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The figure shows the $P - V$ plot of an ideal gas taken through a cycle $A B C D A$ . The part $A B C$ is a semi-circle and $C D A$ is half of an ellipse. Then

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The process during the path $A \to B$ is isothermal

Heat flows out of the gas during then path $B \to C \to D$

Work done during the path $A \to B \to C$ is zero

Positive work is done by the gas in the cycle $A B C D A$

answer is B, D.

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Detailed Solution

Temperature at $B >$ temperature at $D$

$∆ U$ is negative (for $B \to C \to D$ )

Also $W$ is negative (for $B \to C \to D$ )

Tracing is clockwise on $P V$ diagram.

Total $W$ is positive. $(2)$ and $(4)$ are Correct

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