NCERT Solutions for Class 7 Science Chapter 3 Heat
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Book Name: Science
Subject: Science
Chapter Number: 4
Chapter Name: Heat
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Book Name: Science
Subject: Science
Chapter Number: 4
Chapter Name: Heat
You can also bookmark this page by clicking + Save to Library icon and refer to these NCERT Solutions anytime from your account. More Detail
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NCERT Solutions for Class 7 Science Chapter 3 Heat – Text
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Page 1
NCERT
SOLUTIONS
CLASS - 7TH
aglase .co
SOLUTIONS
CLASS - 7TH
aglase .co
Page 2
Book : Science Ncert Solutions | Chapter-4 Science
Class : 7th
Subject : Science
Chapter : 4
Chapter Name : Heat
Q1 State similarities and differences between the laboratory thermometer and the clinical
thermometer.
Answer. Similarities:
(i) Both clinical and laboratory thermometers have long, narrow, uniform glass tubes.
(ii) The bulbs of both the thermometers have mercury in them.
Differences:
(i) The temperature range of clinical thermometers is from 35 C to 42 C while that of laboratory
∘ ∘
thermometer is from —10 C to 100 C.
∘ ∘
(ii) Clinical thermometer is used to measure the temperature of a human body.
However, laboratory thermometer cannot be used to measure the temperature of a human body.
(iii) The least count of both the thermometers differs.
(iv) Unlike clinical thermometer that can be tilted, laboratory thermometer is kept upright while
reading the temperature values.
Page : 45 , Block Name : Exercise
Q2 Give two examples each of conductors and insulators of heat.
Answer. Two examples of conductors of heat are:
(i) Aluminium
(ii) Iron
Two examples of insulators of heat are:
(i) Wood
(ii) Plastic
Page : 45 , Block Name : Exercise
Q3 Fill in the blanks :
(a) The hotness of an object is determined by its __________.
(b) Temperature of boiling water cannot be measured by a _____________ thermometer.
(c) Temperature is measured in degree ______________.
(d) No medium is required for transfer of heat by the process of __________.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the
process of ______________.
(f ) Clothes of ______________ colours absorb more heat better than clothes of light colours.
Answer: (a) The hotness of an object is determined by its temperature.
Page 1 of 4 Wonderland Aglasem Schools
Class : 7th
Subject : Science
Chapter : 4
Chapter Name : Heat
Q1 State similarities and differences between the laboratory thermometer and the clinical
thermometer.
Answer. Similarities:
(i) Both clinical and laboratory thermometers have long, narrow, uniform glass tubes.
(ii) The bulbs of both the thermometers have mercury in them.
Differences:
(i) The temperature range of clinical thermometers is from 35 C to 42 C while that of laboratory
∘ ∘
thermometer is from —10 C to 100 C.
∘ ∘
(ii) Clinical thermometer is used to measure the temperature of a human body.
However, laboratory thermometer cannot be used to measure the temperature of a human body.
(iii) The least count of both the thermometers differs.
(iv) Unlike clinical thermometer that can be tilted, laboratory thermometer is kept upright while
reading the temperature values.
Page : 45 , Block Name : Exercise
Q2 Give two examples each of conductors and insulators of heat.
Answer. Two examples of conductors of heat are:
(i) Aluminium
(ii) Iron
Two examples of insulators of heat are:
(i) Wood
(ii) Plastic
Page : 45 , Block Name : Exercise
Q3 Fill in the blanks :
(a) The hotness of an object is determined by its __________.
(b) Temperature of boiling water cannot be measured by a _____________ thermometer.
(c) Temperature is measured in degree ______________.
(d) No medium is required for transfer of heat by the process of __________.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the
process of ______________.
(f ) Clothes of ______________ colours absorb more heat better than clothes of light colours.
Answer: (a) The hotness of an object is determined by its temperature.
Page 1 of 4 Wonderland Aglasem Schools
Page 3
Book : Science Ncert Solutions | Chapter-4 Science
(b) Temperature of boiling water cannot be measured by a clinical thermometer.
(c) Temperature is measured in degree Celsius.
(d) No medium is required for transfer of heat by the process of radiation.
(e) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process
of conduction.
(f) Clothes of dark colours absorb heat better than clothes of light colours.
Page : 46 , Block Name : Exercise
Q4 Match the following :
Answer.
Page : 46 , Block Name : Exercise
Q5 Discuss why wearing more layers of clothing during winters keeps us warmer than wearing just
one thick piece of clothing.
Answer. During winters, we prefer wearing more layers of clothing than just one thick piece of
clothing because air gets trapped in between the various clothing layers. Being a poor conductor of
heat, air prevents heat loss from our body. Hence, layers of clothing keep us warmer than a single
layer.
Page : 46 , Block Name : Exercise
Q6 Look at Fig Mark where the heat is being transferred by conduction, by convection and by
radiation
Page 2 of 4 Wonderland Aglasem Schools
(b) Temperature of boiling water cannot be measured by a clinical thermometer.
(c) Temperature is measured in degree Celsius.
(d) No medium is required for transfer of heat by the process of radiation.
(e) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process
of conduction.
(f) Clothes of dark colours absorb heat better than clothes of light colours.
Page : 46 , Block Name : Exercise
Q4 Match the following :
Answer.
Page : 46 , Block Name : Exercise
Q5 Discuss why wearing more layers of clothing during winters keeps us warmer than wearing just
one thick piece of clothing.
Answer. During winters, we prefer wearing more layers of clothing than just one thick piece of
clothing because air gets trapped in between the various clothing layers. Being a poor conductor of
heat, air prevents heat loss from our body. Hence, layers of clothing keep us warmer than a single
layer.
Page : 46 , Block Name : Exercise
Q6 Look at Fig Mark where the heat is being transferred by conduction, by convection and by
radiation
Page 2 of 4 Wonderland Aglasem Schools
Page 4
Book : Science Ncert Solutions | Chapter-4 Science
Answer. (i) Transfer of heat from burner to pan is by radiation.
(ii) Transfer of heat from pan to water is by conduction.
(iii) Transfer of heat within water is by convection.
Page : 46 , Block Name : Exercise
Q7 In places of hot climate it is advised that the outer walls of houses be painted white. Explain.
Answer. In places of hot climate, it is advised to paint the outer walls of houses as white
because a light colour such as white re ects back most of the heat that falls on it. Hence, a light
colour tends to keep the house cool.
Page : 46 , Block Name : Exercise
Q8 One litre of water at 30 C is mixed with one litre of water at 50 C. The temperature of the
∘ ∘
mixture will be
(a)80 C
∘
(b) more than 50 C but less than 80 C
∘ ∘
(c) 20 C
∘
(d) between 30 C and 50 C
∘ ∘
Answer. (d) The temperature of the mixture will be between 30 C and 50 C.
∘ ∘
Page : 46 , Block Name : Exercise
Q9 An iron ball at 400C is dropped in a mug containing water at 400C.
The heat will
(a) ow from iron ball to water.
(b) not ow from iron ball to water or from water to iron ball.
(c) ow from water to iron ball.
(d) increase the temperature of both.
Answer. (b) The heat will not ow from iron ball to water or from water to iron ball as both the
substances have
Page : 47 , Block Name : Exercise
Page 3 of 4 Wonderland Aglasem Schools
Answer. (i) Transfer of heat from burner to pan is by radiation.
(ii) Transfer of heat from pan to water is by conduction.
(iii) Transfer of heat within water is by convection.
Page : 46 , Block Name : Exercise
Q7 In places of hot climate it is advised that the outer walls of houses be painted white. Explain.
Answer. In places of hot climate, it is advised to paint the outer walls of houses as white
because a light colour such as white re ects back most of the heat that falls on it. Hence, a light
colour tends to keep the house cool.
Page : 46 , Block Name : Exercise
Q8 One litre of water at 30 C is mixed with one litre of water at 50 C. The temperature of the
∘ ∘
mixture will be
(a)80 C
∘
(b) more than 50 C but less than 80 C
∘ ∘
(c) 20 C
∘
(d) between 30 C and 50 C
∘ ∘
Answer. (d) The temperature of the mixture will be between 30 C and 50 C.
∘ ∘
Page : 46 , Block Name : Exercise
Q9 An iron ball at 400C is dropped in a mug containing water at 400C.
The heat will
(a) ow from iron ball to water.
(b) not ow from iron ball to water or from water to iron ball.
(c) ow from water to iron ball.
(d) increase the temperature of both.
Answer. (b) The heat will not ow from iron ball to water or from water to iron ball as both the
substances have
Page : 47 , Block Name : Exercise
Page 3 of 4 Wonderland Aglasem Schools
Page 5
Book : Science Ncert Solutions | Chapter-4 Science
Q10 A wooden spoon is dipped in a cup of ice cream. Its other end
(a) becomes cold by the process of conduction.
(b) becomes cold by the process of convection.
(c) becomes cold by the process of radiation.
(d) does not become cold.
Answer. (d) Its other end does not become cold as wood is a bad conductor of heat.
Page : 47 , Block Name : Exercise
Q11 Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
(a) copper bottom makes the pan more durable.
(b) such pans appear colourful.
(c) copper is a better conductor of heat than the stainless steel.
(d) copper is easier to clean than the stainless steel.
Answer. (c) copper is a better conductor of heat than the stainless steel.
Page : 47 , Block Name : Exercise
Page 4 of 4 Wonderland Aglasem Schools
Q10 A wooden spoon is dipped in a cup of ice cream. Its other end
(a) becomes cold by the process of conduction.
(b) becomes cold by the process of convection.
(c) becomes cold by the process of radiation.
(d) does not become cold.
Answer. (d) Its other end does not become cold as wood is a bad conductor of heat.
Page : 47 , Block Name : Exercise
Q11 Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
(a) copper bottom makes the pan more durable.
(b) such pans appear colourful.
(c) copper is a better conductor of heat than the stainless steel.
(d) copper is easier to clean than the stainless steel.
Answer. (c) copper is a better conductor of heat than the stainless steel.
Page : 47 , Block Name : Exercise
Page 4 of 4 Wonderland Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 7 |
| Type | Solution |
| Pages | 5 |
| Updated | 30 Apr 2026 |