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प्रश्न
______ of heat does not require a medium.
विकल्प
radiation
white
conduction
blue
convection
bad conductor
good conductor
black
reflection
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उत्तर
Convection of heat does not require a medium.
Explanation:
In convection, when the temperature of a substance increases due to heat, its molecules move faster, causing them to rise. As a result, cooler and denser objects sink to the bottom. This process is possible only when a substance (liquid or gas) is present, as it requires the mobility and movement of molecules.
संबंधित प्रश्न
Write true or false for a given statement.
On touching a lump of ice, we feel cold because some heat passes from our body to the ice.
Write true or false for a given statement.
Liquids are heated by conduction and radiation.
Fill in the blank
Heat transfer in solids is by ______
Fill in the blank
Heat transfer in liquids and gases is by ________.
Select the correct alternative
Heat in a liquid is transferred by
Maximum heat is absorbed by a ______ coloured object.
Why are the houses in Rajasthan painted white?
What are the modes of heat transfer?
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.
