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प्रश्न
Select the correct alternative
Heat in a liquid is transferred by
पर्याय
conduction
convection
radiation
conduction and radiation
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उत्तर
convection
APPEARS IN
संबंधित प्रश्न
Give two examples each of conductors and insulators of heat.
No medium is required for transfer of heat by the process of ______.
A wooden spoon is dipped in a cup of ice cream. Its other end ______.
Write true or false for a given statement.
Black surfaces are the poor absorbers of heat radiations.
Fill in the blank
A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from _______ to _________
Select the correct alternative
In the process of convection, heat travel
______ of heat does not require a medium.
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 a liquid boils, energy is absorbed.
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.
