BHU PMT BHU PMT (Screening) Solved Paper-2009

  • question_answer
    When a van der Waals' gas undergoes free expansion then its temperature

    A)  decreases

    B)  increases

    C)  does not change

    D)  depends upon the nature of the gas

    Correct Answer: A

    Solution :

                     van der Waals' gases are real gases and whenever a real gas undergoes free expansion, it releases heat. Hence due to loss of heat its temperature decreases.


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