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प्रश्न
A circular metal loop is heated at point O as shown in the following figure.
- In which direction would heat flow in the loop?
- In which order are the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
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उत्तर
- The heat will flow in both directions, i.e., from O to P and O to R.
- At first the pins at R and P will fall simultaneously followed by the pin at Q.
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संबंधित प्रश्न
Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum
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Soil
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Write scientific reason.
In the cold regions, snow falls in winter.
If you apply some heat energy to a substance, which of the following can take place in it?
Ice is kept in a double-walled container. Why?
We can absorb heat by rubbing two surfaces of some substances.
Analogy:
Movement of molecules:: Heat.
Heat energy:: ______.
On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. why?
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 |
