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प्रश्न
Give a scientific reason for the following:
On a hot sunny day, it is advisable to wear light coloured clothes.
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उत्तर
People wear light colured clothes in winter because these clothes reflect most of the sun's radiations and absorb only a little of them. Therefore, they keep themselves cool.
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संबंधित प्रश्न
Define temperature and write its S.I. unit.
Write the SI unit of coefficient of cubical expansion.
State the types of thermal expansion. What is the relation between α and γ?
What is the unit of coefficient of volume expansion?
Explain the following:
Water is heated generally from below.
Out of metals, liquids, and gases:
Which one is worst conductor of heat?
Consider the statement given below and choose the correct option.
Assertion: A system can be converted from one state to another state.
Reason: It takes place when the temperature of the system is constant.
Find the final temperature of a copper rod. Whose area of cross-section changes from 10 m2 to 11 m2 due to heating. The copper rod is initially kept at 90K. (Coefficient of superficial expansion is 0.0021 /K)
What is the minimum possible temperature? Is there also a maximum possible temperature?
