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Questions  

An ideal gas is taken through the cycle ABCA as shown in fig. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process 
CA is

a
-5 J
b
-10 J
c
-15 J
d
-20 J

detailed solution

Correct option is A

For cyclic process,Qcyclic =WAB+WBC+WCAHere WAB=10(2−1)=10J,WBC=0∴ 5J=10J+0+WCA or WCA=−5J.

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