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प्रश्न
Define the term heat.
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उत्तर
The kinetic energy due to random motion of the molecules of a substance is known as its heat energy.
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संबंधित प्रश्न
Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum
Draw a labelled diagram of a thermo flask. Explain how the transfer of heat by conduction, convection and radiation is reduced to a minimum in it.
What will absorb heat?
Water
Name the SI unit of heat.
Define one calorie.
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
Analogy:
Movement of molecules:: Heat.
Heat energy:: ______.
To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.
Arrange the following in order of decreasing the expansion of heating: Steel, milk, air.
Warm air is ______.
