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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2005

  • question_answer
    During the adiabatic expansion of 2 moles of a gas, the internal energy was found to have decreased by 100 J. The work done by the gas in this process is

    A)  zero                                     

    B)  - 100 J

    C)  200 J                                    

    D)  100 J

    Correct Answer: D

    Solution :

    First law of thermodynamics is \[dQ=dU+dW\] \[dQ=0,\]for adiabatic change Therefore,                 \[dW=-dU=-(-100)J\]                 \[=100J\]


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