Thermo + Ideal Gas!

There is a sample of air at standard conditions in the vertical cylinder shown in the figure. The piston moves without friction and its mass is same as that of the pan on the other side of the pulley. Some fixed amount of sand is slowly poured either to the top of the piston or into the pan. The temperature remains the same. Then :

(A) Displacement of the piston will be greater if sand is poured in the pan

(B) Displacement of the piston will be greater if sand is poured on to the top of the piston.

(C) Displacement of the piston will be same in both cases

(D) Displacement of piston is greater or lesser in any case, will depend on the initial volume & pressure of the gas

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