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.
(124)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)