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NEET Sample Paper NEET Sample Test Paper-57

  • question_answer
    An ideal gas is taken through the cycle \[A\to B\to C\to A\], as shown in figure. If the net heat supplied to the gas in the cycle is 5J, th work done by the gas in process \[C\to A\]

    A) - 5J                              

    B) - 10J     

    C) - 15J                            

    D) - 20J

    Correct Answer: A

    Solution :

    [a] Process is cyclic, \[\Delta \,U=0\] Total work done \[{{W}_{AB}}+{{W}_{BC}}+{{W}_{CA}}\] Ist law of thermodynamic \[{{W}_{AB}}=P\Delta V=10(2-1)=10J\] \[{{W}_{BC}}=P\Delta V=0\] \[\Delta Q=\Delta U+W\] \[5J=10+0+{{W}_{CA}}\] \[{{W}_{CA}}=-\,5J\] Note W= +ve clockwise W= -ve anticlockwise Q= +ve heat ab- sorbed Q=-ve heat released


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