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Haryana PMT Haryana PMT Solved Paper-2005

  • question_answer
    One mole of an ideal gas is compressed adiabatically, Its internal energy will :

    A)  decrease

    B)  increase

    C)  remain same

    D)  first Increase then decrease

    Correct Answer: C

    Solution :

                    When a gas is under adiabatic compression, then\[dU+P(-dV)=0\]    (\[\because \] \[dQ=0\])                 \[\Rightarrow \]               \[dU=PdV\]which is positive. So, internal energy will increase.                          


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