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Q.

A fan produces a feeling of comfort because

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a

A fan supplies cool air

b

Due to evaporation of sweat

c

Fan cools the air

d

Fan increases the humidity in air

answer is B.

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Detailed Solution

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Fan keeps pushing the air near our body. Air, though a bad conductor of heat, absorbs heat from our body. Fan pushes this part of air, and next set of air molecules rush in to replace the pushed ones. These newly-arriving molecules absorb heat from our body and are also pushed away by the fan. This process repeats.

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