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Question

An ideal gas is initially at P1,V1 is expanded to P2,V2 and then compressed adiabatically to the same volume V1 and pressure P3. If W is the net work done by the gas in the complete process, which of the following is true?

A
W>0;P3>P1
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B
W<0;P3>P1
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C
W>0;P3<P1
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D
W<0;P3<P1
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Solution

The correct option is B W<0;P3>P1
In the first process W is +ve as V is +ve, in the second process W is ve as V is ve and area under the curve of second process is more. Therefore, the net work <0 and also P3>P1.
1572196_50447_ans_11cbb54c7c944e59ab4cad1a91e5d40f.jpg

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