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AMU Medical AMU Solved Paper-1995

  • question_answer
    A system in going from\[i\]to\[f\]via a, as shown in the figure, does work of 30 cal and absorbs 40 cal heat. In going from\[f\]to\[i\]along the curved path, work done is\[-5\text{ }cal\]and the heat absorbed in cal, is

    A)  \[-15\]              

    B)  \[+15\]

    C)  \[+5\]               

    D)  \[-5\]

    Correct Answer: C

    Solution :

    : Internal energy\[(dU)\]remains constant as long as the temperature of system remains constant. In first case, \[dQ=dW+dU\] or \[40=30+dU\] or \[dU=10\text{ }cal\].         In second case, \[dQ=dW+dU=-5\text{ }+10=5\text{ }cal\].


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