Advertisements
Advertisements
प्रश्न
Why are the houses in Rajasthan painted white?
उत्तर
White colours are reflectors of heat. Thus, Rajasthan, a very hot state, has houses with their walls painted white so that most of the heat from the sun is reflected back to the atmosphere. This keeps the houses cool from inside.
संबंधित प्रश्न
No medium is required for transfer of heat by the process of ______.
State the direction of heat transfer by way of convection.
Give one example of heat transfer by radiation.
Maximum heat is absorbed by a ______ coloured object.
How does a fever get lowered by putting a cold compress on the forehead of a patient?
Why is the outer coat of the penguins of Antarctica black?
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 |
The handles of cooking utensils are made of ______.
When ice changes into a liquid, it absorbs energy.
Take a sheet of paper. Draw a spiral on it as shown in Figure. Cut out the paper along the line. Suspend the paper as shown in Figure above a lighted candle. Observe what happens. Think of an explanation.
