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7. A thermodynamic system goes from states

(i) P1 , V to 2P1 , V (ii) P1, V to P, 2V. Then work done in the two cases is

(a)  Zero, Zero                          (b) Zero, PV1

(c) PV1  , Zero                          (d)  PV1, P1 V1

Ans. b

(11)

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