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Question

In a given process for an ideal gas, dW=0 and dQ<0, then for the gas:

A
The volume will decrease
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B
The volume will increase
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C
The pressure will remain constant
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D
The internal energy will decrease
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Solution

The correct option is D The internal energy will decrease
From the First law of thermodynamics,
dU=dQ+dW
dQ<0 and dW=0dU<0
Hence, internal energy decreases.

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