JCECE Medical JCECE Medical Solved Paper-2002

  • question_answer
    A number of small drops of mercury adiabatically coalesce, to form a single drop. The temperature of the drop:

    A)  increases      

    B)  remains same

    C)  decreases      

    D)  depend on size

    Correct Answer: A

    Solution :

     Key Idea: Heat neither enters nor leaves n system in an adiabatic process. From first law of thermodynamics \[\Delta U=Q-W\] where Q is the energy, W is work done and \[\Delta U\]is internal energy. In an adiabatic process Q = 0. When drop is compressed, work is done Hence,\[\Delta U=W\] Hence, internal energy increases, because of which temperature increases.


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