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प्रश्न
Select the correct alternative
If we add a lump of ice to a tumbler containing water,
पर्याय
heat flows from water to ice
heat flows from ice to water
heat flows from water to ice if water is more
heat flows from ice to water if ice is more
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उत्तर
heat flows from water to ice
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संबंधित प्रश्न
Give two examples each of conductors and insulators of heat.
Write true or false for a given statement.
Medium is necessary for the transfer of heat by radiation.
Write true or false for a given statement.
Black surfaces are the poor absorbers of heat radiations.
Select the correct alternative
Heat in a liquid is transferred by
State the direction of heat transfer by way of convection.
Why is the freezing chest in a refrigerator fitted near its top?
Maximum heat is absorbed by a ______ coloured object.
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 |
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.
