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Q.

A weather cock indicates the presence of air as


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a

It allows us to see the air

b

It shows the direction of the air

c

It changes its shape in the presence of air

d

It flies with moving air 

answer is B.

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Detailed Solution

A weather cock indicates the presence of air by showing the direction of the air.
A thin layer of air encircles the Earth. It can't be seen directly, though. Instead, there is an arrow fastened to the weathercock. A weathercock is a tool that indicates the direction in which the air is travelling at a certain location. It begins to move when the wind (moving air) is present and also reveals the direction in which the air travels.
 
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