Which of the following is a reason for using woolen clothes in Winter ?
Wool is an insulator of heat.
It traps a layer of air in its fabric.
Air being an insulator doesn't allow body heat to escape into the atmosphere.
All the above
A
All the above
B
Wool is an insulator of heat.
C
It traps a layer of air in its fabric.
D
Air being an insulator doesn't allow body heat to escape into the atmosphere.
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Solution
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Reason behind using woolen clothes during winter is that wool is a bad conductor of heat, it insulates the body from the surrounding.
Also, Woolen clothes have fine pores filled with air such that it is trapped between our body and the clothes. And the air which is trapped between woolen fabrics, prevents the flow of heat from the body as air is a bad conductor of heat too.
Hence, option D , i.e. all the options are correct.
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