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AMU Medical AMU Solved Paper-2010

  • question_answer
    During an adiabatic expansion, the increase in volume is associated with which of the following possibilities w.r.t. pressure and temperature?

    A) Pressure                              Temperature  increase              increase

    B)  decrease            decrease

    C)  increase              decrease

    D)  decrease            increase

    Correct Answer: B

    Solution :

                     According to first law of thermodynamics                 \[\Delta Q=\Delta U+\Delta W\] For an adiabatic process                 \[\Delta Q=0\] \[\therefore \]  \[\Delta U=-W\] In adiabatic process                                 \[p\propto \frac{1}{{{V}^{\gamma }}}\] and \[T\propto \frac{1}{{{V}^{\gamma -1}}}\] \[\gamma >1\], because volume increases. Then, p and T will decrease.


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