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NCERT solutions Science Class 7 chapter 4 Heat

Chapters

NCERT Science Class 7

Science Textbook for Class  7

Chapter 4 - Heat

Pages 45 - 47

State similarities and differences between the laboratory thermometer and the clinical thermometer.

Q 1 | Page 45

Give two examples each of conductors and insulators of heat.

Q 2 | Page 45

Fill in the blanks:

The hotness of an object is determined by its __ __.

Q 3.1 | Page 45

Fill in the blanks:

Temperature of boiling water cannot be measured by a __ __ thermometer.

Q 3.2 | Page 45

Fill in the blanks:

Temperature is measured in degree ___ _.

Q 3.3 | Page 45

Fill in the blanks:

No medium is required for transfer of heat by the process of ___ _.

Q 3.4 | Page 45

Fill in the blanks

A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of __ _ _.

Q 3.5 | Page 45

Fill in the blanks:

Clothes of ___ _ colours absorb heat better than clothes of light colours.

Q 3.6 | Page 45

Match the following:

Land breeze blows during summer
Sea breeze blows during winter
Dark coloured clothes are preferred during day
Light coloured clothes are preferred during night

 

Q 4 | Page 46

Discuss why wearing more layers of clothing during winters keeps us warmer than wearing just one thick piece of clothing.

Q 5 | Page 46

Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation

Q 6 | Page 46

In places of hot climate it is advised that the outer walls of houses be painted white. Explain.

Q 7 | Page 46

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

Q 8 | Page 46

An iron ball at 40°C is dropped in a mug containing water at 40°C.

The heat will

1) flow from iron ball to water.

2) not flow from iron ball to water or from water to iron ball.

3) flow from water to iron ball.

4) increase the temperature of both.

Q 9 | Page 47

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.

Q 10 | Page 47

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.

Q 11 | Page 47

NCERT Science Class 7

Science Textbook for Class  7
S