A piston of mass \( m \) can move without friction in a uniform cyl...

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A piston of mass \( m \) can move without friction in a uniform cylinder, closed at one end. A gas is enclosed in it. Then :
\( \mathrm{P} \)
(A) Pressure of the gas will be equal to that of the surrounding
W 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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