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प्रश्न
Why do we prefer to wear white or light coloured clothes in summer and black or dark coloured clothes in winter ?
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उत्तर
We prefer to wear white clothes in summer. The reason is that the white clothes reflects most of the sun’s heat and absorb very little of the sun’s heat, thus they keep our body cool.
We prefer to wear black and dark coloured clothes in winter. The reason is that the black or dark colour clothes absorb most of the sun’s heat and keep our body warm
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संबंधित प्रश्न
Write true or false for a given statement.
Solids expand the least and gases expand the most on being heated.
Write true or false for a given statement.
A mercury thermometer makes use of the property of the expansion of liquids on heating.
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In a thermometer, the commonly used liquid is _______
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Metals are _______ of heat.
What do you understand by thermal expansion of a substance ?
Why do telephone wires sag in summer ?
Name a solid which is a good conductor of heat.
Why is a tea kettle provided with an ebonite handle?
The applied heat energy can be realized as an increase in the average kinetic energy of the molecules.
Match the following
| 1. | Solid to liquid | a. | Condensation |
| 2. | Liquid to gas | b. | Deposition |
| 3. | Gas to solid | c. | Melting |
| 4. | Gas to liquid | d. | Vaporization |
