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Q.

Before the doctor gives an injection, he applies spirit at that site. At that time our skin feels very cool because

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a

The spirit is at low temperature.

b

The spirit kills the bacteria present on the skin.

c

The spirit evaporates using the heat from our body.

d

The spirit loses its heat when it is taken out of the bottle.

answer is C.

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Detailed Solution

When the doctor gives an injection, he applies a spirit which makes our skin feel cool because the spirit is being evaporated from our skin using our body's heat.

As our body releases heat to evaporate the spirit, the area where the spirit is applied feels cool.

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