A diathermic piston free to move without friction divides an adiabatic cylinder in two equal parts. The two parts contain equal amount of ideal gas. Piston is joined to string which comes out passing through tight boundary. [Assume that no matter and energy flows through hole that passes the string]. Now the string is pulled slowly to right.

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internal energy of gas A increases

Temperature of gas B increases

work done by gas A is positive

Temperature of gas A decreases

answer is B, C, D.

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Detailed Solution

[A and B are always at same temperature as piston is diathermic]. For whole gas system $Δ Q, = 0, Δ W = - V e$ [as work done by gas in right is more –ve than +ve work done by gas in left) $\Rightarrow Δ U = + V e$

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