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The figure shows the $P-V$ plot of an ideal gas taken through a cycle $ABCDA.$ The part $ABC$ is a semicircle and $CDA$ is half of an ellipse. Then,
  • AThe process during the path $A \to B$ is isothermal
  • BHeat is absorbed by the gas during the path $B\to C\to D$
  • CWork done during the path $A\to B\to C$ is zero
  • DPositive work is done by the gas in the cycle $ABCDA$
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