EASY
7th ICSE
IMPORTANT
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In the CGS system, heat is expressed in joules.

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Important Questions on Heat

EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 2
Sometimes our sense of touch is not reliable in telling us whether an object is really hot or cold.
EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 3
Laboratory thermometer is also called as Doctor's thermometer.
EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 4
A laboratory thermometer has no kink.
EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 5
Digital thermometers have mercury.
EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 6
The decrease in size of an object on cooling, is called expansion.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 7

Air expands on heating.

EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 8
Wool is a poor conductor of heat due to which woollen clothes stop the flow of heat from our warm body to the cold surroundings.
EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 5 - Heat>EXERCISES>Q 9
The silvering of the wall of thermos flask minimises the heat loss by radiation.