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A piston of mass m can move without fric...

A piston of mass m can move without friction in a uniform closed cylinder at one end. A gas is enclosed in it. For this situation mark the correct statement(s)

A

Pressure of the gas will be equal to that of the surrounding if axis is not horizontal

B

Pressure of the gas may be equal to that of surrounding if axis of the cylinder is not horizontal

C

Pressure of the gas may be less than that of surrounding if axis of the cylinder is not horizontal

D

Pressure of the gas cannot be less than that of the surrounding, if axis of the cylinder is not horizontal

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