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Q.

A gas is compressed at a constant pressure of 50 N/m2 from volume of 10 m3 to a volume of 4 m3 . Energy of 100 J is then added to the gas by heating. Its internal energy is

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a

increased by 400 J

b

increased by 200 J

c

increased by 100 J

d

decreased by 200 J

answer is A.

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Detailed Solution

Work done =P dV ∴ dW=50×(4−10)=−300JNow dQ = dU + dW∴ dU=dQ−dW=100+300=400JEnergy is increased by 400 J.
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