When the wind blows at a high speed, the roof of a house is blown off because :

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The wind pushes off the roof

Pressure above the roof increases

the pressure under the roof increases

Pressure above the roof decreases

answer is C.

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Detailed Solution

The pressure above a roof decreases when swift winds blowing over it.
Pressure will decrease more rapidly as speed increases. In comparison to the pressure above the roof, the air pressure below the roof is higher.
The ceiling is forced upward by this pressure difference.
Because of this, when high-speed winds start to blow, the roofs of the huts are blown off.

Hence the correct answer is Pressure above the roof decreases.

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