2. Solved Papers
  3. BCECE Engineering

BCECE Engineering BCECE Engineering Solved Paper-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 \[\Delta U=\Delta Q-\Delta W\] \[=40-30=10\,J\]


You need to login to perform this action.
You will be redirected in 3 sec spinner