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Q.

Is it true that the wet khus-khus screen hung at the door keeps the room cool?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
A wet khus-khus screen hung at the door kept the room cool because evaporation causes cooling. The wet khus-khus can pass air from itself, acts as a sponge, and holds water. Evaporation is an endothermic process, and hence when water evaporates using the heat present in the surrounding air, the air in the room loses its heat and the room becomes cool.   
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