Sherlock Holmes?
Answer:
The red-haired client of Sherlock Holmes was Jabez Wilson.

Question 2.
What was Wilson doing at the Red-Headed League daily?
Answer:
Wilson was copying out the Encyclopaedia Britannica.

Question 3.
Where was Dr. Watson working?
Answer:
Dr. Watson was working in the hospital.

Question 4.
What did Spaulding have in his hands when he came out of the ground?
Answer:
Spaulding had a gun in his hands.

Question 5.
Why were Spaulding’s trousers dirty?
Answer:
Spaulding’s trousers were dirty because making a tunnel is dirty work.

Question 6.
What made Holmes think that the tunnel was ready?
Answer:
Holmes thought the tunnel was ready as the Red-Headed League’s office was closed.

V. Short Questions with Answers.

Question 1.
Why did Vincent show the newspaper advertisement to Mr. Wilson?
Answer:
Vincent showed the advertisement about an opening in the Red-Headed League to Mr. Wilson to make him join the job so that he would be away from his pawn shop daily for a few hours. During that time Vincent and Ross planned to dig the tunnel from the shop cellar to the bank in the next street.

Question 2.
Holmes knew London very well then why should he ask the way to Strand?
Answer:
Holmes got information from Mr. Wilson and observes the pawn shop from outside. He also wanted to know who was inside and what were they doing. So he knocks the door of the shop and asks the way to Strand for namesake and finds out the truth.

Question 3.
Spaulding was happy to work for half wages. Why?
Answer:
Spaulding didn’t seek for a job. He wanted to find entry into the pawn shop by working as an assistant to Mr. Wilson. But his aim was to make a tunnel from the shop to the bank, hence he happily agreed for half wages.

VI. Characters with job description:

VII. Paragraph Questions with Answers.

Question 1.
Why did Holmes go to look at the road behind Saxe-Coburg Square?
Answer:
Mr. Wilson’s pawn shop was at Saxe-Coburg Square. It had a cellar beneath. When Holmes hit the ground with his stick in front of the shop, he found that the cellar was at the backside of the shop where Spaulding spent most of his time. Holmes saw Spaulding’s trouser legs dirty and guessed he was digging a tunnel. He wanted to find out where the tunnel led to. So Holmes went to look at the road behind Saxe-Coburg Square that was the next street at the back of the shop and found the bank there.

Question 2.
What arrangements had Holmes made to catch the thieves in the bank? How did they catch the culprits?
Answer:
Holmes, Dr Watson, Mr. Jones and a policeman put off the lights and waited behind the crates and boxes in the strong room at the bank. At the same time policemen wereput to wait at the front door of the bank and near the pawn shop to catch the thieves. At 11.15 p.m. light came through the stone floor of the strong room in the bank. The stones moved and Spaulding arrived first with a gun, followed by Ross. Holmes came and hit Spauldings arm, made him drop his gun and caught him. Ross jumped back into the tunnel and tried to escape but the men waiting at the other end of the tunnel in the pawn shop caught him.

VIII. Read the passage and answer the questions.

1. Holmes and Watson first visit the district in which Wilson’s shop is located, where Holmes does some mysterious things: He asks directions from a clerk at the pawnshop; he taps the street out-side with his walking stick and remarks that the case is complicated by the fact that it is Saturday. Later, he asks Watson to meet him at Baker Street that evening at ten, and to come armed.

Question 1.
Where did Holmes and Watson go?
Answer:
Holmes and Watson went to the district where Wilson’s shop was located.

Question 2.
State the two mysterious things Holmes did at Wilson’s shop?
Answer:
Holmes asked directions from the pawn shop clerk and he tapped the street with his walking stick.

Question 3.
When and where did Holmes ask Dr. Watson to meet him?
Answer:
Holmes asked Dr. Watson to meet him at Baker Street on Saturday night at ten.

2. When Watson arrives, he finds two other men there: Peter Jones, an inspector from Scotland Yard, and a Mr. Merry Weather, a bank director. Holmes takes them to a branch of the City and Suburban Bank, a branch located in the same district as Wilson’s pawnshop. There they enter the vaults of the bank, where Merry Weather shows them a shipment of thirty thousand gold coins they have recently received from the Bank of France. Holmes says that they may have some time to wait, and they sit quietly in the dim vault.

Question 1.
What was the name of the inspector from Scotland Yard?
Answer:
Mr. Peter Jones.

Question 2.
Who was Mr. Merry Weather ?
Answer:
Mr. Merry Weather was a bank director.

Question 3.
Where did Holmes take Mr. Jones and Mr. Merry Weather ?
Answer:
Holmes took them to the vault of a branch of a bank located in the same district as Wilsons pawnshop.

Question 4.
Who all went to the bank?
Answer:
Holmes, Dr. Watson, Mr. Jones and Mr. Merry Weather went to the bank.

Question 5.
What did Mr. Merry Weather show them at the vault of the bank?
Answer:
At the vault of the bank Mr. Merry Weather showed them a shipment of thirty thousand gold coins that they had recently received from the Bank of France.

Question 6.
Why did Holmes and others wait at the dim vault?
Answer:
Holmes and the others were waiting at the dim vault of the bank to catch the thieves.

IX. Rearrange the Jumbled Sentences.

A.
1. Then Holmes knocks the door of the shop and meets Spaulding.
2. Holmes and Watson go to Wilson’s shop at Saxe-Coburg Square.
3. Holmes noticed the dirty trousers of Spaulding.
4. Dr. Watson visits the apartment of his friend Sherlock Holmes.
5. Holmes suspected crime and goes to look the road behind the shop.
6. Holmes hits the ground outside the shop with his walking stick.
7. Dr. Watson listens to the unusual story of the Jabez Wilson.

Answer:
4. Dr. Watson visits the apartment of his friend Sherlock Holmes.
7. Dr. Watson listens to the unusual story of the Jabez Wilson.
2. Holmes and Watson go to Wilson’s shop at Saxe-Coburg Square.
6. Holmes hits the ground outside the shop with his walking stick.
1. Then Holmes knocks the door of the shop and meets Spaulding.
3. Holmes noticed the dirty trousers of Spaulding.
5. Holmes suspected crime and goes to look the road behind the shop.

B.
1. Three men waiting at the other end of the tunnel caught Ross.
2. Suddenly through the stone floor Spaulding comes out followed by Ross.
3.”So are you John Clay! Your Red-Headed League was clever” said Holmes.
4. Watson looks at his watch it was 11.15 p.m.
5. Holmes hits Spaulding’s arms and Ross quickly gets back into the tunnel.
6. Holmes, Watson, Jones and Policeman wait in the strong room at the bank.
7. Spaulding says, “you think of everything, Mr. Holmes. You’re very clever”.

Answer:
6. Holmes, Watson, Jones and Policeman wait in the strong room at the bank.
4. Watson looks at his watch it was 11.15 p.m.
2. Suddenly through the stone floor Spaulding comes out followed by Ross.
5. Holmes hits Spaulding’s arms and Ross quickly gets back into the tunnel.
1. Three men waiting at the other end of the tunnel caught Ross.
7. Spaulding says, “you think of everything, Mr. Holmes. You’re very clever”.
3. “So are you John Clay! Your Red-Headed League was clever” said Holmes

The Red – Headed League Summary

Mr. Wilson, a red-haired pawn-shop owner, met the famous detective Mr. Sherlock Holmes to find a solution for the practical joke someone had been playing on him.

Mr. Wilson joined the Red-Headed League headed by Mr. Duncan Ross for quite a high salary of four pounds a week, on the recommendation of his assistant Vincent Spaulding who worked with him for half the wages. Wilson’s work was to copy the Encyclopaedia Britannica daily from 10.00 a.m. to 2.00 a.m. After eight weeks he is shocked to find that the office has been dissolved.

Holmes and his friend Dr. Watson visit Mr. Wilsons shop at Saxe-Coburg Square. He walks in front of the shop and taps the ground with his walking stick. He knocks the shop door and Spaulding opens. The legs of his trousers are dirty. Holmes asked Spaulding the way to Strand, pretty well knowing it. Holmes asks Dr. Watson to meet him at ten o’clock.

Holmes, Dr.Watson and Mr. Jones and a policeman await for the thief at the bank. They hide themselves behind the boxes. At 11.15 p.m. Spaulding and Ross come from underground and are caught. Spaulding is recognized to be the notorious thief John Clay.

Later Holmes explains to Dr. Watson that the Red-Headed League was just created to keep Wilson away from his shop. When he went for work daily, they had time to make the tunnel Holmes doubted Spaulding as he worked for half wages and was in the cellar most of the time. When Holmes hit the ground with his walking stick and saw Spaulding’s trousers dirty, he understood that he is making a tunnel from the pawn-shop to the Bank at the back of the shop, in the next street. As the Red-Headed League was dissolved and it was Sunday, Holmes was sure the thieves would come and he caught them red handed. A huge bank robbery was cleverly stopped.

You can Download Samacheer Kalvi 7th Science Book Solutions Guide Pdf, Tamilnadu State Board help you to revise the complete Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th Science Solutions Term 2 Chapter 2 Electricity

Samacheer Kalvi 7th Science Electricity Textual Evaluation

I. Choose the correct answer:

Samacheer Kalvi 7th Science Guide Term 2 Question 1.
In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit ________.

(a) 10 A
(b) 1 A
(c) 10 V
(d) 1 V
Answer:
(a) 10 A

Electricity Book Back Answers Question 2.
In the circuit shown, which switches (L, M or N) must be closed to light up the

(a) switch L only
(b) switch M only
(c) Switch M and N only
(d) either switch L or switches M and N
Answer:
(d) either switch L or switches M and N

Samacheer Kalvi 7th Science Term 2 Question 3.
Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?
(a) 2.5 mA
(b) 25 mA
(c) 250 mA
(d) 2500 mA
Answer:
(c) 250 mA

Samacheer Kalvi 7th Science 2nd Term Question 4.
which of the following circuits are the bulb connected in series?

Answer:

II. Fill in the blanks

1. The direction of conventional current is ____________ to electron flow.
2. One unit of coulomb is charge of approximately ____________ protons or electrons.
3. ____________ is used to measure the electric current.
4. In conducting materials electrons are ____________
5. S.I. unit of Electrical conductivity of a conductor is ____________

Answers:

1. Opposite
2. 6.242×10
3. Ammeter
4. Loosely
5. siemens/meters

III. True or false – If false give Hie correct answer:

Samacheer Kalvi 7th Science Book Answers Term 2 Question 1.
Electron flow is in the same direction to conventional current flow.
Answer:
False.
Electron flow is in the opposite direction to conventional current flow.

7th Science Term 2 Question 2.
The fuse wire does not melts whenever there is overload in the wiring.
Answer:
False.
The fuse wire melts whenever there is overload in the wiring.

7th Standard Term 2 Science Question 3.
In a parallel circuit, the electric components are divided into branches.
Answer:
True.

Electricity Lesson 7th Class Question 4.
The representation of the electric current is A.
Answer:
False.The representation of the electric current is I.

7th Class Electricity Lesson Question 5.
The electrical conductivity of the semiconductor is in between a conductor and an insulator.
Answer:
True.

VI. Match the following :

1. Cell – used to open or close a circuit
2. Switch – safety device used in electric circuit
3. Circuit – A complete path for the flow of an electric current
4. Miniature circuit Breaker- Reset by hand, circuit becomes complete once again
5. Fuse – A device which converts chemical energy into electrical energy

Answer:

1. Cell – A device which converts chemical energy into electrical energy
2. Switch – used to open or close a circuit
3. Circuit – A complete path for the flow of an electric current
4. Miniature circuit Breaker – Reset by hand, circuit becomes complete once again
5. Fuse – safety device used in electric circuit

V.Analogy:

Samacheer Kalvi Guru 7th Science Term 2 Question 1.
Water : pipe : : Electric current: ______.
Answer:
wire

7th Class Science Electricity Lesson Question 2.
Copper : conductor : : Wood : ________.
Answer:
insulator

7th Standard 2nd Term 2nd Lesson Question 3.
Length : meter scale : : Current : ________.
Answer:
ammeter

Question 4.
milli ampere: micro ampere : : 10 – 3A: _______.
Answer:
10-6A

VI. Assertion and Reason :

Question 1.
Assertion (A) : Copper1 is used to make electric wires.
Reason (R) : Copper has very low electrical resistance.
Option:
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is NOT the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
E. Both A and R are false .
Answer:
A. Both A and R are true and R is the correct explanation of A

Question 2.
Assertion (A) : Insulators do not allow the flow of current through themselves. Reason (R) : They have no free charge carriers.
A. If both A and R are true and the R is correct explanation of A.
B. If both A and R are true but R is not a correct explanation of A.
C. If A is true and R is false.
D. If both A and R are false.
Answer:
A. If both A and R are true and the R is correct explanation of A

VII. Very short answer :

Question 1.
What is the speed of electric current?
Answer:
Current travels at the speed of 1/100th times the speed of light 0.0002 m/s.

Question 2.
What is the S.I unit of electrical conductivity?
Answer:
The SI unit of electrical conductivity is Siemens / metres (s/m).

Question 3.
Name the device used to generate electricity.
Answer:
Electric cell.

Question 4.
Define fuse.
Answer:
Electric fuse is a safety device which is used in household wiring and in many appliances.

Question 5.
Name some devices that run using heat effect of electric current
Answer:
Electric bulb, geyser, Iron box.

Question 6.
Name few insulators.
Answer:
Rubber, wood, plastic, glass.

Question 7.
What is a battery?
Answer:
Batteries are a collection of one or more cells whose chemical reactions create a flow of electrons in a circuit.

VIII. Short Answer :

Question 1.
Define an electric current.
Answer:
An electric current is measured by the amount of electric charge moving per unit time at any point in the circuit. The conventional symbol for current is I.

Question 2.
Differentiate parallel and serial circuits.
Answer:
Parallel circuits:

1. It is connected by branches.
2. Voltage remains the same across each component of the circuit
3. Each bulb is fully powered.
4. All bulbs stay lit if one goes out.

Serial circuits:

1. It consist of single loop connection.
2. Current remains same in all parts of the circuit.
3. All the bulbs share power.
4. All bulbs go out if one goes out.

Question 3.
Define electrical conductivity.
Answer:
Electrical conductivity or specific conductance is the measure of a material’s ability to conduct an electric current.

IX. Long Answer :

Question 1.
Explain flie construction and working of an Telephone.
Answer:
In telephones, a changing magnetic effect causes a thin sheet of metal (diaphragm) to vibrate. The diaphragm is made up a metal that can be attracted to magnets.

1. The diaphragm is attached to spring that is fixed to the earpiece.
2. When a current flows through the wires, the soft – iron bar becomes an electromagnet.
3. The diaphragm becomes attracted to the electromagnet.
4. As the person on the other end of the line speaks, his voice cause the current in the circuit to change. This causes the diaphragm in the earpiece to vibrate, producing sound.

Question 2.
Explain the heating effect of electric current
Answer:

1. When an electric current passes through a wire, the electrical energy is converted to heat.
2. In heating appliances, the heating element is made up of materials with high melting point. An example of such a material is nichrome (an alloy of nickel, iron and chromium).
3. The heating effect of electric current has many practical applications.
4. The electric bulb, geyser, iron box, immersible water heater are based on this effect.
5. These appliances have heating coils of high resistance.
6. Generation of heat due to electric current is known as the heating effect of electricity.

Question 3.
Explain the construction and working of a dry cell.
Answer:

1. A dry cell is a portable form of a leclanche cell.
2. It consists of zinc vessel which acts as a negative electrode or anode.
3. The vessel contains a moist paste of saw dust saturated with a solution of ammonium chloride an chloride.
4. The ammonium chloride acts as an electrolyte.
5. The purpose of zinc pide is to maintain the moistness of the paste being highly gyroscopic.
6. The carbon rod covered with a brass cap is placed in the middle of the vessel. It acts as positive electrode or cathode.
7. It is surrounded by a closely packed mixture of charcoal and manganese dioxide (Mn0₂) in a muslin bag.
8. Here Mn0₂ acts as depolarizer. The zinc vessel is sealed at the top with pitch or shellac.
9. A small hole is provided in it to allow the gases formed by the chemical action to escape.
10. The chemical action inside the cell is the same as in avalanche cell.

X. Higher Order Question:

A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder) and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight.

Question 1.
What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?
Answer:
The possible reasons so that even at switch ‘ON’ position the bulb is not glowing are:

1. The cell may be discharge
2. The bulb may be fused.
3. The wire may be broken from inside
4. The connection may be loose.

XI. Picture based Questions:

Question 1.
Three conductors are joined as shown in the diagram.
The current in conductor RS is 10 A. The current in conductor QR is 6 A. What will be the current in conductor PR

(a) 4A
(b) 6 A
(c) 10 A
(d) 16 A
Solution:
PR + OR = RS
PR + 6A = 10A
PR = 10A- 6A = 4A

Question 2.
Draw the circuit diagram for the following series connection.

Answer:

Question 3.
Study the electric circuit below. Which of the following switches should be closed so that only two bulbs will light up.

(a) SI, S2 and S4 only
(b) SI, S3 and S5 only
(c) S2, S3 and S4 only
(d) S2, S3 and S5 only
Answer:
(c) S2, S3 and S4 only

Question 4.
Study the three electric circuits below. Each of them has a glass rod (G), a steel rod (S), and a wooden rod (W).
In which of the electric circuits would the bulb not light up

(a) A only
(b) C only
(c) A and B only
(d) A, B and C
Answer:
(c) A and B only

Samacheer Kalvi 7th Science Electricity Intext Activities

Activity – 3

Question 1.
I am so exhausted. I am going to faint. What first aid will you give me to wake up?
Answer:

I will recharge immediately

Samacheer Kalvi 7th Science Electricity Additional Questions

I. Choose the correct answer.

Question 1.
An electric component used as a safety device is electric circuit is
(a) cell
(b) electric wires
(c) switch
(d) fuse
Answer:
(d) fuse

Question 2.
In an electric circuit, the current starts from
(a) the positive terminal of the battery
(b) the negative terminal of the battery
(c) either of the terminals of the battery
(d) none
Answer:
(a) the positive terminal of the battery

Question 3.
_______ was developed is 1887 by Yei Sakizo of Japan
(a) Alkaline cell
(b) Button cell
(c) Lead accumulator
(d) Dry cell
Answer:
(d) dry cell

Question 4.
________ cell is used to operate devices such as mobile phones, computers and emergency lights
(a) Primary cell Lithium cell
(b) Secondary cell
(c) Lithium Cell
(d) None
Answer:
(b) Secondary cell

Question 5.
A battery is a group of _______
(a) only two cells
(c) two or more cells
(b) only single cell
(d) all of these
Answer:
(c) two or more cells

Question 6.
Which of the following is an electrical conductor?
(a) cork
(b) wood
(c) plastic
(d) silver
Answer:
(d) silver

Question 7.
Which one of the following phenomenon occurs when two naked wires of electricity supply line touch other?
(a) Lightning
(b) Short circuiting
(c) Overloading
(d) none
Answer:
(b) Short circuiting

Question 8.
Magnetic effect of current was discovered by ____________
(a) Flemming
(b) John Dalton
(c) Newton
(d) Hans Christian Oersted
Answer:
(d) Hans Christian Oersted

Question 9.
Which of the following is the symbol for a bulb?

Answer:

Question 10.
Electricians wear rubbers gloves because it is ____________
(a) soft
(b) an insulator
(c) conductor
(d) water proof
Answer:
(b) an insulator

II. Fill in the Blanks.

1. ____________ is a common example of the practical application.
2. An insulator gives a lot of ____________ to the flow of charge (electron)
3. Wires made of ____________  an electrical conductor, have very low resistance.
4. The chip which are used in SIM cards and ATM cards are made up of ____________
5. ____________  are used to remove splinters of steel or iron in hospitals dealing with eye injuries.
6. Edison used a ____________ wire coil is a vacuum glass and discovered the first electric bulb in 1879.
7. ____________ cells cannot be recharged after use. x
8. The SI unit of potential difference is____________
9. The SI unit of resistance is____________
10. An electric charge always flows from a point____________ at to a point at____________

Answer:

1. Arc welding
2. resistance
3. copper
4. Semi conductors
5. Electromagnets
6. platinum
7. platinum
8. volt (V)
9. ohm
10. higher potential, lower potential

III. True or False – if false give the correct statement.

Question 1.
Insulators do not carry electric current because they do not have free electrons.
Answer:
True.

Question 2.
An MCB can be used instead of a fuse in an electrical circuit.
Answer:
True.

Question 3.
The flow of electric charge per unit time is called potential difference.
Answer:
False. The flow of electric charge per unit time is called current.

Question 4.
The source which produce the small amount of electricity for shorter period of time is called as electro chemical cell.
Answer:
True.

Question 5.
Electric cell converts electrical energy into chemical energy.
Answer:
False. Electric cell converts chemical energy into electrical energy.

Question 6.
The pipe is like the wire in the electric circuit and the pump is like the battery.
Answer:
True.

Question 7.
All batteries are made up of three components an anode, a cathode and some kind of electrolyte.
Answer:
True.

Question 8.
An insulator gives a less resistance to the flow of charge.
Answer:
False.An insulator gives a more resistance to the flow of charge.

Question 9.
Electric fuse has a body made of ceramic and two points for connecting the fuse wire.
Answer:
True

Question 10.
Chemical reaction happens, when electricity passes through various conducting liquids.
Answer:
True

IV. Match the following
Question 1.

1. 1 mA – (a) series
2. 1 pA – (b) ohm – metre
3. Ammeter – (c) 10-6 ampere
4. Electrical resistivity – (d) 10-3 ampere

Answer:

1. (d)
2. (c)
3. (a)
4. (b)

Question 2.

Answer:

1. (b)
2. (d)
3. (a)
4. (c)

Question 3.

1. Dry cells – (a) Reversible
2. Electrolyte – (b) Opens or closes the circuit
3. Switch – (c) Solution
4. Secondary cell – (d) Torches

Answer:

1. (d)
2. (c)
3. (b)
4. (a)

Question 4.

Answer:

1. (b)
2. (c)
3. (d)
4. (a)

V. Assertion and Reason.

Mark the correct choice as
(a) Both A and R are true but R is the correct explanation of A.
(b) Both A and R are true and R is the not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question 1.
Assertion (A) : Charges flow from higher potential to the lower potential.
Reason (R) : Current flows mainly due to flow of electrons.
Answer:
(b) Both A and R are true and R is the not the correct explanation of A

Question 2.
Assertion (A) : Insulators do not allow flow of current through them.
Reason (R) : Insulators have no free charge carrier.
Answer:
(a) Both A and R are true but R is the correct explanation of A

Question 3.
Assertion (A) : A current carrying wire should be charged.
Reason (R) : The current in a wire is due to flow of free electrons in a definite direction.
Answer:
(d) A is false but R is true

Question 4.
Assertion (A) : The connecting wires are made of copper.
Reason (R) : The electrical conductivity of copper is high.
Answer:
(a) Both A and R are true but R is the correct explanation of A

VI. Very short Answers:

Question 1.
What is the source of electric current in a T.V. remote?
Answer:
Electric cell.

Question 2.
In which position is key placed in a circuit?
Answer:
Key can be placed anywhere in the circuit.

Question 3.
What are the effects of electricity?
Answer:

1. Heating effect
2. Chemical effect
3. Magnetic effect

Question 4.
Name the instrument which is used to measure potential difference.
Answer:
Voltmeter.

Question 3.
Name the portable form of a avalanche cell.
Answer:
Dry cell.

Question 4.
Name the substance that become ions in solutions and acquire the capacity to conduct electricity.
Answer:
Electrolytes.

Question 7.
Name the component of a circuit which help us to start or stop the appliances & safely and easily.
Answer:
Switch.

Question 8.
Name the component which connects electrical components to one another.
Answer:
Wire.

VII. Short Answer.

Question 1.
What is resistance?
Answer:
Resistance is the property of an electrical component which resists the flow of electric charges, when it is connected is a circuit.

Question 2.
What are the uses of electromagnets?
Answer:
Electromagnets are used in cars, speakers, electric motors, electric cells, telephone receivers and television.

Question 3.
What is an electric fuse made up of?
Answer:
A fuse is a small place of wire of an alloy of low melting point (63% tin and 37% lead).

Question 4.
What do you mean by magnetic effect?
Answer:
When electric current passes through a wire, it behaves like a magnet. This is called
magnetic effect of electricity.

Question 5.
What are MCB’s? How do they work?
Answer:

1. MCB’s (Miniature Circuit Breakers) are switches which automatically turn off when current in a circuit exceeds the safe limit.
2. We turn them on and the circuit is once again complete.

Question 6.
What is heating effect of the electric current?
Answer:

1. The wire or component gets hot when an electric current passes through them,
2. This is known as heating effect of the electric current.

Question 7.
Define electric cell. What is the direction of electric current in a cell?
Answer:

1. The simplest sources of an electric current is an electric cell and it has a positive terminal and a negative terminal.
2. In electric cell the current starts from positive terminal of the cell, passes through the equipment connected to it, and terminates at the negative terminal of the cell.

Question 8.
What do you mean by an open circuit?
Answer:

An open circuit occurs when there is break in the circuit which stops the current from flowing. Breaks in the circuit can be due to many causes, such as loose bulb holder or a missing wire in the circuit.

Question 9.
Write the analogy between water current and electric current.
Answer:

1. Water molecules flow towards a point of lower elevation.
2. Electric charges flow towards a point of lower voltage.

Question 10.
What are the factors affecting heating effect of electric current?
Answer:

1. The amount of current I.
2. The resistance R and

VIII. Long Answer

Question 1.
Write the differences between primary cell and secondary cell.
Answer:
Primary cell:

1. The chemical reaction inside the primary cell is irreversible
2. It cannot be recharged.
3. Examples of secondary cells are lead accumulator, Edison accumulator and Nickel – Iron accumulator.
4. Examples- simple voltalic cell, Daniel cell, and lechlanche cell and dry cell

Secondary cell:

1. The chemical reaction inside the secondary cell is reversible.
2. It can be recharged.
3. It is used to operate devices such as mobile phones, cameras, computers, and emergency lights.
4. Examples of secondary cells are lead accumulator, Edison accumulator and Nickel – Iron accumulator.

Question 2.
Explain the working of an electric fuse.
Answer:

1. Electric fuse is a safety device which is used in household wing and in many appliances.
2. Electric fuse has a body made of ceramic and two points for connecting the wire.
3. The fuse wire melts whenever there is overload of the current in the wire.
4. This breaks the circuit and helps in preventing damage to costly appliances and to the wiring.
5. In electrical devices, a glass fuse is often used.
6. This is a small glass tube, in which lies the fuse wire.

Question 3.
Explain the following :

1. Semi – conductors
2. Short circuit.

Answer:
1. The chip which are used in SIM Cards, Computers, and ATM cards are made up of semiconductors namely, silicon and germanium because of their electrical conductivity lies between a conductor and an insulator.

2. A short circuit is simply a low resistance connection between two conductors supplying electrical power to any circuit. Arc welding is a common example of the practical application of the heating due to a short circuit.

Question 4.
Draw the following using symbols:

1. Open circuit
2. Closed circuit
3. Series circuit
4. Parallel circuit

Answer:
1. Open Circute:

2. Closed Circuit:

3. Series Circuit:

4. Parallel Circuit:

IX. Problems for practice:

Question 1.
If 50 coulomb of electric charge flows through a wire in five minutes, calculate the current in the wire?
Solution:
Charge q = 50 c
time t = 5 min × 60 s = 300 s
current I = \(\frac { q }{ t }\)
= \(\frac { 50 }{ 300 }\) = \(\frac { 5 }{ 30 }\) = 0.166A

Question 2.
If 5A current flows through a circuit, then convert the current is terms of micro ampere?
solution :
I = 5A
IA = 106 µA
5A = 5 × 106 µA
5A = 50,00,000 µA

Question 3.
If 3A current flows through a circuit, then convert the current in terms of milliampere.
solution:
I = 3A
1A = 103 mA
3A = 3 × 1000 mA
3A = 3000 mA

X. Creative questions: HOTS

Question 1.
What is the difference between fuse wire and a heating wire?
Answer:
The fuse wire has low melting point, whereas the heating wire has a high melting point. Fuse wire is made up of tin-lead alloy, whereas heating wire is made of constant. (Copper and nickel alloy)

Question 2.
Observe the circuit given:

1. Would any of the bulb glow when the switch is in the ‘OFF’ position?
   
2. What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

Answer:

1. No bulb will glow
2. All bulbs will glow simultaneously.

You can Download Samacheer Kalvi 7th Science Book Solutions Guide Pdf, Tamilnadu State Board help you to revise the complete Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th Science Solutions Term 2 Chapter 3 Changes Around Us

Samacheer Kalvi 7th Science Changes Around Us Textual Evaluation

I. Choose the best answer :

Changes Around Us Class 7 Question 1.
When a woolen yarn is knitted to get a sweater, the change can be classified as _________
(a) physical change
(b) chemical change
(c) endothermic change
(d) exothermic change
Answer:
(a) physical change

7th Class Science Changes Around Us Question 2.
_________ of the following are endothermic changes.
(a) Condensation and melting
(b) Condensation and freezing
(c) Evaporation and melting
(d) Evaporation and freezing
Answer:
(a) Condensation and melting

Changes Around Us Class 7 Pdf Question 3.
The chemical change is _______
(a) water to clouds
(b) growth of tree
(c) cow dung to bio-gas
(d) ice-cream to molten ice-cream
Answer:
(c) cow dung to bio-gas

Changes Around Us 7th Class Lesson Question 4.
_______ is an example of a periodic change
(a) Earthquake
(b) Formation of rainbow in sky
(c) Occurrence of tides in seas
(d) Showering of rain
Answer:
(a) Earthquake

Question 5.
_______ is not a chemical change.
(a) Dissolution of ammonia in water
(b) Dissolution of carbon-dioxide in water
(c) Dissolution of oxygen in water
(d) Melting of polar ice caps
Answer:
(b) Melting of polar ice-caps

II.Fill in the blanks :

1. Filling up a balloon with hot air is a _______ change.
2. Stretching gold coin into a ring is a _______ change.
3. Opening a gas cylinder knob converts _______ fuel into _______ fuel. This is an example of _______ change.
4. Spoiling of food is a _______ change.
5. Respiration is a _______ change.

Answer:

1. physical
2. physical
3. liquid, gaseous, chemical
4. chemical
5. exothermic chemical

III. True or False – If False give the correct answer :

Question 1.
Cutting of cloth is an example of a periodic change.
Answer:
False, Cutting of cloth is an example of a physical change.

Question 2.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
Answer:
False, Taking a glass of water and freezing it by placing it in the freezer is a physical change

Question 3.
A bean plant collecting sunlight and turning it into bean seeds is an example of physical and non-periodic change.
Answer:
False, A bean plant collecting sunlight and turning it into bean seeds is an example of chemical and non-periodic change.

Question 4.
If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.
Answer:
False, if the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a fossil change.

Question 5.
Tarnishing of silver is an example of endothermic change.
Answer:
False, Tarnishing of silver is an example of change.

IV. Match the following:

Answer:

V. Classify the following changes as physical and chemical changes:

Question 1.
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chapathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
Answer:

Physical changes

1. Bending a paper clip.
2. Pounding silver into thin plate.
3. Rolling a chapathi dough into thin wire.
4. Occurrence of a day and night.
5. Blinking of eyelids.
6. Occurrence of a thunderstorm.
7. Rotation of the earth.
8. Formation of eclipses.
9. Painting the grill.
10. A rough piece of wood is sanded and polished resulting in change in texture.
11. Dosa from the batter.

Chemical changes

1. Rusting of a iron
2. Eruption of volcano
3. Burning of matchstick.

VI Analogy:

Question 1.
Physical Change: Boiling::Chemical Change: ________
Answer:
Burning.

Question 2.
Wood to saw dust: _________ :: Wood to Ash: Chemical change
Answer:
Physical change.

Question 3.
Forest fire: ________ change::Change in period in a school: periodic change
Answer:
Non-periodic.

VII. Very short answer type question :

Question 1.
State two examples of periodic changes.
Answer:
Seasonal changes, motion of hands of a clock.

Question 2.
Mention any two exothermic reactions.
Answer:
Burning of magnesium ribbon and burning of a candle.

Question 3.
Cold milk is heated and it becomes hot. Which type of change it is?
Answer:
Reversible.

Question 4.
What type of change is artificial ripening of fruit?
Answer:
Irreversible chemical change.

Question 5.
What type of change is coloring of a paper?
Answer:
Physical change.

Question 6.
Growing of nails is a periodic change. Why?
Answer:
Growing of nail is a periodic change, because it occurs periodically at regular intervals.

Question 7.
What type of energy changes is associated when ice melts?
Answer:

1. Physical change
2. Endothermic (heat energy is absorbed)

VII. Short answer type question :

Question 1.
Distinguish physical and chemical changes.
Answer:
Physical changes:

1. No new substance is formed
2. Reversible
3. Change in physical properties like size, shape, state
4. Melting of ice, tearing of paper freezing, evaporation vaporization

Chemical changes:

1. New substance is formed
2. Irreversible
3. Change in properties of reactants and products
4. Burning of paper, photosynthesis, digestion of food, rusting of iron

Question 2.
How can a change occur in a substance?
Answer:
A change can occurs in a substance by an alteration in the properties such as colour, texture and the state of the substance since there is formation of a new substance.

Question 3.
Can you suggest a method to collect water from sea water?
Answer:
Evaporation.

Question 4.
Is solar eclipse a periodic change? Give your reason.
Answer:
Yes, solar eclipse is a periodic change as it occurs after a definite interval of time.

Question 5.
What is the difference between dissolution of sugar and burning of sugar ?
Answer:

Dissolution of sugar:

1. When sugar is dissolved in water it disappears. It we taste the solution, the sugar is still present in dissolved form.
2. If water is evaporated we get back the sugar.
3. So it is a physical and reversible change.

Burning of sugar:

1. Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar as the chemical bonds broke.
2. Energy is released in the form of smoke.
3. So, burning a sugar is a chemical change.

IX. Long answer type question :

Question 1.
Explain the following statement: Digestion is a chemical change.
Answer:

1. When we eat, our mouth physically break down food into small pieces.
2. Mechanical digestion occurs in the mouth, stomach and small intestine.
3. Food is chemically changed in digestion when new, smaller substances are formed.
4. Moreover, we will never be able to get back the raw material in the same form as it was before.
5. Digestion of food is a permanent change which is irreversible.

Question 2.
How the iron blade is fixed into a wooden handle in tools used to dig the soil?
Answer:

1. First the ring in the iron blade of spade is heated.
2. Heating of the blade leads to its expansion and thus the ring gets bigger.
3. This happens because metals always expand on heating.
4. The metal blade is then fitted easily into the wooden handle.
5. After this, cold water is usually poured on the iron blade which leads to the contraction of the expanded iron blade.
6. The spade can also be left to cool down, undisturbed so that it is firmly fixed, (vu) The blade is attached firmly to the wooden handle of a spade in this process.

X.Higher order Thinking questions :

Question 1.
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Answer:
No, it is not a chemical change. We just separated the skin of the banana and there is no change is its composition..

Question 2.
A very hot glass on putting in cold water cracks. What does this change indicate?
Answer:
When hot glass is cooled fast, the glass cools down unevenly and therefore cause the glass to crack because inside contracts while the outside remains expanded. Glass expands when hot and contracts when cold. It’s a physical but irreversible change.

Question 3.
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Answer:
Boiling of water is a physical change:

1. On boiling, water is converted into steam. If we cover the beaker with a lid, steam condenses back to water. So, boiling, of water is a physical change since only the physical state of water changes.

Boiling of egg is chemical change:

1. When egg is boiled, chemical nature of the egg changes. The properties of a boiled egg are totally different from the raw egg. Hence, boiling of an egg is a chemical change.

XI. Assertion – Reason type question :

Question 1.
Assertion (A) : The explosion of fire cracker is a physical change.
Reason (R) : A physical change is a reversible change.
Option:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Answer:
(d) A is false but R is true

Question 2.
Assertion (A) : e process of conversion of liquid water to its vapours by heat mg the liquid is called boiling.
Reason (R) :The process of conversion of water vapours to liquid by cooling the vapors is called condensation
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are 11 but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Answer:
(b) Both A and R are true but R is not the correct explanation Of A.’

Question 3.
Assertion (A) : Burning of wood log to charcoal is a physical change.
Reason (R) : The products formed of burning a piece of wood can be easily converted back to wood log.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Answer:
The correct answer is A Both A and R are false]

Question 4.
Assertion (A) : The formation of iron oxide from iron is a chemical change.
Reason (R) : For the rust to form from iron, it must be exposed to air and water.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false. .
(d) A is false but R is true.
Answer:
(a) Both A and R are true and R is the correct explanation of A.

XII. Picture based Questions:
Observe the picture and list down the changes that are accompanied in the picture.

Answer:
(a)Physical change
(b)Chemical change
(c) Exothermic

Question 2.
Observe the picture containing a kettle and note that it has salt water in it and answer the following questions.
(a) What is name of the process that is done to the kettle?
(b) What will happen to the content of the kettle?
(c) What kind of change is occurring on the cold surface of the metal plate?
(d) What can you say about the quality of water that is obtained in the beaker?

Answer:
(a) Boiling
(b) Water in the kettle gets converted into vapour
(c) Endothermic
(d) Water vapour converted into liquid (condensation)

Samacheer Kalvi 7th Science Changes Around Us Intext Activity

Activity – 3

Question 1.
Take two pans, one wide and another narrow. Fill hot water in both to the same depth. Keep them in open. Observe after one to two hours. The pan that is wide has cooled more than the narrow one. That is more the surface area; the rate of evaporation is more.

From this, can you guess why we unfurl the clothes while putting them to dry, rather than just drape them over the cloth line?
Answer:
Wet clothes dry faster when we unfurl (Spread) them because the rate of evaporation depends on the surface area. If the surface area will be more, rate of evaporation will be higher or more.

Activity – 7

Question 1.
Take a small piece of magnesium ribbon and clean it by rubbing its surface with a sand paper. Hold the magnesium ribbon at one end with a pair of tongs and bring its other end over the flame of a burner.

Answer:
Magnesium ribbon must be cleaned before burning. So that the layer of magnesium oxide can be removed in order to get the desired chemical reaction.
Magnesium ribbon burns in air with a dazzling flame and forms a white ash, I magnesium gets oxidised to magnesium oxide.

Activity- 9

Question 11.
Ask a student to stretch both hands, put a pinch of soap powder in one hand and a pinch of glucose in the other hand. Add a few drops of water to soap powder and ask how the student feels upon adding water. Now add a few drops of water to the glucose at the other hand. Now ask the student how he /she feels on adding water, What is the feeling when water is added to glucose?
Answer:
We feel cool.

Question 10.
What is the difference when water is added to soap powder and when water is added to glucose?
Answer:
When water is added to soap powder we feel hot. When water is added to glucose we feel cold.

Intext Questions.

Question 1.
Look at the following list. Identify the physical and chemical changes and fill in the given table.
(rusting of iron, digestion of food, boiling egg, rotting banana, mixing sand and water, chopping wood, crushing a can, mixtures of different coloured buttons, burning of wood)

Answer:
Physical changes:

1. Chopping wood
2. Mixing sand and water
3. Crushing a can
4. Mixtures of different coloured buttons

Chemical changes:

1. Rusting of iron
2. Digestion of food
3. Boiling egg
4. Rotting banana
5. Burning of wood

Question 2.
When food gets spoiled, it produces a foul smell. Shall we call this change as a chemical change?
Answer:
Yes, it is a chemical change.

Question 3.
Discuss and give your answer. You know that plant produce their food by a process called photosynthesis. Can we call photosynthesis a chemical change?
Answer:
Yes.

1. Photosynthesis is the process through which plants convert light energy into chemical energy. Here is the chemical reaction involved.
2. As we can see, water and carbon di oxide combine to form glucose and oxygen.
3. Since new chemical species are formed, photosynthesis is clearly a chemical change.

Samacheer Kalvi 7th Science Changes Around Us Additional Questions.

I. Choose the correct answer

Question 1.
The change of state of a substance from solid to liquid and liquid to gas is ____________
(a) physical change
(b) a chemical change
(c) combination of a physical and chemical changes
(d) none
Answer:
(a) physical change

Question 2.
Rusting of iron is ____________
(a) an irreversible chemical change
(b) a reversible chemical change
(c) an irreversible chemical change
(d) a reversible physical change
Answer:
(a) an irreversible chemical change

Question 3.
Keeping a stone in sunlight for few hours is ____________
(a) a physical change
(b) a chemical change
(c) neither physical nor a chemical change
(d) combination of physical and chemical changes
Answer:
(c) neither physical nor a chemical change

Question 4.
Beating an egg to make a cake is a ____________
(a) physical change
(b) reversible change
(c) chemical change
(d) change in state
Answer:
(c) chemical change

Question 5.
Large crystals of pure substances can be obtained from their solutions by the process of ____________
(a) sublimation
(b) evaporation
(c) melting
(d) crystallization
Answer:
(d) crystallization

Question 6.
Which of the following is not a physical change?
(a) crushing of a paper
(b) Burning of a paper
(c) making boat of a paper
(d) melting of butter
Answer:
(b) Burning of a paper

Question 7.
Cut vegetables turn brown when exposed to air, this is due to ____________
(a) evaporation
(b) oxidation
(c) neutralization
(d) displacement
Answer:
(b) oxidation

Question 8.
Which gas is produced when vinegar reacts with baking soda?
(a) Hydrogen
(b) carbondioxide
(c) carbon monoxide
(d) oxygen
Answer:
(b) carbondioxide

Question 9.
Vanaspathi is obtained from vegetable oils by addition of ____________ to the oils.
(a) oxygen
(b) hydrogen
(c) carbon di oxide
(d) nitrogen
Answer:
(b) hydrogen

Question 10.
The simplest method of preventing rusting of iron is to coat it with oil, grease or paint. The reason being ____________
Answer:
(a) this layer does not allow iron to come in contact with air.
(b) this layer does not allow iron to come in contact with water
(c) this layer does not allow iron to come in contact
(d) this layer does not allow iron to come in contact with air and water.
Answer:
(c) this layer does not allow iron to come in contact

II. Fill in the Blanks.

1. When water is added to _______ there will be evolution of heat along with the formation of slaked lime.
2. A lump of curd is the _______ that is obtained by the chemical reaction between hot milk and lemon juice.
3. Heat may evolved or absorbed during a _______ change.
4. Salt is obtained from sea water by the process of _______
5. When magnesium is burnt in air, a new substance is formed which is _______
6.  _______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
7.  _______ are substances that speed up the process of a chemical change and it will not under go any change during the course of the reaction.
8. Galvanisation is a process is which _______ is coated as a layer on iron.
9. The chemical formula of rust is _______.
10. _______ happens when molecules in a gas cool down.
11. Solid substances like_______ , _______ heating without becoming liquid.
12. Dissolution of glucose in water is an _______ Change
13. In an endothermic process, the speed of the molecules is _______ hence they move faster
14. _______ is the changing of a liquid into its solid state and it happens by cooling.
15. The rate of evaporation _______ with rising temperature.

Answer:

1. Quicklime
2. precipitate
3. chemical
4. evaporation
5. magnesium oxide
6. fermantation
7. catalysts
8. chromium or zinc
9. fe₂O₃.H₂O
10. condensation
11. camphor,naphthalene
12. endothermic
13. incresed
14. freezing
15. increses

III. True or False – if false give the correct statement.

Question 1.
Nitrogen gas turns lime water milky.
Answer:
False.
Carbondioxide gas turns lime water milky.

Question 2.
Cutting a log of wood into pieces is a chemical change.
Answer:
False.
Cutting a log of wood into pieces is a physical change.

Question 3.
Iron pipes coated with zinc do not get rusted easily.
Answer:
True.

Question 4.
Iron and rust are the same substances.
Answer:
False.
Rust is iron oxide.

Question 5.
The chemical name of baking soda is sodium bicarbonate.
Answer:
True.

Question 6.
Adding sugar to milk is a physical change.
Answer:
True.

Question 7.
Magnesium + oxygen → magnesium oxide.
2Mg + O₂ → 2Mg O
Answer:
True

Question 8.
Evaporation is a fast process and occurs only at the surface of the liquid.
Answer:
False. Evaporation is a slow process and occurs only at the surface of the liquid.

Question 9.
The rate of evaporation is more when the surface area is greater.
Answer:
True.

Question 10.
When lemon juice is mixed with soda water, they produce brisk effervescence
Answer:
true

IV. Match the following :
Question 1.

Answer:

1. (a)
2. (c)
3. (d)
4. (b)

Question 2.

Answer:

1. (c)
2. (d)
3. (a)
4. (b)

Question 3.

Answer:

1. (c)
2. (d)
3. (a)
4. (b)

IV. Very short Answers:

Question 1.
Mention few physical properties of a substance.
Answer:
Lustre, malleability, ductility, density, viscosity, solubility mass and volume.

Question 2.
What are crystals?
Answer:
Crystals are solids in their purest form that have definite geometrical shapes.

Question 3.
Is conversion of milk into ice-cream a chemical change?
Answer:
Yes, conversion of milk into ice-cream is a chemical change. Since properties of ice-cream are different from the milk

Question 4.
Which is used as a catalyst during the process of hydrogenation of oils?
Answer:
Nickel, platinum or palladium.

Question 5.
Mention some of the different conditions needed for chemical changes to occur.
Answer:
Physical contact of the substances, heat, light, electricity and pressure.

Question 6.
Write the chemical reaction of baking soda with lemon.
Answer:
Sodium hydrogen carbonate + citric acid → sodium citrate + carbon di oxide+ water.

Question 7.
Give examples for endothermic process.
Answer:
Melting, vaporization and sublimation.

Question 8.
Give examples for exothermic process.
Answer:
Freezing and condensation.

Question 9.
Write the equation for the process of formation of rust.
Answer:
Iron + oxygen + water → rust
2Fe + 2O₂ + 2H₂O →2Fe₂O₃.H₂O

Question 10.
What will happen when we mix baking soda with lemon juice?
Answer:
When we mix baking soda with lemon juice we can hear a hissing sound when bubbles of carbon di oxide coming out and rising is the reaction vessel.

VI. Short Answer.

Question 1.
How would you show that settling of curd is a chemical change?
Answer:
When milk is set to curd, the properties of milk are completely changed and a new product is formed. Curd cannot be converted back to milk, hence it is a chemical change.

Question 2.
Explain how painting of an iron gate prevents it from rusting.
Answer:
When an iron surface is painted, iron does not come in contact with air or moisture. Paint acts as a protective layer and prevents exposure of iron to the atmosphere. Since air and water are necessary for rusting, iron does not get rusted, if painted.

Question 3.
Give an example where heat, light and sound are produced during a chemical change.
Answer:
Burning of a fire cracker is accompanied by evolution of heat, light and sound.

Question 4.
Give an example of a physical change in which the colour of the substance changes.
Answer:
Heat a piece of iron wire on fire. After some time, it turns red in colour. On cooling it is again converted into its original colour.

Question 5.
Write five changes in the characteristics of a substance which can take place during a chemical change. .
Answer:

1. Change in colour
2. Change in physical state.
3. Evolution of gas
4. Absorption or evolution of heat
5. Formation of a precipitate

Question 6.
How can we prevent rusting?
Answer:
Iron articles can be prevented from making contact with oxygen, water/water vapour. A simple way is to apply a coat of paint or grease. These coats should be applied regularly to prevent rusting.

Question 7.
Write a note on catalyst.
Answer:
Catalysts are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction. For example, yeast acts as the catalyst in the fermentation of sugar.

Question 8.
We are advised to not to play with fireworks. Give reason.
Answer:
Explosion of a firework is a chemical change. This explosion produces heat,Tight, sound andampleasant gases that pollute the atmosphere.

Question 9.
The process of eveporation is not a good technic to seperate salt from a sea water give a reason
Answer:
The process of evaporation is not a good technique because the soluble impurites do not get removed in the process of evaporation.

Question 10.
Chemical changes are important is our day to day life. Give examples
Answer:

1. Medicines are prepared by carrying out a chain of chemical changes.
2. The materials such as plastics, soaps, detergents, perfumes, acids, bases, salts etc are all made by carrying out various types of chemical changes.

Question 11.
A puddle of water getting pooled around the glass of ice-cream or a glass of ice cubes. When it is kept in room temperature. Give reason.
Answer:
The ice kept in the beaker receives heat from the surrounding air, to melt and form water.

VII. Long Answers

Question 1.
Distinguish between the characteristics of solid, liquid and gas.
Answer:

Question 2.
We would have observed that the plate that covers the cooked food items have water droplets inside. Why? Explain.
Answer:

1. The water vapour emerges from the hot food and goes up.
2. The plate covering the food item is in relative less temperature than the hot food.
3. Thus the more energetic molecules loose energy once they touch the cooler plate.
4. As the molecules lose heat, they lose energy and slow down.
5. They move closer to other gas molecules.
6. Finally these molecules collect together to form a liquid.
7. Condensation happens when molecules in a gas cool down.

Question 3.
Write note on the following:

1. Curdling of milk
2. Fermentation

Answer:
(i) Curdling of milk: Curdling is a process in which liquid gradually turns into solid, forming clumps along the way. Take hot milk in a pan and add few drops of curd, in few minutes milk curdles forming lumpy solid masses. We can even add lemon extract to the hot milk to effect curdling immediately, but the taste and texture of the curd will not be the same as that of the curdling occurring in a few hours.

(ii) Fermentation: Fermentation is the process in which microorganisms such as yeast and certain bacteria break down sugar solution into alcohol and carbon-di-oxide. It is an irreversible process as the alcohol fosned cannot be turned back into sugar. Thus, fermentation is a chemical change.

Question 4.
Explain the characteristics of physical change with examples.
Answer:

(i) During a physical change, no new substances are formed. In a physical change,the chemical properties of a substance do not change. For example, when ice cube melts, water is formed. In this change, there is no new substance, but water is same both in ice and in water.

(ii) A physical change is usually temporary and reversible in nature. For example, when water is heated, water vapours are formed, once water vapours are cooled, water can be obtained again.

(iii) In a physical change, the chemical properties of a substance do not change. For example, when a piece of gold is melted, its chemical composition remains the same in the solid form and also in the liquid form.

(iv) In a physical change, the physical properties such as colour, shape and size of a substance may undergo a change.For example, cutting of vegetables and inflating a balloon are some examples of physical changes in which size and shape of a substance undergoes a change.

Question 5.
Write the characteristics of chemical change.
Answer:

1. Heat, light or any other radiation may be given off or absorbed.
2. Sound may be produced.
3. A change in smell may take place (or) a new smell may be given off.
4. A colour change may take place.
5. A gas may be formed.
6. Formation of precipitate

Question 6.
Explain about indicators of a chemical change with examples.
Answer:
(i) Take some broken pieces of egg shell in a test tube and add lemon juice to it. You could see bubbles of carbon-di-oxide evolving in the test tube. This is because of the chemical change between the two. Hence, we can say that evolution of bubbles serve as an indicator that of a chemical change.

(ii) When water is added to quicklime (calcium oxide) there will be evolution of lot of heat along with the formation of slaked lime (calciumhydroxide). This is a chemical change and it is indicated by the evolution of heat when the reaction sets in between quicklime and water.

(iii) Spoilage of food is a chemical change and it is indicated by the foul smell. So, change of odour is also an indicator of a chemical change.

(iv) When an iron nail is kept in water for a few days and taken out, the nail will become reddish brown in colour indicating that it has rusted. Rusting is a chemical change and it is indicated by a change in colour of the iron nail.

(v) A lump of curd is the precipitate that is obtained by the chemical reaction between hot milk and lemon juice. So, formation of precipitate is also an indication of a chemical change.

VII. Assertion – Reason type questions

Mark the correct choice as:

a. Both A and R are true and R is the correct explanation of A.
b. Both A and R are true but R is not the correct explanation of A.
c. A is true butR is false.
d. Both assertion and reason are false.

Question 1.
Assertion (A) : Burning of a candle is considered a physical as well as chemical change.
Reason (R)Melting of wax is a physical change melted wax turns into vapours and then bums which is a chemical change.
Answer:
(a) Both A and R are true and R is the correct explanation of A.

Question 2.
Assertion (A) : No-new substance is formed when water is heated to get steam.
Reason (R) :Conversion of water into steam is a physical change.
Answer:
(a) Both A and R are true and R is the correct explanation of A

Question 3.
Assertion (A) : Cutting of paper into very small pieces is an irreversible change.
Reason (R) : Physical changes are always reversible.
Answer:
(c) A is true but R is false

IX. Picture based Question:
Question 1.
Cut a fresh slice of potato, apple and brinjal and keep it away for sometime. What is the reason for the change of colour in these cases?

Answer:

1. Colour of the potato and brinjal remains the same when stored in water but there is a change in colour with the piece kept in air.
2. The slice of an apple acquires a brown colour if it is not consumed immediately.
3. This occurs mainly due to oxidation which is caused by oxygen from the air.
4. So, it is a chemical change.

Question 2.

Answer:

1. Meting
2. Condensation

X. Higher order Thinking questions (HOTS):

Question 1.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
Answer:

1. When water is frozen into ice, it is a physical change. It is reversible since ice can be converted to water again.
2. When a piece of wood is cut into very small pieces, it is a physical change. It is reversible since small pieces of wood cannot be converted back to the bigger piece of wood.
3. It shows that physical changes can be reversible as well as irreversible.

Question 2.
Photosynthesis is a chemical charge. Justify your answer.
Answer:

1. Photosynthesis is the process through which plants convert light energy into chemical energy. Here is the chemical reaction involved.
2. As we can see, water and carbon di oxide combine to form glucose and oxygen,
3. Since new chemical species are formed, photosynthesis is clearly a chemical change.

Question 3.
Why is spoiling of food a chemical change?
Answer:

1. Spoiling of food is a chemical change as it involves the breakdown of the food particles by the microbes.
2. When the food gets spoiled certain properties of that food is loosed and some are gained, as there is a new change happening it is a chemical change.
3. Spoilage of food is indicates by the foul-smell. So change of odour is an indicator of a chemical change.

Students can Download Tamil Chapter 1.1 கலங்கரை விளக்கம் Questions and Answers, Summary, Notes Pdf, Samacheer Kalvi 7th Tamil Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th Tamil Solutions Term 2 Chapter 1.1 கலங்கரை விளக்கம்

மதிப்பீடு

சரியான விடையைத் தேர்ந்தெடுத்து எழுதுக.
Question 1.
வேயாமாடம் எனப்படுவது ………..
அ) வைக்கோலால் வேயப்படுவது
ஆ) சாந்தினால் பூசப்படுவது
இ) ஓலையால் வேயப்படுவது
ஈ) துணியால் மூடப்படுவது
Answer:
ஆ) சாந்தினால் பூசப்படுவது

Question 2.
உரவுநீர் அழுவம் – இத்தொடரில் அடிக்கோடிட்ட சொல்லின் பொருள்
அ) காற்று
ஆ) வானம்
இ) கடல்
ஈ) மலை
Answer:
இ) கடல்

Question 3.
கடலில் துறை அறியாமல் கலங்குவன …….
அ) மீன்கள்
ஆ) மரக்கலங்கள்
இ) தூண்க ள்
ஈ) மாடங்கள்
Answer:
ஆ) மரக்கலங்கள்

Question 4.
தூண் என்னும் பொருள் தரும் சொல் …..
அ) ஞெகிழி
ஆ) சென்னி
இ) ஏணி
ஈ) மதலை
Answer:
ஈ) மதலை

குறுவினா

Question 1.
மரக்கலங்களைத் துறை நோக்கி அழைப்பது எது?
Answer:

• மரக்கலங்களைத் துறை நோக்கி அழைப்பது கலங்கரை விளக்கம்.
• கடலில் துறை அறியாமல் கலங்கும் மரக்கலங்களைத் தன்னை நோக்கி கலங்கரை விளக்கம் அழைப்பதாகக் கடியலூர் உருத்திரங்கண்ணனார் தம் பாடலில் அழகாக சிறப்பித்துக் கூறுகிறார்.

Question 2.
கலங்கரை விளக்கில் எந்நேரத்தில் விளக்கு ஏற்றப்படும்?
Answer:
கலங்கரை விளக்கில் இரவு நேரத்தில் விளக்கு ஏற்றப்படும்.

சிறுவினா

கலங்கரை விளக்கம் பற்றிப் பெரும்பாணாற்றுப்படை கூறும் கருத்துகளை எழுதுக.
Answer:

• கலங்கரை விளக்கமானது வானம் கீழே விழாமல் தாங்கிப் பிடிக்கும் தூண் போலத் தோற்றமளிக்கிறது.
• ஏணி கொண்டு ஏற முடியாத அளவிற்கு உயரமாக உள்ளது.
• திண்மையான அதாவது திடமான கலவைச் சாந்து கொண்டு பூசப்பட்ட வானத்தை முட்டும் மாடத்தை உடையது.
• இந்த கலங்கரை விளக்கத்தில் இரவில் ஏற்றப்பட்ட எரியும் விளக்கு , திசை தெரியாமல் தவிக்கும் மரக்கலங்களைத் தன் துறை நோக்கி அழைப்பதாக புலவர்தம் பாடலில் குறிப்பிட்டுள்ளார்.

சிந்தனை வினா

கலங்கரை விளக்கம் கப்பல் ஓட்டிகளைத் தவிர வேறு யாருக்கெல்லாம் பயன்படும் என நீங்கள் கருதுகிறீர்கள்?
Answer:

• கடலில் சென்று மீன் பிடிக்கும் மீனவர்கள் மீன் பிடித்து திரும்பவும் கரை சேரவும் இக்கலங்கரை விளக்கம் பெரிதும் துணை புரிகின்றது.
• கடற்பயணம் சென்று கரை திரும்பும் பயணிகளுக்கு இக்கலங்கரை விளக்கம் சிறந்த வழிகாட்டியாக விளங்குகிறது.

கற்பவை கற்றபின்

Question 1.

கடற்கரைக்குச் சென்று அங்குள்ள காட்சிகளைக் கண்டு மகிழ்க.
Answer:

• நம்முடைய விடுமுறையை மகிழ்ச்சியாக கழிப்பதற்காகத் தேர்ந்தெடுக்கும் ஒரு முக்கிய இடம் கடற்கரை.
• பல இயற்கைச் சூழல்கள் கலந்த நம்முடைய நாட்டில் பல மாநிலங்கள் கடற்கரையோடு ஒட்டியுள்ளன.

மெரினா கடற்கரை :

• தமிழ்நாட்டின் தலைநகரான சென்னையில் அமைந்துள்ள மெரினா கடற்கரை உலகின் நீளமான கடற்கரைகளில் ஒன்றாகும். இதன் நீளம் 13 கிலோ மீட்டராகும்.
• தமிழகக் கடற்கரைகளிலேயே எல்லா நாள்களிலும் அதிக அளவு மக்கள் கூடும் கடற்கரையாக மெரினா கடற்கரை உள்ளது.
• இதன் அருகில் அண்ணா நினைவிடம், எம்.ஜி.ஆர் நினைவிடம், ஜெயலலிதா நினைவிடம், கலைஞர் கருணாநிதி நினைவிடம் ஆகியவை உள்ளன.

கன்னியாகுமரி கடற்கரை :

• இந்தியாவின் தென்கோடியில் உள்ள கன்னியாகுமரியில் இந்தக் கடற்கரை அமைந்துள்ளது.
• உள்ளூர் மட்டுமல்லாது உலகிலுள்ள வெளிநாட்டுப் பயணிகளும் வந்து செல்லும் கடற்கரை இது.
• இங்கு வங்காள விரிகுடா, அரபிக்கடல், இந்தியப் பெருங்கடல் இணையும் முக்கடல் சங்கமம் உள்ளது.
• கடலுக்குள் பாறையில் அமைந்திருக்கும் விவேகானந்தர் சிலை மற்றும் 133 அடி 6 உயரத்தில் அமைந்துள்ள திருவள்ளுவர் சிலை ஆகியவை மிகவும் புகழ்பெற்றவை.
• இங்கு சூரிய உதயத்தையும், சூரிய அஸ்தமனத்தையும் காண தினமும் ஆயிரக்கணக்கானவர்கள் வருகின்றனர்.

Question 2.
‘கலங்கரை விளக்கம்’ – மாதிரி ஒன்று செய்து வருக.
Answer:
மாணவர்கள் தாங்களாகவே செய்ய வேண்டியவை.

Question 3.
கடலும் கலங்கரை விளக்கமும் – ஓவியம் வரைந்து வண்ண ம் தீட்டுக.
Answer:

கூடுதல் வினாக்கள்

சொல்லும் பொருளும் :

1. மதலை – தூண்
2. சென்னி – உச்சி
3. ஞெகிழி – தீச்சுடர்
4. உரவுநீர் – பெருநீர்ப் பரப்பு
5. அழுவம் – கடல்
6. கரையும் – அழைக்கும்
7. வேயா மாடம் – வைக்கோல் போன்றவற்றால் வேயப்படாது. திண்மையாகச் சாந்து பூசப்பட்ட மாடம்

சரியான விடையைத் தேர்ந்தெடுத்து எழுதுக.

Question 1.
‘மதலை’ என்னும் சொல்லுக்குப் பொருள் ………….
அ) தூண்
ஆ) உச்சி
இ) தீச்சுடர்
ஈ) கடல்
Answer:
அ) தூண்

Question 2.
‘ஞெகிழி’ என்னும் சொல்லுக்குப் பொருள்.
அ) தீச்சுடர்
ஆ) பெருநீர்ப் பரப்பு
இ) உச்சி
ஈ) அழைக்கும்
Answer:
அ) தீச்சுடர்

Question 3.
‘அழுவம்’ என்னும் சொல்லுக்குப் பொருள் ……..
அ) அழைக்கும்
ஆ) தூண்
இ) கடல்
ஈ) தீச்சுடர்
Answer:
இ) கடல்

Question 4.
‘சென்னி’ என்னும் சொல்லுக்குப் பொருள் …………
அ) உச்சி
ஆ) தீச்சுடர்
இ) அழைக்கும்
ஈ) கடல்
Answer:
அ) உச்சி]

Question 5.
‘உரவுநீர்’ என்னும் சொல்லுக்குப் பொருள்
அ) பெருநீர்ப் பரப்பு
ஆ) தீச்சுடர்
இ) உச்சி
ஈ) தூண்
Answer:
அ) பெருநீர்ப் பரப்பு

Question 6.
‘கரையும்’ என்னும் சொல்லுக்குப் பொருள் ………
அ) அழைக்கும்
ஆ) கடல்
இ) தீச்சுடர்
ஈ) உச்சி
Answer:
அ) அழைக்கும்

விடையளி:

Question 1.
கலங்கரை விளக்கம் என்றால் என்ன?
Answer:

• தமிழர் தம்முடைய மதிநுட்பத்தால் தொழில்நுட்ப அறிவினைக் கொண்டு கலம் படைத்து அதாவது, முதலில் படகைத் தயாரித்தனர். படிப்படியாக பாய்மரக்கப்பல், கப்பல் ஆகியவற்றை உருவாக்கினர்.
• படகுகளைக் கொண்டு மீன் பிடித்தும் வணிகம் செய்தும் வாழ்ந்து வந்தனர்.
• கடற்பயணம் சென்று கரை திரும்புவதற்குத் தமிழர் கண்ட தொழில்நுட்பமே கலங்கரை விளக்கமாகும்.

Question 2.
பத்துப்பாட்டு நூல்களைப் பட்டியலிடுக.
Answer:

•  திருமுருகாற்றுப்படை
• பொருநராற்றுப்படை
• பெரும்பாணாற்றுப்படை
• சிறுபாணாற்றுப்படை
• முல்லைப்பாட்டு
• மதுரைக்காஞ்சி
• நெடுநல்வாடை
• குறிஞ்சிப்பாட்டு
• பட்டினப்பாலை
• மலைபடுகடாம்

Question 3.
பெரும்பாணாற்றுப்படையின் நூலாசிரியர் பெயர் என்ன?
Answer:
பெரும்பாணாற்றுப்படையின் நூலாசிரியர் கடியலூர் உருத்திரங்கண்ணனார்.

Question 4.
கடியலூர் உருத்திரங்கண்ண னார் சங்கப் புலவரா?
Answer:
ஆம். இவர் சங்கப் புலவர்தான். இவர் கடியலூர் என்ற ஊரில் வாழ்ந்தவர்.

Question 5.
கடியலூர் உருத்திரங்கண்ணனார் இயற்றிய நூல்கள் யாவை?
Answer:

• பெரும்பாணாற்றுப்படை
• பட்டினப்பாலை

Question 6.
பெரும்பாணாற்றுப்படையின் பாட்டுடைத் தலைவன் பெயர் என்ன?
Answer:
தொண்டைமான் இளந்திரையன்.

Question 7.
ஆற்றுப்படை என்றால் என்ன?
Answer:
வள்ளல் ஒருவரிடம் பரிசு பெற்றுத் திரும்பும் புலவர், பாணர் போன்றோர் அந்த வள்ளலிடம் சென்று பரிசு பெற, பிறருக்கு வழிகாட்டுவதாகப் பாடப்படுவது ஆற்றுப்படையாகும்.

Question 8.
பத்துப்பாட்டில் இடம் பெறும் ஆற்றுப்படை நூல்களைப் பட்டியலிடுக.
Answer:

• திருமுருகாற்றுப்படை
• பொருநராற்றுப்படை
• பெரும்பாணாற்றுப்படை
• சிறுபாணாற்றுப்படை

பாடலின் பொருள்

கலங்கரை விளக்கமானது வானம் கீழே விழுந்துவிடாமல் தாங்கிக் கொண்டிருக்கும் தூண் போலத் தோற்றமளிக்கிறது; ஏணி கொண்டு ஏறமுடியாத உயரத்தைக் கொண்டிருக்கிறது; வேயப்படாமல் சாந்து பூசப்பட்ட விண்ணை முட்டும் மாடத்தை உடையது. அம்மாடத்தில் இரவில் ஏற்றப்பட்ட எரியும் விளக்கு, கடலில் துறை அறியாமல் கலங்கும் மரக்கலங்களைத் தன் துறை நோக்கி அழைக்கிறது.

Students can Download English Lesson 1 Alice in Wonderland Questions and Answers, Summary, Notes Pdf, Activity, Samacheer Kalvi 7th English Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th English Solutions Term 2 Supplementary Chapter 1 Alice in Wonderland

Read And Understand

A. Identify the character / speaker.

1. I must find out why he’s in such a hurry!
2. Go to my cottage and fetch my gloves and fan.
3. Oh no, I’ll never get back to the right size.
4. One side makes you big, the other side makes you small.
5. I’ll see you later at the Queen’s croquet game.
6. You may stay if you answer my riddle.
7. Wake up. You’ve been sleeping for too long.
Answer:
Alice
White Rabbit
Alice
Green Caterpillar
Cheshire Cat
Mad Hatter
Alice’s sister

B. Discuss and Answer.

Alice In Wonderland Book Back Answers Question 1.
Why did Alice follow the rabbit?
Answer
Alice saw a rabbit hurrying down a rabbit’s hole. She wanted to find out why the rabbit was in such a hurry. So she followed him.

Alice In Wonderland Questions And Answers Pdf Question 2.
Do you think this was a good idea?
Answer:
No, it was not a good idea.

Alice In Wonderland 7th Standard Book Question 3.
Why can’t Alice get through the little door into the garden?
Answer:
She couldn’t get into the garden through the little door because she was too big.

Alice In Wonderland 7th Standard Question 4.
Why does Alice drink from the bottle that says ‘DRINK ME’ and why does she eat from the cake that says ‘EAT ME’?
Answer:
Out of curiosity, Alice drank from the bottle that said ‘DRINK Me’. As she was hungry, she ate the cake that said ‘EAT ME’.

Alice In Wonderland Questions And Answers Question 5.
How does Alice feel after all these changes?
Answer:
She felt strange and realized that she would never get back to the right size.

7th Standard Alice In Wonderland Question 6.
What do you think is going to happen next?
Answer:
She may shrink again, after eating or touching anything.

C. Think and Answer.

Alice In Wonderland Supplementary 7th Standard Question 1.
What challenges does Alice face and how does she overcome them?
Answer:
Alice goes through a variety of strange physical changes. The discomfort she feels at never being the right size acts as a symbol for the changes that occur during her adolescence. She continually finds herself in a situation in which she risks death. She gets in trouble because of her curiosity. As Alice progresses through her dream, she loses her sense of identity. At. the beginning of her journey, she was confused, anxious and timid. Finally, she becomes a strong and confident girl, who is able to stand up for her.

Alice In Wonderland Question Answer Question 2.
Have you ever had a strange dream? Share your dream in the class.
Answer:
Yes, I had a strange dream last night. I went to bed late and was fast asleep. Suddenly, I felt that I was in a fairyland. There was a big garden. The flowers were blooming. The fairies were singing beautiful songs. One fairy came to me and offered me a small chair to sit on and enjoy the song. There I saw a little child playing on the flute. He arrived in the midst of the fairies. Some dwarfs and elves were sitting nearby. The child brought fruits for me. Everyone was dancing and singing happily. It was a pleasant and strange sight for me. Suddenly, I could hear my mother shouting at me to get up and to get ready to go to school. I woke up and was surprised to realize that it was only a pleasant and a strange dream.

D. Role play
Put students in pairs to role play a conversation between:

• Alice and her sister.
• Alice and White Rabbit

Alice and her sister.
Answer:
Alice : it Alice and White Rabbit.
Sister : Alice and her sister
Alice : What are you doing?
Sister : I am reading a book.
Alice : Let me see the book.
Sister : Here it is.
Alice : Are you reading a book without pictures or conversations in it?
Sister : Yes, I love to read these books.
Alice : What is the use of reading such a book? It is boring to read.
Sister : If it is boring for you, Please stay away from me.
Alice : This hot day makes me feel sleepy. Let me have a nap.

Alice and White Rabbit

Rabbit : Let me check the time. Oh my God. It’s late. I have to hurry.
Alice : Why are you in such a hurry?
Rabbit : I need to hurry for an important work.
Alice : Stop! Don’t run. I will chase you wherever you go.
Rabbit : I will go into my hole. You cannot enter it.
Alice : Why can’t I enter into the hole?
Rabbit : You are too big to enter into this hole.
Alice : Then what should I do?
Rabbit : You have to drink the little bottle on top of the table.
Alice : Oh Yes. I have shrunk in size after drinking from the bottle.
Rabbit : (Mistaking Alice for his maid). Go to my cottage and fetch my gloves and fan.
Alice : (confused) May be I’ll find something at the cottage to help me find my way out. I am hopeful.

E. Activity

It’s fun to help out in the kitchen. You can even practise reading aloud when reading the recipe. And you can learn a little math by figuring out how to measure. Here are a few fun items to make that are “Alice” themed.

Activity to be done by the Students.

F. Learning About Nature

Learn about caterpillars and.butterflies. Read a book about a caterpillar turning into a butterfly. You can get one from the library or go online and find information with pictures.

Students individual work.
Read a book about Caterpillars and Butterfly

Connecting to self

G. Tackling the issues

Ask the class to discuss solutions to an issue that plagues contemporary society at large or just your community for example, homelessness, violence, environmental degradation, hunger.
Half the class should mention idealistic solutions to the chosen issue; the Other half should mention only realistic approaches to solving the problem.
See if, in listening to both sides, someone can come up with a proposal that is both realistic and unconventional an idea that hasn’t been tried yet.
Answer:
Homelessness – Idealistic Solutions

Student No. 1 :
A permanent and sustainable end to homelessness requires four essential components.
1. Housing is the essential foundation to ending homelessness.
2. Housing is essential, but it is not sufficient. Housing alone, without attention to health, behavioural health, employment and education will continue to result in instability and recurrent homelessness for many people.

Student No. 2 :
1. A key to an apartment is great. But we have to stay connected with the society. Staying lonely in an apartment is not advisable.
2.People should be aware of new home loan plans and housing

Student No. 3 :
Proposal that is both realistic and unconventional:
We can end the homelessness crisis by stabilizing people through shelter, moving them into permanent housing and implementing assistance programs to keep them in their housing. Only then we can reduce and eliminate homelessness in India.

PROJECT
H. Imagine you are a marketing executive for a company in a specific industry (toothpaste, soup, hair care products, automobiles, etc) and are developing a product with a brand name that refers to a character from the story.

For example: You want to sell bandages that have little pictures of Don Quixote on them. Your company’s name is Kure-All and you decide to call them “Kure-All Quixote Bandages”.
The slogan might be: “Had a tough day with windmills? When you take a fall, use Kure-All.”
You can use exciting words, a catchy new slogan, and a jingle, among other things, to promote sales of your item.
Answer:
Marketing Products
1. “Are you tired chasing the rabbit for a long time?” Feel energetic, after a chase. Have “Alice Soup” for refreshment”.
2. “Cool your body with Cheshire hair oil and feel fresh”.
3. Want to reach your destination quickly? Go for “Lae March Hare Cars”.

Step To Success

J. Look at the number pattern. Fill the blank in the middle of the series or end of the series.

7th English Alice In Wonderland Question 1.
SCD,TEF,UGH,______,WKL
A) CMN
B) UJI
C) VIJ
D) IJT
Answer:
(C) VIJ

7th Standard English Alice In Wonderland Question 2.
FAG. GAF. HAL IAH,______,
A) JAK
B) HAL
C) HAK
D) JAI
Answer:
(A) JAK

Alice In Wonderland In Tamil 7th Standard Question 3.
F.T.FA. GT.HA. TLTA,______,MLNA
A) OLPA
B) KLMA
C) LLMA
D) KLLA
Answer:
(D) KLLA

Alice In Wonderland Answer Key Question 4.
CMM. F.OO. GOO,______,KUU
A) GRR
B) GSS
C) ISS
D) ITT
Answer:
(C) ISS

7th English Book Alice In Wonderland Question 5.
OPO. NML. KTI,______,EDC
A) HGF
B) CAB
C) JKL
D) GHI
Answer:
(A) HGF

Alice in Wonderland Additional Questions

I. Choose the Correct Answers (MCQ).

Question 1.
Alice was beginning to get_____
(a) upset
(b) tired
(c) irritated
(d) bored
Answer:
(b) tired

Question 2.
The hot day made her feel very ______ and stupid.
(a) sleepy
(b) frustrated
(c) calm
(d) active
Answer:
(a) sleepy

Question 3.
The Rabbit pulled a ______ out of his pocket.
(a) Twig
(b) brush
(c) watch
(d) paper
Answer:
(c) watch

Question 4.
There was nothing on it except a tiny ______ Key
(a) golden
(b) silver
(c) round
(d) iron
Answer:
(a) golden

Question 5.
She opened the door and saw a beautiful ______
(a) sight
(b) room
(c) garden
(d) paper
Answer:
(c) garden

II. dentify the Character / Speaker.

1. “Why, I’m no bigger than the insects that crawl on these flowers.
2. “Get out of my way! You’re blocking the door!”.
3. “I want to be big again”.
4. “There isn’t any”.
5. “Why is a raven like a writing desk?”

Answer:

1. Alice
2. The White Rabbit
3. Alice
4. March Hare
5. Mad Hatter

III. Write True or False against each statement.

1. Out of curiosity, Alice followed the rabbit.
2. Alice was unhappy with her tiny size at first
3. The magical toy made her small again.
4. Alice grew to her normal size after eating the mushroom.
5. The Dormouse smiled at Alice while the Cheshire cat was sleeping.

Answer:

1. True
2. False
3. False
4. True
5. False

IV. Very Short Questions with Answers.

Question 1.
Why was Alice tired of sitting by her sister?
Answer:
Alice was doing nothing, as her sister was reading a book.

Question 2.
Why did the rabbit pull out a watch out of his pocket?
Answer:
The rabbit did so to check the time.

Question 3.
What did Alice do at the rabbit’s hole?
Answer:
Alice ran to the rabbit’s hole and peeped through the entrance.

Question 4.
What was there on a three-legged table?
Answer:
There was a tiny golden key on it.

Question 5.
What was the green Caterpillar wearing?
Answer:
The green Caterpillar was wearing a pink jacket.

Question 6.
What did the Cheshire cat tell Alice before disappearing?
Answer:
The Cheshire cat told him that it would see Alice later at the Queen’s croquet game.

Question 7.
What were March Hare and Mad Hatter having?
Answer:
The March Hare and Mad Hatter were having tea.

Question 8.
Where was the Dormouse sitting?
Answer:
The Dormouse was sitting between March Hare and Mad Hatter.

Question 9.
Did Alice solve the riddle?
Answer:
Alice did not solve the riddle.

Question 10.
Why did the trumpet sound?
Answer:
The trumpet sounded in a distance calling the court to session

V. Short Questions with Answers.

Question 1.
What did Alice think of doing when she got bored?
Answer:
She thought that it was a pleasure to make a daisy-chain by getting up and picking the daisies fallen on the ground.

Question 2.
Describe the green Caterpillar.
Answer:
The green Caterpillar was dressed in a pink jacket. He was sitting on the top of a large mushroom, smoking a bubble pipe.

Question 3.
What did a gardener do?
Answer:
One gardener had planted white roses by mistake. He then painted them red, as the Queen hated white roses.

VI. Paragraph Questions with Answers.

Question 1.
What happened to Alice, when she drank from the bottle?
Answer:
Alice finds a tiny key and fits it into the tiny lock of a 15 inch high door. She peers inside and sees a beautiful garden. She wishes she could get through it. But even her head was too big. She then notices a bottle with a printed label that reads ‘Drink me’. She drinks the liquid from the bottle. She realizes that she is shrinking
down. She shrinks down to 10 inches high. She feels happy because she will be able to reach the garden. She is soon reassured that she will not shrink anymore, as she was a bit worried that she could keep shrinking down.

Question 2.
What is the most important literary element and message in ‘Alice in Wonderland’?
Answer:
The most important literary element in ‘Alice in Wonderland’ is fantasy. The message conveyed in this story for children is about the value of questioning our identity. One can question one’s identity at any age, but Alice in particular, questions her identity throughout the story, which marks her transition from childhood to adulthood. It is symbolized by her physical changes in size and shape. As we read the story, we can even see Alice reflecting on how different she was before her adventure began.

VII. Rearrange the following sentences in coherent order.

1. The Dormouse slept and the Cheshire cat smiled at her.
2. “And now you must be punished. Off with her head” yelled the Queen
3. “What’s going on?” asked Alice.
4. “Court is now in session” announced the white rabbit.
5. “How silly”, replied Alice. ‘I did not have the slightest idea what you were talking about. I was only playing croquet.
6. “You are guilty of stealing the delicious heart-shaped tarts” accused the Queen.
7. Everyone rushed into the courtroom.
8. “Will Alice please come to the stand?”
9. Alice felt someone touch her shoulder, ‘wake up’.
10. Alice took the stand and looked at the jury box, where March Hare and the Mad Hatter were making noise.
Answer:
7, 4, 8,10,1, 3, 6, 2, 5, 9.
7. Everyone rushed into the courtroom.
4. “Court is now in session” announced the white rabbit.
8. “Will Alice please come to the stand?”
10. Alice took the stand and looked at the jury box, where March Hare and the Mad Hatter were making noise.
1. The Dormouse slept and the Cheshire cat smiled at her.
3. “What’s going on?” asked Alice.
6. “Your are guilty of stealing the delicious heart-shaped tarts” accused the Queen.
2. “And now you must be punished. Off with her head” yelled the Queen.
5. “How silly”, replied Alice. ‘I did not have the slightest idea what you were talking about. I was only playing croquet.
9. Alice felt someone touch her shoulder, ‘wake up’.

VIII. Read the passage and answer the questions.

A.
When she turned around towards the three-legged table, Alice found a green bottle that said ’ “DRINK ME” magically appeared on it. Out of curiosity, Alice took the bottle and drunk the
entire potion. Then, she began to shrink until she was no bigger than a doll.

Question 1.
What did Alice find on the three legged table?
Answer:
She found a green bottle that said, “DRINK ME”.

Question 2.
Why did Alice take the bottle?
Answer:
Alice took the bottle because she was curious to know about it.

Question 3.
What happened to her, when she drank the entire potion in it?
Answer:
She began to shrink, until she was no bigger than a doll.

B.
There was a table set out under a tree in front of the house, and the March Hare and the Hatter were having tea at it: A Dormouse was sitting between them, fast asleep, and the other two were using it as a cushion, resting their elbows on it, and talking over its head.

Question 1.
What was there in front of the house?
Answer:
There was a table set under a tree in front of the house.

Question 2.
Where was the Dormouse sitting? What was it doing?
Answer:
Dormouse was sitting between Mad Hatter and March Hare. It was fast asleep.

Question 3.
What were Mad Hatter and March Hare doing?
Answer:
They were resting their elbows on the Dormouse, talking over its head and having tea.

C.
Alice felt someone touch her shoulder, “Wake up. You’ve been sleeping for too long,” said her sister softly. “I had a strange dream,” said Alice. She told her sister about the White Rabbit, the mad tea party, the Queen of Hearts and the trial. But her sister wasn’t paying attention.”

Question 1.
Who touched Alice’s shoulder?
Answer:
Alice’s sister touched her shoulder and woke her up.

Question 2.
What did Alice tell her?
Answer:
Alice told her that she had a strange dream. She told her about the white rabbit, the mad tea party, the Queen of Hearts and the trial.

Question 3.
Was her sister paying attention to her?
Answer:
No, her sister was not paying any attention to her.

Alice in Wonderland Summary

Lewis Carroll’s “Alice in Wonderland” opens with a scene of Alice reading over her sister’s shoulder. Alice sees a White Rabbit down a rabbit hole and decides to follow him. In Wonderland, she meets an assortment of strange characters including the Cheshire cat, who advises her to attend to tea party thrown by the March Hare. After the Mad Hatter tries to cut her hair, Alice runs away from the tea party. She soon finds herself in a garden, where servants are painting white roses red to satisfy the Queen of Hearts. Alice is called upon to testify against a bad thief. When Alice says that she knows nothing about the crime, the Queen orders her execution. Alice wakes up at the last minute to realize that was all a dream.

Students can Download English Poem 2 The Listeners Questions and Answers, Summary, Notes Pdf, Activity, Samacheer Kalvi 7th English Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th English Solutions Term 1 Poem Chapter 2 The Listeners

B. Find a line from the poem to match the pictures given below and write it in the blank.
Answer:

C. Read the statements and say True or False. Quote lines from the poem to support your answer
Answer:

D. Answer the following questions.

The Listeners Poem 7th Standard Question 1.
Who is the speaker?
Answer:
The speaker is a traveller.

The Listeners Poem 7th Standard Question Answer Question 2.
What was the horse doing?
Answer:
The horse was biting and chewing the grass noisily.

The Listeners Poem Questions And Answers Pdf Class 7 Question 3.
Who were the listeners?
Answer:
The listeners were the phantom or ghosts who lived in the lonely house.

The Listeners Questions And Answers Question 4.
How did the Traveller feel when nobody answered?
Answer:
The Traveller felt confused and stood still when nobody answered him.

The Listeners Poem Questions And Answers Pdf Question 5.
What kind of feeling does the poem create?
Answer:
The poem creates a mystical, lonely, strange and eerie feeling.

E. Work in pairs and answer the questions given below.

7th Standard English Memory Poem 2nd Term Question 1.
Of the forest’s ferny floor.
Pick out the words alliterated.
Answer:
The alliterated words : forest’s, ferny, floor.

7th English Poem Question 2.
Pick out the rhyming words from the poem.
Answer:
The rhyming words : head, said; sill, still; then, men; hall, call;

The Listeners Poem Questions And Answers Question 3.
Write the words which are used to create a sense of mystery.
Answer:
Silence, phantom, listeners, lone house, dark stair, empty hall, lonely traveller, no one descended, no head.

Writing

F. Discuss in groups. Draw the haunted house described in the poem and write a paragraph about it in your own words.
Answer:
The haunted house was standing alone in the forest. The moonlight shone on its door, birds lived undisturbed in the small tower on its wall and climbers grew on its window sill. The dark steps lead to the empty hall. No one lived in the house for a long.

The Listeners Additional Questions

I. Read these lines and answer the questions given below.

Listeners Poem Questions And Answers Question 1.
‘Hearkening in an air stirred and shaken.
What is the figure of speech used here?
Answer:
Metaphor. This poetic device is used when a comparison is made between two different things or ideas. In the above line, air is being compared to something that – could be stirred and shaken but actually air cannot be picked up in order to shake.

Samacheer Kalvi 7th English Memory Poem Question 2.
Stood listening in the quiet of the moonlight To that voice from the world of men:
Stood thronging the faint moonbeams on the dark stair,

(a) What is the figure of speech used here?
Answer:
Anaphora. It is the deliberate repetition of the first part of the sentence in order to achieve an artistic effect.

(b) Who were standing as a crowd and listening?
Answer:
The ghosts were standing as a crowd and listening.

(c) “Voice from the world of men” Whose voice is it?
Answer:
It is the voice of the Traveller.

II. Very Short Questions with Answers.

7th Standard English Memory Poem 1st Term Question 1.
Why did the horse champ the grasses?
Answer:
The horse had travelled a long way to reach the lonely house in the forest and it was tired and hungry. So the horse bit and chewed the grass noisily and hastily.

7th English Memory Poem Question 2.
Name the characters in the poem.
Answer:
The characters mentioned in the poem are, the traveller, the horse, ghosts and ‘they’.

7th Standard English Poem Question 3.
Who were the ‘phantom listeners’?
Answer:
The ‘phantom listeners’ were the ghosts and host of the lonely house who lived there always even before their death.

7th Standard English Poem 1st Term Question 4.
How many times did the Traveller call and knock the door?
Answer:
Three times.

The Listeners Poem Questions Question 5.
What were the ‘ghosts’ doing according to the Traveller?
Answer:
The ghosts who were the hosts of the lonely house, gathered at the steps leading to the empty hall. They were silently listening to the call of the Traveller.

III. Short Questions and Answers.

The Listeners Poem Question Answer Question 1.
When and where does the action of the poem take place?
Answer:
The action of the poem takes place during the night in a lonely house in the middle of the forest.

The Listeners Questions And Answers Class 7 Question 2.
The poem caption is “The Listeners.” Which words in the poem confirm that there were listeners?
Answer:
The phrases – ‘phantom listeners’, ‘stood listening’ and ‘hearkening’ confirm that there were listeners in the house.

7th English Book Poem Question 3.
From the poem “The Listeners” quote three phrases that tells the reader what time of day it is.
Answer:
Line 2 – Moonlit door; Line 14 – quiet of the moonlight; Line 16 – faint moonbeams on the dark stair.

The Listeners Poem Class 7 Question 4.
Justify with the words from the poem that the house was uninhabited.
Answer:
When the traveller knocked the house and called, no one responded. The floor around the house was ferny as no one used the area. Since, there was no one in the house, birds started living in the turret. Creepers grew on the window sill. Host of ghosts dwell in the empty house.

The Listeners Poem Questions And Answers Class 7 Question 5.
State the words that portray greenery in and around the house.
Answer:
Champed the grasses, forest’s ferny floor and leaf-fringed sill.

IV. Paragraph Questions with Answers.

The Listeners Summary Questions And Answers Question 1.
Describe the lonely house in the forest.
Answer:
The lonely house in the forest had a fern plant carpet on the floor around it. There was a small tower that projected from the wall of the lonely house, where birds nested. The window sill of the house was framed with creepers. The moonlight shone on its door, dark stairs and its empty hall.

Question 2.
What do you know about the ‘phantom listeners’ by reading the poem?
Answer:
According to the lines in the poem, the phantom listeners are the ghosts who lived in r the lonely house of the forest. They were the host and the owner of the house while they were alive. But even after their death they continue to live there as a group.
In the dark silent night they listen attentively to the sound of the traveller which vibrates the air, by standing as a crowd under the dull moonlight on the dark stair that leads down to the empty hall.

Warm up
Question 1.
You are walking into a grove at 12 noon. You feel that somebody is following you. When you look behind, nobody is there. How would you feel? What would you do? Share it in the class.
Answer:
Once I was walking through a thick mango grove all alone at mid noon when the scorching sun was right above the head but the close branches of the mango trees formed an umbrella over me. As I walked solitary in the middle of the grove, I could hear only the rustle of the trees, and chirping of the birds. The giant shadows of the huge trees moved in front of me. A strange feeling tickled my stomach as if a powerful alien figure accompanied me. Fear choked my throat and I started walking fast making large paces. Crossing a ruined well I heard the frogs croak that doubled terror in me. But no human soul was seen around. I called all the gods on earth for my rescue. Alas! The discerning spirit within me told it was just an eerie feel in me. Now I realised it was just an impact of the ghost film that I had viewed the previous night. I laughed to myself and continued to walk boldly whistling towards my destination.

The Listeners Summary

A man identified as the ‘Traveller’ arrives on horseback late at night at a lone house in a forest. He knocks on the moonlit door asking if anybody is there. His horse was hungrily biting and chewing the grass noisily amidst the silence of the forest.

The forest ground was covered with ferns. A bird flew from the cylindrical tower on the wall of the house which proved that it lived there undisturbed.

The Traveller knocks thrice on the door asking if anyone is there but no one responds to his call. Nobody peeped from the leaves creeping window sill nor they leaned down and looked into his grey eyes.

When the Traveller was standing confused and still, the host of ghosts that lived in the lonely house stood listening in the silence of the moonlight to the voice of the human. In the dull moonlight they stood crowded on the dark steps which lead to the empty hall in the house. They were attentively listening to the call of the lonely Traveller which disturbed the calm environment.

Students can Download Social Science History Chapter 1 Sources of Medieval India Questions and Answers, Notes Pdf, Samacheer Kalvi 7th Social Science Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th Social Science History Solutions Term 1 Chapter 1 Sources of Medieval India

Samacheer Kalvi 7th Social Science Sources of Medieval India Textual Evaluation

I. Choose the correct answer:

Sources Of Medieval India Class 7 Question 1.
are the writings engraved on solid surfaces such as rocks, stones, temple wails and metals.
(a) Chronicles
(b) Travelogues
(c) Coins
(d) Inscriptions
Answer:
(d) Inscriptions

Sources Of Medieval Indian History Class 7 Question 2.
was the land gifted to temples.
(a) Vellanvagai
(b) Shalabhoga
(c) Brahmadeya
(d) Devadana
Answer:
(d) Devadana

Sources Of Medieval India Questions And Answers Question 3.
__________ period was known as the period of devotional literature.
(a) Chola
(b) Pandya
(c) Rajput
(d) Vijayanagara
Answer:
(a) Chola

Sources Of Medieval Indian History Class 7 Question Answer Question 4.
__________ provides information about the first Sultan of Delhi.
(a) Ain-i-Akbari
(b) Taj-ul-Ma’asir
(c) Tuzk-i-Jahangiri
(d) Tarikh-i-Frishta
Answer:
(b) Taj-ul-Ma’asir

Samacheer Kalvi Guru 7th Social Science Question 5.
__________ an Arab-born Morocco scholar, travelled from Morocco to India.
(a) Marco Polo
(b) A1 Beruni
(c) Domingo Paes
(d) Ibn Battuta
Answer:
(d) Ibn Battuta

II. Fill in the Blanks

1. __________ inscriptions provide details about administration in a Brahmadeya village.
2. __________ had stamped the figure of Goddess Lakshmi on his gold coins and had his name inscribed on it.
3. __________ 3.6 grains of silver amounted to a
4. __________ was patronised by Sultan Nazir-ud-din Mahmud of Slave Dynasty.
5. __________ An Italian traveller visited Vijayanagar Empire in 1420.

Answer:

1. Uttiramerur
2. Muhammad Ghori
3. Jital
4. Minhaj-us-Siraj
5. Nicolo Conti

III. Match the following

A		B
Khajuraho	i.	Odisha
Konark	ii.	Hampi
Dilwara	iii.	Madhya Pradesh
Virupaksha	iv.	Rajasthan

Answer:

1. iii
2. i
3. iv
4. ii

IV. State true or false :

Samacheer Kalvi 7th History Book Question 1.
Pallichchandam was the land donated to Jaina institution.
Answer:
True

Samacheer Kalvi Guru 7th Social Question 2.
The composition of metal coins gives us information on the political condition of the empire.
Answer:
False
Correct statement: The composition of metals in the coins gives us information on the economic condition of the empire.

Question 3.
The high cost of copper made palm leaf and paper cheaper alternatives for recording royal orders and events in royal courts.
Answer:
True

Question 4.
Domingo Paes, a Portuguese traveller, visited the Chola Empire in 1522.
Answer:
False
Correct statement: Domingo Paes, a Portuguese traveller, visited the Vijayanagar in 1522.

V. Match the statement with the reason Tick
(a) Tick (✓) the appropriate answer.

Question 1.
Assertion (A) :Muhammad Ghori’s gold coins carried the figure of Goddess Lakshmi.
Reason (R) :The Turkish invader was liberal in his religious outlook.
a) R is the correct explanation of A.
b) R is not the correct explanation of A.
c) A is wrong and R is correct.
d) A and R are wrong.
Answer :
(a) R is the correct explanation of A

(b) Find out the wrong pair

1. Madhura Vijayam – Gangadevi
2. Abul Fazal – Ain-i-Akbari
3. Ibn Battura – Tahquiq-i-Hind
4. Amuktamalyatha – Krishnadevaraya

Answer:
3. Ibn Battuta – Tahquiq-i-Hind

(c) Find out the odd one
Question 1.
Inscriptions, Travelogues, Monuments, Coins
Answer:
Travelogues

VI. Answer the following in one or two sentences

Question 1.
Who compiled Nalayira Divyaprabhandham ?
Answer:
Nathamuni

Question 2.
What does the word Tuzk mean?
Answer:
Auto biography

Question 3.
Name Jahangir’s memoir.
Tuzk-i-Jahangiri

Question 4.
Name the two different types of sources for the study of history.
Answer:
Primary sources and Secondary sources are the two different types of sources for the study of history.

Question 5.
List out the important mosques and forts constructed during the medieval times.
Answer:

1. Quwwat-ul Islam Masjid, Moth-ki- Masjid, Jama Masjid, Fatehpur Sikri Dargah (all in and around Delhi) and Charminar (Hyderabad) are the important mosques belonging to the medieval times.
2. The forts of historical importance are Agra Fort, Chittor Fort, Gwalior Fort and Delhi Red Fort and

Question 6.
Mention the important foreign travellers who visited India during the medieval period.
Answer:
Marco Polo, a Venetian traveller, Al-Beruni, Ibn Battuta Nicolo Conti, Abdur-Razzaq, Domingo Paes.

VII. Answer the following :

Question 1.
Describe the different types of coins introduced by the rulers of Delhi Sultanate.
Answer:

1. The picture and the legend on the coins convey the names of kings with their titles and portraits, events, places, dates, dynasties and logos.
2. The composition of metals in the coins gives us information on the economic condition of the empire.
3. Mention of king’s achievements like military conquests, territorial expansion, trade links and religious faith can also be found in the coins.
4. Muhammad Ghori had stamped the figure of Goddess Lakshmi on his gold coins and had his name inscribed on it.
5. This coin tells us that this early Turkish invader was in all likelihood liberal in religious outlook. Copper Jitals are available for the study of the period of the Delhi Sultans.
6. Silver Tanka introduced by Iltutmish, Ala-ud-din Khalji’s gold coins, Muhammad-bin- Tughluq’s copper token currency are indicative of coinage as well as the economic prosperity or otherwise of the country of the time. A jital contained 3.6 grains of silver. Forty eight jitals were equal to 1 silver tanka.

VIII. Answer Grid

1. _______________ was a courtier of Emperor Aurangazeb. Answer: Khafi khan	2. Tiruvalangadu copper plates belong to Answer : Rajendra Chola I
3. _______________ was the land for the maintenance of the school. Answer : Shalabhoga	4. _______________ compiled Periyapuranam. Answer : Sekkizhar
5. _______________ is an Arabic word meaning history. Answer: Tariq or Tahquiq.	6. Muhammed bin Tughluq transferred his capital from Delhi to ____________ in the south. Answer: Devagiri (Daulatabad).

IX. HOTS :

Question 1.
The composition of metals in coins is indicative of the economic prosperity of the empire-
Substantiate.
Answer:

1. Metals like Gold and Silver are precious and rare elements.
2. They are shiny, strong and have high economic value.
3. If such metals are used in coins in an empire, it indicates its economic prosperity.

X. Student Activity :

Prepare an album collecting pictures of palaces, tombs, mosques and forts of Medieval India

XI. Life skill :

Question 1.
Find out from the libraries in your town or village and prepare a report about the primary and secondary sources available there.
Answer:
On a visit to a library nearby I found that it had primary and secondary sources.

I found historical documents, statistical data, pieces of creative writing, speeches and art objects. Interviews, surveys, field work also are available here. I also could see and sources like articles in news papers, popular magazines, book a movie views and articles in journals.

Samacheer Kalvi 7th Social Science Sources of Medieval India Additional Questions

I. Choose the correct answer:

Question 1.
Uttiramerur inscriptions in ______ district provide details about Brahmadeya village administration.
(a) Salem
(b) Kanchipuram
(c) Chennai
(d) Vellore
Answer:
(b) Kanchipuram

Question 2.
______ jitals are available for the study Of the period Of the Delhi sultans.
(a) Gold
(b) Silver
(c) Copper
(d) Aluminium
Answer:
(c) Copper

II. Fill in the blanks

1. ______ grants, which were treated as legal documents, have significant source value.
2. Palaces in Jaipur, Jaisalmer and Jodhpur signify the greatness of the _____ dynasty.
3. The ______ period was known as the period of devotional literature in South India
4. ______ are pictures, images in drawing or painting

Answer:

1. Copper – Plate
2. Rajput
3. Chola
4. Portraits

III. Match the following:

	A		B
a.	Abul Fazal	i.	King’s achievements
b.	Iltutmish	ii.	Akbar nama
c.	Coins	iii.	Kalhana
d.	Rihla	iv.	Chahalgani
e.	Rajatarangini	V.	The Travels

Answer:
a – ii
b – iv
c – i
d – v
e – iii

IV. State true or false:

Question 1.
Zia – Ud – Bami wrote Tarikh – i – Firoz shahi.
Answer:
True

Question 2.
Tabakat-i- Akbari was authored by Abul Faze.
False
Correct statement: Tabakat-i- Akbari was authored by Nizam-ud-din Ahmad.

Question 3.
Ibn Battuta tells us of caste in India and the practice of Sati.
Answer:
True

V. Match the statement with the reason. Tick the appropriate answer:

Question 1.
Statement : Minhaj – us- siraj, patronised by Sultan Nazir – ud – din Mahmud, wrote Tabakat – i – Nasiri
Reason : The compendium was named after its patron.
(a) Statement is true but Reason is wrong.
(b) Statement and Reason are correct.
(c) Statement is wrong and reason is correct.
(d) Both Statement and reason are wrong.
Answer:
(b) Statement and Reason are correct.

Question 2.
Statement :Accroding to Ibn Battuta, a Morocco scholar, Egypt was rich in the 16th century.
Reason: The whole of Indian trade with the west passed through Egypt
(a) Statement is true but Reason is wrong.
(b) Statement and Reason are correct.
(c) Statement is wrong and reason is correct.
(d) Both Statement and reason are wrong.
Answer:
(c) Statement is wrong and reason is correct.

Question 3.
Statement: Kayal, which was a port city is situated in this district of Tamil Nadu.
Find out which of the following is correct?
(a) Kanyakumari
(b) Tirunelveli
(c) Thoothukudi
(d) Ramanathapuram
Answer:
(c) Thoothukudi

Question 4.
Find out the wrong Pair
(a) Nalayira Divyaprabhandham – 12Azhwars
(b) Devaram – Appar, Sambandar, Sundarar
(c) Thiruvasagam – Manikkavasakar
(d) GitaGovindam – Kabirdas
Answer:
(d) Gita Govindam – Kabir das

Question 5.
pick out the wrong statement.
(a) Al – Beruni accompanied Mahmud of Ghazni in one of his campaigns
(b) He stayed in India for 10 years.
(c) The most accurate accounts of Mahmud’s Somnath expedition is that of Alberuni
(d) He knew only Arabic.
Answer:
(d) He knew only Arabic

VI. Answer in one or two sentences

Question 1.
Who composed Nalayira Divya Prabhandam?
Answer:
Nalayira Divya Prabhandam was composed by 12 Azhwars.

Question 2.
By whom was Devaram composed and compiled?
Answer:

1. Devaram composed by Appar, Sundarar and Sambandar
2. Compiled by Nambiyandar Nambi.

Question 3.
How many jitals were equal to 1 siver tanka?
Answer:
Forty – eight

VII. HOTS :

Question 1.
How are sources of history useful to us?
Answer:

1. Source are the supporting materials, documents or records in the form of evidence that help to reconstruct the past.
2. They are available in different forms such as Inscriptions, monuments, coins, chronicles, travelogues, biographies etc.,
3. Through these sources we get to know a lot of information about social, economic and political condition of a country under different rulers.

Who am I ?

1. I am a person who writes accounts of important historical events.
2. I am a collection of detailed information about a particular subject.
3. I am a tall tower, typically part of a mosque.
4. I am an Arabic word meaning generations or centuries.

Answer:

1. Chronicles
2. Compendium
3. Minaret
4. Tabakat

Students can Download Science Chapter 3 Matter Around Us Questions and Answers, Notes Pdf, Samacheer Kalvi 7th Science Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th Science Solutions Term 1 Chapter 3 Matter Around Us

Samacheer Kalvi 7th Science Matter Around Us Textual Evaluation

I. Choose the appropriate answer :

Matter Around Us Class 7 Question 1.
Which of the following is an example of a metal?
(a) Iron
(b) Oxygen
(c) Helium
(d) Water
Answer:
(a) Iron

7th Science Matter Around Us Question 2.
Oxygen, hydrogen, and sulphur are examples of which of the following?
(a) Metals
(b) Non-metals
(c) Metalloids
(d) Inert gases
Answer:
(b) Non-metals

7th Standard Science Matter Around Us Question 3.
Which of the following is a short and scientific way of representing one molecule of an element or compound?
(a) Mathematical formula
(b) Chemical formula
(c) Mathematical symbol
(d) Chemical symbol
Answer:
(d) Chemical symbol

7th Standard Science Matter Around Us Question Answer Question 4.
The metals which is a liquid at room temperature
(a) Chlorine
(b) Sulphur
(c) Mercury
(d) Silver
Answer:
(c) Mercury

Matter Around Us Class 9 Samacheer Kalvi Question 5.
An element which is always lustrous, malleable and ductile
(a) non-metal
(b) metal
(c) Metalloid
(d) gas
Answer:
(b) metal

II. Fill in the blanks :

1. The smallest particle of matter that can exist by itself ______
2. A compound containing one atom of carbon and two atoms of oxygen is ______
3. ______ is the only non-metal conducts electricity.
4. Elements are made up of ______ kinds of atoms.
5. ______of some elements are derived from Latin or Greek names of the elements.
6. There are ______ number of known elements.
7. Elements are the ______ form of pure substances.
8. The first letter of an element always written in ______ letter.
9. Molecule containing more than three atoms are known as ______
10. ______ is the most abundant gas in the atmosphere.

Answer:

1. atom
2. CO₂
3. Graphite
4. same
5. Symbol
6. 118
7. simplest
8. capital
9. polyatomic molecule
10. Nitrogen

III. Fill in the blanks :

1. Mercury: liquid at room temperature:: Oxygen: _________
2. Non metal conducting electricity: _______ :: Metal conducting electricity: Copper
3. Elements: combine to form compounds:: Compounds: ________
4. Atoms: fundamental particle of an element:: ________ fundamental particles of a compound

Answer:

1. Gas at room temperature
2. Graphite
3. can be split into elements
4. elements

IV. True of False. If False, give the correct statement.

Matter Around Us Questions And Answers Question 1.
Two different elements may have similar atoms.
Answer:
True

Samacheer Kalvi Guru 7th Science Question 2.
Compounds and elements are pure substance.
Answer:
True

Samacheer Kalvi 7th Science Books Answers Question 3.
Atoms cannot exist alone; they can only exist as groups called molecules.
Answer:
True

Samacheer Kalvi 7th Guide Science Question 4.
NaCl represents one molecule of sodium chloride.
Answer:
True

Samacheer Kalvi 7th Books Science Question 5.
Argon is mono atomic gas.
Answer:
True

V. Answer in brief.

Samacheer Kalvi 7th Science Solution Question 1.
Write the chemical formula and name the elements present in the following compounds:
a. Sodium chloride
b. Potassium hydroxide
c. Carbon-di-oxide
d. Calcium oxide
e. Sulphur dioxide
Answer:

		Chemical fromula	Elements present
a.	Sodium chloride	NaCl	Sodium (Na), Chlorine (Cl)
b.	Potassium hydroxide	KOH	Potassium (K), Oxygen (O), Hydrogen (H)
c.	Carbon-di-oxide	CO2	Carbon (C), Oxygen (O2)
d.	Calcium oxide	CaO	Calcium (C), Oxygen (O2)
e.	Sulphur dioxide	SO2	Sulphur (S), Oxygen (O2)

Samacheer Kalvi.Guru 7th Science Question 2.

Answer:

Samacheer Kalvi Guru Science 7th Question 3.
What do you understand by chemical formula of a compound? What is its significance?
Answer:

1. A chemical formula is a symbolic representation of one molecule of an element or a compound.
2. It provides information about the elements present in the molecule and the number of atoms of each element. The chemical formula tells us the types of atoms and the number of each type of atom in one molecule of substance.

Samacheer Kalvi Science 7th Standard Question 4.
Define the following terms with an example of each:
a. Element
b. Compound
c. Metal
d. Non-metal
e. Metalloid
Answer:
(a) Element: It is a substance that cannot be broken down into simpler substance by chemical means Ex. : Oxygen, Hydrogen, Gold & Helium.

(b) Compound A compound is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions. Ex : H?0, NaCl.

(c) Metal A chemical element that is an effective conductor of electricity and heat can be defined as a metal. Ex.: Copper, Iron, Silver, etc.
(d) Non-Metal Non-metal is an element that doesn’t have the characteristics of metal including, (i.e.) ability to conduct heat or electricity luster or flexibility. Ex. Carbon Iodine, Sulphur.

(e) Metalloid : Metalloid is a chemical element that exhibits some properties of metals and some of non-metals. Metalloids are generally semi-conductors. Ex. : Silicon. Arsenic, Antimony and Boron.

Samacheer Kalvi Guru 7th Standard Science Question 5.
Write the symbols for the following elements and classify them as solid, liquid and gas.
Aluminum, carbon, chlorine, mercury, hydrogen and helium.
Answer:

Element	Symbol	Classification
Aluminum	Al	Solid
Carbon	C	Solid
Chlorine.	Cl	Gas
Mercury.	Hg	Liquid
Hydrogen.	H	Gas
Helium	He	Gas

Samacheer Kalvi 7th Science Book Answers Question 6.
Classify the following as metals, non-metals and metalloids
Sodium, Bismuth, Silver, Nitrogen, Silicon, carbon, chlorine, Iron, copper.
Answer:

Metal	Non-metal	Metal	Non-metal
Sodium	Metal	Carbon	Non-metal
Bismuth	Metal	Chlorine	Non-metal
Silver	Metal	Iron	Metal
Nitrogen	Non-metal	Copper	Metal
Silicon	Metalloid

Samacheer Kalvi 7th Science Books Answers Pdf Question 7.
Classify the following as elements and compounds.
Water, common salt, sugar, carbon dioxide, iodine and lithium
Answer:

Elements	Compounds
Water	Compound
Common salt	compound
Sugar	Compound
Carbon dioxide	Compound
Iodine	Element
Lithium	Element

Samacheer Kalvi 7th Standard Science Question 8.
Write the chemical formula for the following elements.
a. Hydrogen
b. Nitrogen
c. Ozone
d. Sulphur
Answer:

Elements	Formula
Hydrogen	H
Nitrogen	N
Ozone	O3
Sulphur	S

Samacheer Kalvi 7th Science Question 9.
What are elements? What are they made of. Give two examples.
Answer:

1. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.
2. It is made of entirely from one type of atom.
3. Example : Hydrogen, Oxygen is made from atoms containing a single proton and a single electron.

7th Standard Science Samacheer Kalvi Question 10.
Define molecule.
Answer:

1. When an atom combines with another atom (or atoms) and forms a compound it is called as molecule.
2. A molecule is made up of two or more atoms chemically combined.

Samacheer Kalvi 7th Science Book Back Answers Question 11.
What are compounds? Give two examples.
Answer:
A compound is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions.
Example : H₂O, NaCl,

Question 12.
Give an example for the elements derived from their Latin names.
Answer:

Element	Latin Name	Symbol
Copper	Cuprum	Cu
Lead	Plumbum	Pb
Potassium	Kalium	K
Iron	Ferrum	Fe
Mercury	Hydrargyrum	Hg
Sodium	Natrium	Na

Question 13.
What is atomicity of elements?
Answer:
Atomicity is the total number of atoms present in one molecule of an element, compound or a substance.

Question 14.
Calculate the atomicity of H2S04.
Answer:
A molecule of sulphuric acid (H₂S0₄) consists of 2 hydrogen atom, 1 Sulphur atom and 4 oxygen atoms. Hence its atomicity 2 + 1 + 4 = 7.

VI. Answer in detail :

Question 1.
Differentiate metals and non metals.
Answer:

Metals	Non-Metals
Metals are lustrous. They have a shiny	Non metals are non lustrous. They
surface	have non- shiny surface
Metals are generally hard	Non-metals are generally soft
Most metals are bendable	Non-metals are non bendable
Most metals can be bent, beaten into sheets and they can drawn into wires	Non-metals are non ductile
Most metals are good conductors of electricity	Non-metals are bad conductors of electricity
Most metals are good conductors of heat	Non-metals are bad conductors of heat
Most metals are making ringing sound when struck. Hence, they are used to make objects like bells	Non-metals does not make any sound when they struck
Ex. : Copper, Lead, Tin, Nickel	Ex. : Carbon, Iodine, Sulphur

Question 2.
Explain the characteristics of compounds.
Answer:

1. A compound is formed only when the constituent elements combine in a fixed proportion.
2. The properties of a compound are different from those of its constituent elements
3. A compound cannot be broken down by physical methods.
4. This is because a compound is made up of different elements that are chemically combined. Sodium chloride cannot be separated by physical methods such as filtration.
5. A compound can be separated into its constituent elements by chemical methods only.

Question 3.
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
Answer:
The following rules are followed while assigning symbol to an elements:

1. Chemical symbols usually consist of one or two letters.
2. The symbols of most elements correspond to the first letter (which is capitalized) of their English name. For example, the symbol for oxygen is “O” and that for hydrogen is “H”.
3. When there is more than one element that begins with the same letter, their symbols take two letters.
4. The first letter is capitalised while the second letter has a lower case.
5. For example, the names of both hydrogen and helium begin with H. So, hydrogen is represented by the symbol H and Helium by He.

Example:

Question 4.
Differentiate between elements and compounds.
Answer:

Elements	Compounds
An element is the simplest substance	A compound is a chemical substance formed by the combination of two or more elements
Elements combine to form compounds	Compounds can be split into elements
Atoms are the fundamental particle of an element	Molecules are the fundamental particles of a compound

Question 5.
Write any five characteristics of compound.
Characteristics of compound:
Answer:

1. A compound is formed only when the constituent elements combine in a fixed proportion.
2. The properties of a compound are different from those of its constituent elements.
3. A compound cannot be broken down by physical methods.
4. Compound is made up of different elements that are chemically combined.
5. A compound can be separated into its constituent elements by chemical methods only.

Question 6.
List comparative properties of metals and non-metals. Give three examples of each.
Answer:

Metals	Non-Metals
Metals are lustrous. They have a shiny	Non metals are non lustrous. They
surface	have non- shiny surface
Metals are generally hard	Non-metals are generally soft
Most metals are bendable	Non-metals are non bendable
Most metals can be bent, beaten into sheets and they can drawn into wires	Non-metals are non ductile

Question 7.
Write down the properties of metalloids.
Answer:
Properties of metalloids :

1. Metalloids usually look like metals but behave largely like non-metals.
2. Physically they are shiny, brittle solids with intermediate to relatively good electrical conductivity.
3. They can from alloys with metals.
4. Most of their physical and chemical properties are intermediate in nature, (v) They are semiconductors.
5. All are solids at room temperature.
6. Example : Germanium, Boron, Antimony, Silicon.

VII. Rewrite the sentence in correct form :

Question 1.
Elements contains two or more kinds of atoms and compounds contains only one kinds of atoms.
Answer:
Elements contains two or more kinds of atoms and compounds contains two or more kinds of elements.

VIII. Higher Order Thinking questions :

Question 1.
Lists the metals, non-metals and metalloids which you used in your house, schools. Compare their properties.
Answer:
Metals and their uses in our houses & schools :

1. Magnesium is used in the laboratory as magnesium ribbon.
2. Copper is used cooking utensils.
3. Zinc is mainly used as a protective coat for iron is our school and house gates.
4. Aluminum is used as cooking utensils and electrical cables which are used in our schools and houses.
5. Iron and steel are widely used is construction of house and school.
6. Sodium is used as a table salt and for flavoring, preserving food.
7. Coins are made up of nickel.
8. Lead is used in car batteries. Lead based alloys find extensive use in printing

Non-metals and their uses in houses & school:

1. Oxygen is essential for the breathing. It is used as oxidising agent in laboratory. Chlorine is used for purifying water.
2. Graphite is used in pencil leads.
3. Carbon is used as a fuel.
4. Bromine is used in dyes.
5. Iodine is used in laboratory to test for starch.

Metalloids and their uses in houses & schools :

1. Silicon is used in glass items.
2. Antimony is used in optical discs.
3. Tellurium is used in solar cells.
4. Boron is used in washing powders.
5. Germanium is used to make transistors which is used in laboratory in electrical devices.

Comparsion of properties of metals, non-metals & metalloids

Metals	Non-metals	Metalloids
They have lustre	They are not lustrous	Intermediate
Conduct heat and electricity	Poor conductors of electricity except graphite	Intermediate (semi­conductors)
They are malleable and ductile	They are neither malleable nor ductile.	Intermediate

Question 2.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, this same latch was not difficult to open at night. Aakash observed that the latch and the gate are exposed to the sun during the day.
a) Formulate a hypothesis based on the information provided.
b) Briefly state how you would test the hypothesis stated in (a).
Answer:
(a) Solids (Iron) expand on heating and contract on cooling. This causes the volume to matter of increase during heating or expansion, the mass of matter does not change.
(b) During heating the distance between the particles of the iron latch change. In an iron latch the distance between the iron particles increases when they gain enough heat. So during hot days the latch on the gate was difficult to open. At night, because of cooling the distance between the particles decreases. So at night it was not difficult to open the latch on the gate.

Question 3.
What changes take place in the movement and arrangement of particles during heating process?
Answer:
When a substance is heated, its internal energy increases.

1. The movement of its particles increases.
2. Bonds between particles break when a substance melts evaporates. This causes the volume of matter to increase.
3. The closeness, arrangement and motion of the particles in a substance change when it changes state. But the size of the particles remain in same size, (i.e.) the mass of matter does not change.

Question 4.
In the diagram given below, the circle, square and triangle represent the atoms of different elements different elements.

Identify all combinations that represent.
a) A molecule of a compound
b) A molecule of an element consisting of two atoms
c) A molecule of an element consisting of three atoms
Answer:

IX. Assertion-reason questions :

Question 1.
Directions: Please refer to the following instructions:
A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
b. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.
C. The 1st statement is false while the 2nd statement is true.
D. Both statements are false.

	1st Statement	2nd Statement
1.	Oxygen is a element	Oxygen cannot be broken down into anything simpler
2.	Hydrogen is an element	Hydrogen cannot be broken down into anything simpler
3.	Air is a compound	Air consists of carbon dioxide
4.	Air is a mixture of elements only	Only nitrogen, oxygen and neon gases exist in air
5.	Mercury is solid in room temperature	Mercury is a non-metal

Answer

1. (A) Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
2. (A) Both statements are true and the 2nd statement is a correct explanation of the 1 st statement.
3. (D) Both statements are false.
Correct statement:

1. Air is a mixture of gases.
2. Air consists of Nitrogen Oxygen, CO,, other noble gases.

4. (A) Both statements are true and the 2nd statement is a correct explanation of the 1 st statement.
5. (D) Both statements are false.
Correct statement:

1. Mercury is liquid at room temperature.
2. Mercury is a metal.

Samacheer Kalvi 7th Science Matter Around Us Intext Activities

Activity – 1
Complete the following table by writing compounds of its constituents.
Answer:

Activity – 2
Complete the following table by counting the number of different elements in a compounds and give appropriate name.
Answer:

Activity – 3
Write down the symbols of the following elements.
Answer:

Activity – 4
Write down atomicity of the following elements and compounds
Answer:

Samacheer Kalvi 7th Science Matter Around Us Additional Questions

I. Choose the correct answers:

Question 1.
The graphite refill used is pencil is made of element called __________
(a) graphite
(b) carbon
(c) silicon
(d) sodium
Answer:
(b) carbon

Question 2.
The smallest unit of an element is __________
(a) atom
(b) molecule
(c) compound
(d) none
Answer:
(a) atom

Question 3.
The most abundant type of atom is the universe is __________
(a) Helium
(b) Hydrogen
(c) Argon
(d) Argon
Answer:
(b) Hydrogen

Question 4.
__________ can be formed by the same or different kinds of atoms.
(a) Atom
(b) Molecule
(c) Gases
(d) None
Answer:
(b) Molecule

Question 5.
__________ is a substance that is made up of three oxygen atoms chemically combined.
(a) Oxygen
(b) Hydrogen
(b) Ozone
(d) CO2
Answer:
(a) Oxygen

Question 6.
A molecule containing three atoms is called a __________ molecule
(a) monoatomic
(b) diatomic
(c) triatomic
(d) polyatomic
Answer:
(c) triatomic

Question 7.
A molecule which contains only one atom is called __________ molecule
(a) monoatomic
(b) diatomic
(c) triatomic
(d) none
Answer:
(a) monoatomic

Question 8.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of __________
(a) hydrogen
(b) ozone
(c) water
(d) none
Answer:
(c) water

Question 9.
__________ is the first scientist who used the term element.
(a) New ton
(b) Einstein
(c) Robertr boyle
(d) Robert hook
Answer:
(c) Robertr boyle

Question 10.
Matter is its simplest form is called __________
(a) molecule
(b) Metals
(c) element
(d) none
Answer:
(c) element

II. Fill in the blanks :

1. The name copper was taken from ______
2. The first letter of a symbol of an element is always written as a the second letter as a ______ letter and the second letter as a _____ letter
3. There are ______ hydrogen atoms in water molecule.
4. There is ______ oxygen atom is water molecule.
5. ______ is the total number atoms present in one molecule of an element, compound or a substance.
6. ______ is a mixture of gases
7. ______ is the life-giving element is the air
8. During heating or expansion, the ______
9. ______ is the smallest particle of an element.
10. ______ of an element consist of a fixed number of different types of atom.

Answer:

1. cypress
2. capital,small
3. 2
4. 1
5. atomicity
6. Air
7. Oxygen
8. mass
9. Atom
10. Molecules

III. Write true or false :

Question 1.
Metals are usually solids or gases at room temperature.
Answer:
False. Metals are usually solids at room temperature.

Question 2.
Non-metals are non-malleable.
Answer:
True.

Question 3.
Non-metals are usually good conductors of heat and electricity.
Answer:
(False) Metals are usually good conductors of heat and electricity.

Question 4.
Sodium chloride is used as table salt and for flavoring and preserving food.
Answer:
True.

Question 5.
Lead is also known as plumbum.
Answer:
True

IV. Match the following :

Question 1.

1.	Co2	(a)	Robert Boyle
2.	Sulphur	(b)	Making mobile phones
3.	Element	(c)	triatomic molecule
4.	Gallium	(d)	Polyatomic molecule

Answer:

1. c
2. d
3. a
4. b

Question 2.

1.	Non-metals	(a)	Silicon
2.	Metals	(b)	fire extinguisher
3.	Metalloids	(c)	dull and soft
4.	Oxygen	(d)	hard and shiny
5.	Water	(e)	supports fire

Answer:

1. c
2. d
3. a
4. b

V. Give very short answer :

Question 1.
How many elements are known at present?
Answer:
118.

Question 2.
Name the element which is used for making computer chips.
Answer:
Silicon

Question 3.
Name the constituents of water.
Answer:
Hydrogen and Oxygen.

Question 4.
What is the expansion of IUPAC.
Answer:
International Union of Pure and Applied Chemistry.

Question 5.
What is the Latin name of Sodium?
Answer:
Natrium

Question 6.
What is a molecule?
Answer:
Molecule is the smallest unit of compound.

Question 7.
What is the fundamental particle of an element?
Answer:
Atom.

Question 8.
What is a chemical formula?
Answer:
A chemical formula is a symbolic representation of one molecule of an element or a compound.

VI. Give short answer :

Question 1.
What is an atom?
Answer:
The smallest unit of an element that exhibits the properties of the element is called as ‘atom’.

Question 2.
What are the 3 most abundant atoms on the earth?
Answer:
On earth the three most abundant atom are iron, oxygen, and silicon.

Question 3.
Write any two classification of molecule.
Answer:

1. A molecule which contains only one atom is called monatomic molecule (inert gases)
2. A molecule which contains two atoms is called diatomic molecule (oxygen, nitric oxide, hydrogen, etc.).

Question 4.
Classify the following as element and compound, (i) Silver (ii) Ammonia (iii) Water (iv) Mercury.
Answer:

1. Silver – element
2. Ammonia – compound
3. Water – compound
4. Mercury – clement

Question 5.
Give an account of elements known to us.
Answer:
There are 118 known elements till date. 94 of these elements occur naturally while 24 elements have been created artificially in the laboratory.

Question 6.
What are metalloids? Give examples.
Answer:
Metalloids are the elements which have properties intermediate, between those of metals and non-metals. Ex.: Boron, Silicon, Germanium, Arsenic, Antimony.

Question 7.
Give an example of a metal which
(a) is liquid at room temperature.
(b) is the best conductor of heat.
Answer:
a) Mercury
b) Silver, Copper

Question 8.
Write any two properties of a compound.
Answer:

1. The properties of a compound are different from those of its constituent elements.
2. A compound cannot be broken down by physical methods. This is because a compound is made up of different elements that are chemically combined. Sodium chloride cannot be separated by physical methods such as filtration.

Question 9.
What happens to matter during heating?
Answer:

1. SOLID : When solid is heated, the particles gain energy and vibrate more vigorously.
2. LIQUID : Melting occurs when the melting point is reached. The solid changes to its liquid state.
3. LIQUID : When a liquid is heated the particles gain energy and vibrate more
4. GAS : Boiling occurs when the boiling point is reached. The liquid changes to its gaseous State.

Question 10.
How do hot air balloons float?
Answer:
When air inside the hot air balloon is heated with a burner, it expands. The expansion causes the density of the air inside the balloon to decrease. Hence, the air inside the balloon has a lower density that the air outside of the balloon. This difference is density allows the hot-air balloon to float.

VII. Complete the table

Question 1.

Answer:

Question 2.

Answer:

Question 3.

Compound	Constituent elements
Sodium carbonate	Sodium, Carbon. Oxygen
Water	(i) ?
Calcium oxide	(ii) ?
Sugar	Carbon, Hydrogen, Oxygen

Answer:

1. Hydrogen, Oxygen
2. Calcium, Oxygen.

Question 4.
Complete the table by writing the symbols of the following elements

Element	Symbol
Aluminium	Al
Nickel
Bromine
Helium
Magnesium

Answer:

Element	Symbol
Aluminium	Al
Nickel	Ni
Bromine	Br
Helium	He
Magnesium	Mg

Question 5.
Complete the table:

Element	Latin Name	Symbol
Mercury	–	Hg
Lead	Plumbum	–
Iron	–	Fe
Potassium	Kalium	–

Answer:

1. Hydrargyrum
2. Pb
3. Ferrum
4. K

VIII. Long answer questions :

Question 1.

1. Draw the symbol for some elements as proposed by Dalton.
2. What are rules to be followed while assigning symbol to element.

Answer:

1. Symbol for some elements as proposed by Dalton.
2. The following rules are followed while assigning symbol to an elements:

(a) Chemical symbols usually consist of one or two letters
(b) The symbols of most elements correspond to the first letter (which is capitalized) of their English name. For example, the symbol for oxygen is “O” and that for hydrogen is “H”.

Higher Order Thinking questions : (HOTS)

Question 1.
Why is hydrogen considered as an element?
Answer:
Hydrogen is considered as an element because,

1. Hydrogen cannot be broken into new substance by ordinary physical or chemical means, (i.e) by applying heat, light.
2. Hydrogen has one kind of atoms.

Question 2.
Why is water considered as compound?
Answer:
Water is considered as compound because,

1. Water is composed of two elements: H₂ and 0₂
2. The ratio of Hydrogen and Oxygen by mass in any sample of pure water is the same.
3. The properties of water are different from its constituent elements : Hydrogen and Oxygen.
4. Water can be decomposed only by chemical methods into Hydrogen and Oxygen.

Question 3.
Write the difference between a mixture and compound.
Answer:

Mixture	Compound
When two or more substances are mixed at random it forms a mixture.	A compound is a pure substance that is formed when the atoms of two or more elements combine chemically is definite proportion
The constituents can be separated easily by physical methods	The constituents can be separated only by chemical methods.

You can Download Samacheer Kalvi 7th Science Book Solutions Guide Pdf, Tamilnadu State Board help you to revise the complete Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th Science Solutions Term 2 Chapter 1 Heat and Temperature

You can Download Samacheer Kalvi 7th Science Book Solutions Guide Pdf, Tamilnadu State Board help you to revise the complete Syllabus and score more marks in your examinations.

Samacheer Kalvi 7th Science Heat and Temperature Textual Evaluation

I. Choose the correct answer:

Heat And Temperature Class 7 Samacheer Question 1.
International unit of measuring temperature is
(a) Kelvin
(b) Fahrenheit
(c) Celsius
(d) Joule
Answer:
(a) Kelvin

Heat And Temperature 7th Standard Question 2.
In thermometer when bulb comes in contact with hot object, liquid inside it
(a) expands
(b) contracts
(c) remains same
(d) none of above
Answer:
(a) expands

Heat And Temperature 7th Class Question 3.
The body temperature of a healthy man is;
(a) 0°C
(b) 37°C
(c) 98°C
(d) 100°C
Answer:
(b) 37°C

Samacheer Kalvi Guru 7th Science Question 4.
Mercury is often used in laboratory thermometers because it
(a) is a harmless liquid
(b) is silvery in colour and is attractive in appearance
(c) Expands uniformly
(d) is a low cost liquid
Answer:
(c) Expands uniformly

7th Science Heat And Temperature Question 5.
Which of the following temperature conversions is incorrect K (Kelvin) = oc ( Celsius) + 273.15

II. Fill In the blanks:

1. Doctor uses ________ thermometer to measure the human body temperature.
2. At room temperature mercury is in _______ state.
3. Heat energy transfer from _______ to _______
4. -7°C temperature is _______ than 0°C temperature.
5. The common laboratory thermometer is a _______ thermometer.

Answer:

1. clinical
2. liquid
3. hotter object, colder object
4. less
5. mercury

III. Match the following:

1. Clinical thermometer – A form of energy
2. Normal temperature of human body – 100°C
3. Heat – 37°C
4. Boiling point of water – o°c
5. Melting point of water – Kink

Answer:

1. Clinical thermometer – Kink
2. Normal temperature of human body – 37°C
3. Heat – A form of energy
4. Boiling point of water – 100°C
5. Melting point of water – 0°C

IV. Give very short answer:

7th Standard Science Heat And Temperature Question 1.
Temperature of Srinagar (J&K) is -4°C and in Kodaikanalis 3°C which of them
has greater temperature ? What is the difference between the temperatures of
these two places?
Answer:
Kodaikanal has greater temperature.
Temperature of srinagar (J &K) = -4°C
Temperature of = 3°C
Difference = -4°C + 3°C = 7°C
Srinagar is colder than that of kodaikanal.

7th Standard Heat And Temperature Question 2.
Jyothi was prepared to measure the temperature of hot water with a clinical thermometer. Is it right or wrong? Why?
Answer:
It is wrong, because clinical thermometer has small temperature range (35°C to 42°C or 94°F to 108°F). If it is used to measure the temperature of hot water, the glass will crack/ burst due to excessive pressure created by expansion of mercury.

Science 7 Heat And Temperature Question 3.
A clinical thermometer is not used to measure the temperature of air, why?
Answer:
The range of the clinical thermometer is less than that of thermometer used to measure temperature of air.

Samacheer Kalvi 7th Science Term 2 Question 4.
What is the use of kink in clinical thermometer?
Answer:
A kink is clinical thermometer prevents the mercury from flowing back into the bulb when the thermometer is taken out of the patient’s mouth, so that the temperature can be noted conveniently.

Samacheer Kalvi Guru 7th Science Book Back Answers Question 5.
Why do we jerk a clinical thermometer before we measure the body temperature?
Answer:
The jerk to the thermometer will allow the mercury level to flow into the bulb so that the mercury level is below the normal temperature.

V. Give Short Answer

Heat And Temperature Class 7 Questions And Answers Question 1.
Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?
Answer:

1. We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.
2. A small change in the temperature causes change in volume of a liquid.
3. Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C.
4. Water is transparent. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube.
5. Due to this constraints it is not used as a thermometric liquid.

Heat And Temperature Answer Key Question 2.
Swathi kept a laboratory thermometer in hot water for some time and took it out to read the temperature. Ramani said it was a wrong way of measuring temperature. Do you agree with Ramani ? Explain your answer.
Answer:
Yes, I agree with Ramani.

1. Laboratory thermometer does not have a kink. So, when Swathi takes out the thermometer, the level can go back because of absence of kink.
2. So Swathi should note the reading when the thermometer bulb has surrounded by hot water.

Question 3.
The body temperature of Srinath is 99°F. Is he suffering from fever? If so, why?
Answer:
Srinath is having a fever because the normal body temperature is 98.6°F.

VI. Give long answer:

Question 1.
Draw the diagram of a clinical thermometer and label its parts
Answer:

Question 2.
State the similarities and differences between the laboratory thermometer and the clinical thermometer.
Answer:
Similarities between laboratory thermometer and the clinical thermometer:

1. Both clinical and laboratory thermometers have long, narrow and uniform glass tubes.
2. Bulbs contain mercury.
3. Both have Celsius scale.

Differences:

Laboratory thermometer:

1. Laboratory thermometer is generally scaled from -10°C to 11 CPC.
2. Mercury level falls on its own as no kink is present.
3. Temperature is read while keeping the thermometer in the source of temperature, e.g. a liquid or any other thing.
4. No need to give jerk to lower the mercury level.
5. It is used to take temperature in laboratory.

Clinical thermometer:

1. Clinical thermometer is scaled from 35°C to 42°C or from 94°F to 108°F.
2. Mercury level does not fall on its own, as there is a kink near the bulb to prevent the fall of mercury level.
3. Temperature can be read after removing the thermometer from armpit or mouth.
4. To lower the mercury level jerks are given.
5. It is used for taking the body temperature.

VII. Higher Order Thinking questions:

Question 1.
What must be the temperature in Fahrenheit, so that it will be twice its value in Celsius?
Answer:
According to the question, F = 2C and C₁ = C
F = \(\frac { 9C }{ 5 }\) + 32
2c =\(\frac { 9 }{ 5 }\) C + 32
2c – \(\frac { 9 }{ 5 }\) c = 32 ⇒\(\frac { 10c – 9c }{ 5 }\) = 32 + 0
\(\frac { 1c }{ 5 }\) = 32

Question 2.
Answer:
Go to a veterinary doctor (a doctor who treats animals). Discuss and find out the normal temperature of domestic animals and birds.

1. Dog – 38.9°C
2. Horse – 38°C
3. Rabbit – 38.3°C
4. Cow – 38.6°C
5. Cat – 39°C
6. Goat- 39.7°C
7. Pigeon – 44.1°C
8. Crow – 40°C
9. Duck – 40.7°C
10. Karaknath – 41.8°C
11. Parrot – 41°C

Samacheer Kalvi 7th Science Heat and Temperature Intext Activites

Activity – 1

Question 1.
What is required?
A small glass bottle, a rubber cork, an empty refill, water, colour, a candle, a fork, a paper.
What to do?

• Take a small glass bottle. Fill it with coloured water.
• Make hole at the centre of the rubber cork.
• Pass empty refill from the hole of the rubber cork.

• Make the bottle air tight and observe the water raised in the refill.
• Make a scale on paper, place it behind the refill and note down the position of the surface of water.
• Hold bottle with fork and supply heat to it with candle. Then ‘ observe.

Question 2.
What is the change in the surface of water?
Answer:
The level of water increases.
Stop the supply of heat. When water is cooled, observe the surface of water in the refill,

Question 3.
what change takes place? Why?
Answer:
The level of water comes to the original position.
When, a liquid is heated, it expands and when it is cooled down, it contracts.

Activity – 2

Question 1.
What is required?
A big bottle, a balloon, threads, candle, water, fork.
What to do?

• Take one big bottle, and fill some water in it.
• Attach one balloon on the mouth of bottle and fix it with thread.
• Hold bottle with a fork. Heat the bottle with a candle and take observation.

Question 2.
What change occurs in the state of balloon after heating the bottle?
Answer:
The balloon expands.

Question 3.
What change occurs in the state of balloon after heating the bottle?
Why?
Answer:
The air inside it gets heated and expands. This causes the balloon to stretch and expand.
Now, let the bottle get cooled down.

Question 6.
What change occurs in the state of balloon after bottle gets cool down?
Why?
Answer:
The temperature within the bottle reduces causing the air to cool down. This causes the balloon to contract.
When gases substance gets heat, it expands; when it cools it contracts.

Question 5.
Why does a tyre get burst in summer?
Answer:
During summer, the air inside the tyre of a vehicle will get heated up with the increase in pressure of the air inside the tyre. As there is no place to air to escape tyre will get bursted.

Activity – 3
Measure your body temperature.
Wash the thermometer preferably with an antiseptic solution. Hold it firmly by the end and give it a few jerks. These jerks will bring the level of Mercury down. Ensure that it falls below 35°C (95°F). Now place the thermometer under your tongue or arm pit. After one minute, take the thermometer out and note the reading. It tells you your body temperature.
What did you record as your body temperature?
Answer:
37°C

1.6 Numerical problems:

3. Convert the given temperature :

Question 1.
45°C = _____ °F
Solution:
F = \(\frac { 9c }{ 5 }\) + 32
\(\frac{9 \times 45^{9}}{8}\)
= 81 +32
45°c = 113°F

Question 2.
20°C =______°F
Solution:
F =\(\frac { 9c }{ 5 }\)
= \(\frac{9 \times 20^{4}}{5}\) + 32
=36 + 32
20°c = 68°F

Question 3.
68°F =_______°F
Solution:
C = (F-32) ×\(\frac { 5 }{ 9 }\)
= (68 – 32) × \(\frac { 5 }{ 9 }\)
= 36 ×\(\frac { 5 }{ 9 }\)
68°F = 20°C

Question 4.
185°C =_______°F
Solution:
c = (F – 32) × \(\frac { 5 }{ 9 }\)
= (185 -32) × \(\frac { 5 }{ 9 }\)
= 153 × \(\frac { 5 }{ 9 }\)
185F° = 85°C

Question 5.
0°=________°F
Solution:
K = C + 273
= 0 + 273
0°C = 273K

Question 6.
– 20°=________°F
Solution:
k = C + 273
= – 20 + 273
– 20°C = 273K

Question 7.
100K=________°F
Solution:
C = K – 273
=272.15 – 273
272.15K= – 0.85°C

Samacheer Kalvi 7th Science Heat and Temperature Additional Questions

I. Choose the correct answer.

Question 1.
Heat energy is the total of the particles that make up a substance.
(a) potential energy
(b) substance
(c) temperature
(d) none
Answer:
(b) substance

Question 2.
Heat energy is always transferred from to temperatures.
(a) lower, higher
(b) higher, lower
(c) conductor, insulator
(d) both a and b
Answer:
(b) higher, lower

Question 3.
A clinical thermometer is calibrated from to .
(a) 10°Ctol00°C
(b) 32°C to 110°C
(c) 0°Ctol00°C
(d) 35°C to 42°C
Answer:
(d) 35°C to 42°C

Question 4.
The thermometer which ranger from -10°C to 110°C is .
(a) clinical thermometer
(b) digital thermometer
(c) laboratory thermometer
(d) All of these
Answer:
(c) laboratory thermometer

Question 5.
Which one of the following scale has lower fixed point at 0°C?
(a) Kelvin scale
(b) Fahrenheit scale
(c) Celsius scale
(d) All of these
Answer:
(c) Celsius scale

Question 6.
The lower fixed point on the Celsius scale is
(a) melting point of mercury
(b) melting point of ice
(c) boiling point of water
(d) none
Answer:
(b) melting point of ice

Question 7.
The measure of degree of hotness or coldness of a body is called
(a) heat energy
(b) Celsius
(c) kelvin
(d) temperature
Answer:
(d) temperature

Question 8.
Digital thermometer is widely used for the measurement of the temperature due to .
(a) Analog display
(b) Mercury
(c) High accuracy
(d) Low accuracy
Answer:
(c) High accuracy

Question 9.
Temperature of boiling water cannot be measured by a thermometer.
(a) laboratory
(b) digital
(c) clinical
(d) both b & c
Answer:
(d) both b & c

Question 10.
When a substance is heated, its temperature .
(a) rises
(b) falls
(c) remains same
(d) none
Answer:
(a) rises

II. Fill in the Blanks.

1. Digital thermometers do not use ______
2. In a thermometer, when liquid gets heat, it_____and when it is cooled down, it
3. The SI unit of temperature is ______
4. A small change in the temperature causes change in of a liquid.________
5. The freezing point of alcohol is less than________
6. All clinical thermometers have a________ that prevents mercury from flowing back into the bulb.
7. A clinical thermometer indicates temperatures from a minimum of ________ °F to a maximum of °F.
8. Before use, the mercury level in clinical thermometer should be below________
9. The coldest natural temperature ever recorded on earth is________
10. The hottest natural temperature ever recorded on earth is________
11. Temperature of the universe in the earliest moments after the big bang is ________

Answer:

1. mercury
2. expand, contact
3. kelvin
4. volume
5. – 100°
6. kink
7. 94° F,108° F
8. 35° C or 94° F
9. 178.45K
10. 392.85K
11. 10³² K

III. True or False – if false give the correct statement.

Question 1.
Temperature is related to how fast the atoms within a substance are moving.
Answer:
True

Question 2.
Mercury is a poor conductor of heat.
Answer
False. Mercury is a good conductor of heat.

Question 3.
Fahrenheit scale is more sensitive that the Celsius scale.
Answer:
True

Question 4.
In humans, the average internal temperature is 98.60°C.
Answer:
False. In humans, the average internal temperature is 98.60°F.

Question 5.
Digital thermometers are mainly used to take the body temperature.
Answer:
True

Question 6.
The glass of a clinical thermometer will burst due to excessive pressure created by contraction of mercury.
Answer:
The glass of a clinical thermometer will burst due to excessive pressure created by expansion of mercury.

Question 7.
In greek, Centium means 100 and Gradus means steps, both words make it Centigrade and later Celsius.
Answer:
True

Question 8.
Kelvin is written as K also known as absolute scale as it starts from absolute zero temperature.
Answer:
True

Question 9.
The temperatures in Celsius and in Fahrenheit will be same at -40.
Answer:
True

IV. Match the following :

Answers:

1. (c)
2. (a)
3. (d)
4. (b)

V. Assertion and Reason.
Mark the correct choice as
(a) Both A and R are true but R is the correct explanation of assertion.
(b) Both A and R are true but R is not correct explanation of assertion.
(c) A is true but R is false.
(d) A is false but R is true.

1. Assertion

(A): Heat energy is transferred from one body to another due to a temperature difference between them.
Reason (R): Heating a substance causes a rise in temperature.
Answer:
(b) Both A and R are true but R is not correct explanation of assertion.

Correct reason: Heat energy always travels from hotter object to colder objects.

1. Assertion

(A): When a very hot liquid is poured into a thick glass tumbler it cracks.
Reason (R): Unequal expansion of inner and outer glass walls causes the glass to crack.
Answer:
(a) Both A and R are true but R is the correct explanation of assertion

VI . Very short Answers:

Question 1.
Mention the three units which are used to measure the temperature.
Answer:
The three units which are used to measure the temperature: Degree Celsius, Fahrenheit and Kelvin.

Question 2.
What is the boiling point of mercury?
Answer:
357°C

Question 3.
What is the freezing point of alcohol?
Answer:
Less than -100°C

Question 4.
Mention the use of laboratory thermometers.
Answer:
To measure the temperature is laboratories for scientific research.

Question 5.
What is the average internal temperature of human body?
Answer:
37°C (98.6°F)

Question 6.
What is the freezing point of water is Fahrenheit scale?
Answer:
32°F

Question 7.
At what temperature the value will be same in Celsius and in Fahrenheit?
Answer:
– 40.

Question 8.
Name the principle which is used in thermometer.
Answer:
Liquids expand on heating and contract on cooling.

VII. Short Answer.

Question 1.
Mention any two precautions to be followed while using a clinical thermometer.
Answer:

1. The thermometer should be washed before and after use, preferably with an antiseptic solution.
2. Jerk the thermometer a few times to bring the level of the mercury down.

Question 2.
What are the uses of laboratory thermometers?
Answer:
Laboratory thermometers are used to measure the temperature in school and other laboratories for scientific research. They are also used in the industry as they can measure temperatures higher than what clinical thermometers can record.

Question 3.
Mention any two properties of alcohol.
Answer:

1. The freezing point of alcohol is less than -100°C. So it can be used to measure very low temperatures.
2. Its expansion per degree Celsius rise in temperature is very large.

Question 4.
What is the use of kink in clinical thermometers?
Answer:
Kink prevents the mercury from flowing back into the bulb when the thermometer is taken out of the patient’s mouth. So that the temperature can be noted conveniently.

Question 5.
Why mercury or alcohol is used in thermometers?
Answer:
Mostly Alcohol and Mercury are used in thermometers as they remain in liquid form even with a change of temperature in them. A small change in the temperature causes change in volume of a liquid. We measure this temperature by measuring expansion of a liquid in thermometer.

Question 6.
We are advised to avoid keeping clinical thermometer in the sun or near a flame. Why?
Answer:
A Clinical thermometer has small temperature range. The glass will crack/ burst due to excessive pressure created by expansion of mercury.

VIII. Long Answer:

Question 1.
Explains the properties of mercury.
Answer:

1. Its expansion is uniform. (For equal amounts of heat it expands by equal lengths.)
2. If is opaque and shining.
3. It does not stick to the sides of the glass tube.
4. It is a good conductor of heat.
5. It has a high boiling point (357°C) and a low freezing point (-39°C). Hence a wide range of temperatures can be measured using a mercury thermometer.

Question 2.
Explain the construction and working of clinical thermometer.
Answer:

1. Clinical thermometers are used to measure the temperature of a human body – at home, clinics and hospitals.
2. All clinical thermometers have a kink that prevents the mercury from flowing back into the bulb when the thermometer is taken out of the patient’s mouth, so that the temperature can be noted conveniently.
3. There are temperature scales on either side of the mercury thread, one in C elsius scale and the other in Fahrenheit scale.
4. Since the Fahrenheit scale is more sensitive than the Celsius scale, body temperature is measured in F only.
5. A clinical thermometer indicates temperatures from a minimum of 35°C or 94°F to a maximum of 42°C or 108°F.

Question 3.
Explain the precautions to be followed while using clinical thermometer.
Answer:

1. The thermometer should be washed before and after use, preferably with an antiseptic solution.
2. Jerk the thermometer a few times to bring the level of the mercury down.
3. Before use, the mercury level should be below 35°C or 94°F.
4. Do not hold the thermometer by its bulb.
5. Keep the mercury level along your line of sight and then take the reading.
6. Handle the thermometer with care. If it hits against some hard object, it may break.
7. Do not place the thermometer in a hot flame or in the hot sun.

Question 4.

1. Write a note on laboratory thermometer.
2. Write the precautions to be following while using a laboratory thermometer.

Answer:
(a) Laboratory Thermometers:

1. Laboratory thermometers are used to measure the temperature in school and other laboratories for scientific research.
2. They are also used in the industry as they can measure temperatures higher than what clinical thermometers can record.
3. The stem and the bulb of a lab thermometer are longer when compared to that of a clinical thermometer and there is no kink in the lab thermometer.
4. A laboratory thermometer has only the Celsius scale ranging from -10°C to 110°C.

(b) Precautions to be Followed While Using a Laboratory Thermometer:

1. Do not tilt the thermometer while measuring the temperature. Place it  upright.
2. Note the reading only when the bulb has been surrounded by the substance from all sides.

Question 5.
Explain how do you determine the temperature of hot water using laboratory thermometer?
Answer:

1. Take some water in a beaker.
2. Take a laboratory thermometer and immerse its bulb end in water; holding it vertically. Ensure to dip whole portion of bulb end. The bulb end should not touch the bottom or side of the beaker.
3. Observe the movement of rise of mercury. When it becomes stable, take the reading of the thermometer.
4. Repeat this with hot water and take the reading.

Question 6.

1. write a note on digital thermometer.
2. Mention the precaution to be followed while using digital thermometer.

Answer:
(a) Digital Thermometer:

1. Mercury is a toxic substance and is very difficult to dispose of if a thermometer breaks.
2. These days, digital thermometers are available which do not use mercury.
3. Instead, it has a sensor which can measure the heat coming out from the body directly and from that can measure the temperature of the body.
4. Digital thermometers are mainly used to take the body temperature.
5. Do not use a clinical thermometer for measuring the temperature of any object other than human body.
6. Avoid keeping it in the sun or near of flame.

Question 7.
Explain the usage of digital thermometer.
Answer:
Use of Digital thermometer:

1. Wash the tip with warm (not hot), soapy water.
2. Press the “ON” button.
3. Insert the tip of the thermometer into the mouth, bottom, or under the armpit.
4. Hold the thermometer in place until it beeps (about 30 seconds).
5. Read the display.
6. Turn off the thermometer, rinse under water, and put it away in a safe place.

IX.Problems for practice:
Convert the given temperature:

Question 1.
40°C =_______°F
Solution:
F = \(\frac { 9c }{ 5 }\) +32
\(\frac{9 \times 40^{8}}{8}\) + 32
= 72 + 32
40°C = 104°F

Question 2.
0 K =_______°F
Solution:
C = k – 273
= 0 – 273
0 K = – 273°C

Question 3.
– 30°C = _______°F
Solution:
K = C + 273
= – 30 + 273

Question 4.
150°F =_______°C
Solution:
C = (F – 32) × \(\frac { 5 }{ 9 }\)
= 118 × \(\frac { 5 }{ 9 }\)
=\(\frac { 590 }{ 9 }\) = 65.9
150°F = 65.9°C

X . Creative Questions: HOTS

Question 1.
What the minimum possible temperature is 0 k .There also a maximum possible temperature ?
Answer:
The minimum possible temperature is 0 K. There is no limit to maximum temperature.

Question 2.
Complete the table.

Answer:

1. 212°F
2. Freezing point of water
3. 273.15 K
4. 37°C
5. 23 K