||Exercise Question Answer||CLASS -7th SCIENCE||CHAPTER -3

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In this Vedio solved Complete EXERCISE with Explanation hindi& English language

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1. State similarities and differences between the laboratory thermometer
and the clinical thermometer.
2. Give two examples each of conductors and insulators of heat.
3. 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.
4. Match the following :
(i) Land breeze blows during (a) summer
(ii) Sea breeze blows during (b) winter
(iii) Dark coloured clothes are preferred during (c) day
(iv) Light coloured clothes are preferred during (d) night
5. Discuss why wearing more layers of clothing during winter keeps us
warmer than wearing just one thick piece of clothing .
6. Look at Fig. 3.13. Mark where the heat is being transferred by
conduction, by convection and by radiation.
7. In places of hot climate it is advised that the outer walls of houses be
painted white. Explain.
8. 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
9. An iron ball at 40°C is dropped in a mug containing water at 40°C.
The heat will
(a) flow from iron ball to water.
(b) not flow from iron ball to water or from water to iron ball.
(c) flow from water to iron ball.
(d) increase the temperature of both.
10. 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.
11. 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.
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