2. Solved Papers
  3. BCECE Medical

BCECE Medical BCECE Medical Solved Papers-2005

  • question_answer
    The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from \[A\to B\to C\] is 30 J, and 40 J heat is given to the system. The change in internal energy between A and C is :

    A)  10 J           

    B)  70 J

    C)  84 J           

    D)  134 J

    Correct Answer: A

    Solution :

    Since, work is done by the system, so it is positive. Therefore,                 \[\Delta W=30\,J\] Heat given to the system,                 \[\Delta Q=40\,J\] According to first law of thermodynamics, change in internal energy is given by \[\Delta U=\Delta Q-\Delta W\] = 40 - 30 = 10 J


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