Advertisements
Advertisements
Question
Why are heaters fitted near the floor and air conditioners near the ceiling of a room?
Advertisements
Solution
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.
RELATED QUESTIONS
Give two examples each of conductors and insulators of heat.
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.
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.
Medium is necessary for the transfer of heat by radiation.
Fill in the blank
Heat transfer in liquids and gases is by ________.
Select the correct alternative
If we add a lump of ice to a tumbler containing water,
Why is the freezing chest in a refrigerator fitted near its top?
The earth receives heat from the sun by ______.
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.
