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4. The P-V diagram shows seven curved paths (connected by vertical paths) that can be followed by a gas. Which two of them should be parts of a closed cycle if the net work done by the gas is to be at its maximum value

(a)  ac

(b)  cg

(c)   af

(d)  cd

Explanation-(c) Area enclosed between a and f is maximum. So work done in closed cycles follows a and f is maximum.

(114)

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