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प्रश्न
Why are heaters fitted near the floor and air conditioners near the ceiling of a room?
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उत्तर
Room heaters are fitted near the floor because this allows the hot air near the heater to rise up and warm the entire room.
The air conditioners are fitted near the ceiling so that the cold air from the AC takes the place of hot air rising up from the bottom. In this way, the entire room gets cooled.
संबंधित प्रश्न
No medium is required for transfer of heat by the process of ______.
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.
A wooden spoon is dipped in a cup of ice cream. Its other end ______.
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that ______.
Write true or false for a given statement.
Liquids are heated by conduction and radiation.
Give one example of heat transfer by radiation.
Conduction of heat takes place through a ______ substance.
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 |
When a liquid boils, energy is absorbed.
