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Q.

In diagrams ( 1 to 4 ), variation of volume with changing pressure is shown. A gas is taken along the path ABCD. The change in internal energy of the gas will be

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a

Positive in all the cases (1) to (4)

b

Positive in cases (1),(2),(3) but zero in case (4)

c

Negative in cases (1),(2),(3) but zero in case (4)

d

zero in all the cases

answer is D.

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Detailed Solution

Internal energy is a state function hence in a cyclic process change in internal energy is zero.
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