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प्रश्न
Fill in the blank
Heat transfer in solids is by ______
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उत्तर
Heat transfer in solids is by conduction.
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संबंधित प्रश्न
No medium is required for transfer of heat by the process of ______.
Write true or false for a given statement.
Black surfaces are the poor absorbers of heat radiations.
Explain briefly the process of heat transfer by radiation.
Give one example of heat transfer by radiation.
Maximum heat is absorbed by a ______ coloured object.
Why are the houses in Rajasthan painted white?
Match the items in column-I to the items in column-II
| Column-I | Column-II | ||
| 1. | Linear expansion | (a) | change in volume |
| 2. | Superficial expansion | (b) | hot body to cold body |
| 3. | Cubical expansion | (c) | 1.381 X 10-23 JK-1 |
| 4. | Cubical expansion | (d) | change in length |
| 5. | Boltzmann constant | (e) | change in area |
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When ice changes into a liquid, it absorbs energy.
Take two similar transparent glass bottles having wide mouths. Put a few crystals of potassium permanganate or pour a few drops of ink in one bottle. Fill this bottle with hot water. Fill the other bottle with cold water. Cover the cold water bottle with a thick piece of paper such as a postcard. Press the postcard firmly with one hand and hold the bottle with the other hand. Invert the bottle and place it on top of the hot water bottle. Hold both the bottles firmly. Ask some other person to pull the postcard. Observe what happens. Explain.
