Advertisements
Advertisements
Question
Why are the houses in Rajasthan painted white?
Advertisements
Solution
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.
RELATED QUESTIONS
Give two examples each of conductors and insulators of heat.
No medium is required for transfer of heat by the process of ______.
Explain briefly the process of heat transfer by radiation.
______ of heat does not require a medium.
Conduction of heat takes place through a ______ substance.
What are the modes of heat transfer?
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 ______.
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.
