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JCECE Engineering JCECE Engineering Solved Paper-2006

  • question_answer
    If energy is supplied to a gas is ochorically, increase in internal energy is \[dU\] then:

    A) \[dQ=dU+dW\]

    B) \[dQ=dU-dW\]

    C)  \[dQ=dU\]                        

    D)  \[dQ=-dU\]

    Correct Answer: C

    Solution :

    Key Idea: In isochoric process, volume is constant. Work done\[=P\Delta V\], where \[P\] is pressure, \[\Delta V\] the change in volume. For an isochoric process\[\Delta V=0\], Therefore           \[dW=PdV=0\] From first law of thermodynamics                 \[dQ=dU+dW\] where   \[dW=0\] \[\therefore \]  \[dQ=dU\]


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