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प्रश्न
Name the three modes of transfer of heat.
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उत्तर
There are three modes of transfer of heat (i) Conduction (ii) Convection (iii) Radiation.
- Conduction: “Is that mode of transfer of heat, when heat travels from hot end to cold end from particle to particle of the medium, without actual movement of particles.”
- Convection: “Is a process of transfer of heat by actual move-ment of the medium particles.”
- Radiation: “Is that mode of transfer of heat in which heat directly passes from one body to the other body without heating the medium.”
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संबंधित प्रश्न
What is heat ? State its S.I. unit.
Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum
Fill in the blank and rewrite the sentence.
If objects of equal masses are given equal heat, their final temperature will be different. This is due to difference in their ................. .
What will absorb heat?
Iron griddle (tava)
Which temperature segment is chosen when determining the unit of heat? Why?
______ is a form of energy.
Analogy:
Movement of molecules:: Heat.
Heat energy:: ______.
A marble tile would feel cold as compared to a wooden tile on a winter morning because the marble tile ______.
Observe the picture given in figure. Water is being boiled in a pan of wide base.
- Which position P or T will feel warmer?
- Fill up the boxes P and T to indicate the mode of flow of heat to the hand.
Match the following:
| Column A | Column B | ||
| 1. | Heat | a. | Heat gained or lost in the change of state without any change in temperature |
| 2. | m × L. | b. | Heat gained or lost when there is no change of state |
| 3. | Temperature | c. | Form of energy |
| 4. | m × s × t | d. | SI unit of specific latent heat |
| 5. | J/Kg | e. | degree of hotness or coldness |
