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Q.

Wearing many layers of cotton keeps you warm because


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a

Many layers will produce heat together.

b

Trapped air acts as an insulator between layers.

c

Cotton retains moisture.

d

Cotton evaporates absorbed moisture. 

answer is B.

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Detailed Solution

Wearing many layers of cotton keeps you warm because trapped air acts as an insulator between layers.
Cotton is an important natural fibre obtained from cotton plants. Wearing many layers of cotton will keep you warm just like wool because air acts as an insulator of heat. Since cotton is a thin breezy fabric, its layers will trap more air which will not allow heat to pass and we will not feel cold. Therefore, layered clothing is advised in winters.
 
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