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The weight of an aeroplane flying in air...

The weight of an aeroplane flying in air is balanced by

A

Up thrust of the air which will be equal to the weight of the air having the same volume as the plane

B

Force due to the pressure difference between the upper and lower surfaces of the wings, created by different air speed on the surface

C

Vertical component of the thrust created by air currents strinking the lower surface of the wings

D

Force due to the reaction of gases ejected by the revolving propeller

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The correct Answer is:
A
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