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9. An ideal gas expands isothermally from a volume

V1 to V2 and then compressed to original volume V1 adiabatically. Initial pressure is P1  and final pressure is P3 . The total work done is W. Then

(a) P3 > P1 ,W > 0               (b) P3 < P1 ,W < 0

(c) P3 > P1 ,W < 0                  (d) P3 = P1 ,W = 0

Answer-c

(10)

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