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For proper ventilation of building, wind...

For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

A

In more air

B

In cool air near the bottom and hot air out near the roof

C

In hot air near the roof and cool air out near the bottom

D

Out hot air near the roof

Text Solution

Verified by Experts

The correct Answer is:
B
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