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Question

Wool is used in making garments used in winter because

A
Wool is a good conductor of heat
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B
Wool is a bad conductor of heat
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C
Air, trapped in between the wool fibres, prevents the flow of heat from our body to the cold surroundings.
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D
Both B and C
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Solution

The correct option is B Both B and C
Wool is used in making garments used in winter because wool is bad conductor of heat; it insulates the body from the surrounding. And the air which is trapped in between the wool fibers; prevents the flow of heat from our body to the cool surrounding. As air is the bad conductor of heat too it also insulates the body with wool.

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