NEET Sample Paper NEET Sample Test Paper-14

  • question_answer A gas is taken along the path as shown in the figure. If heat supplied to the system is 20 J, then the change in the internal energy is

    A)  125 J                         

    B)  -10 J

    C)  10 J               

    D)  55 J

    Correct Answer: A

    Solution :

    Here, V - P curve is given and not P - V. \[W=-\frac{1}{2}[30+40\times {{10}^{3}}]\times 3\times {{10}^{-3}}=-105\,J\] Work is negative because the volume is decreasing From\[dQ=dU+dW\] \[\Rightarrow \]\[dU=(20+105)J=125\,J\] Hence, the correction option is [a].

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