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प्रश्न
Why are the houses in Rajasthan painted white?
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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
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that ______.
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
If we add a lump of ice to a tumbler containing water,
State the direction of heat transfer by way of convection.
Conduction of heat takes place through a ______ substance.
The earth receives heat from the sun by ______.
How does a fever get lowered by putting a cold compress on the forehead of a patient?
Heat is the transfer of energy between two objects at different temperatures.
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.
