JCECE Engineering JCECE Engineering 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 a 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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