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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Graphical Questions

  • question_answer
    The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from A ® B ® C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is                                                                       [UPSEAT 2002]

    A)            34 J

    B)            70 J                                           

    C)            84 J                                           

    D)            134 J

    Correct Answer: D

    Solution :

                       Heat given DQ \[=20\,cal=20\times 4.2\,=84\,J\].                              Work done DW = ? 50 J       [As process is anticlockwise]                    By first law of thermodynamics  Þ \[\Delta U=\Delta Q-\Delta W=84-(-\,50)\,=134J\]


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