For which of the following processes is the relation $d Q = d U$ true ?

isobaric

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isochoric

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isothermal

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adiabatic

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Solution

The correct option is B isochoric
Using first law we see that the relation $d Q = d U$ implies that the work done is zero. Work done being $W = \int P d V$ is zero for no change in volume.

Thus, the correct answer is isochoric process.

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