JEE Main & Advanced Physics Thermodynamical Processes Question Bank Adiabatic Process

  • question_answer
    When a gas expands adiabatically                     [CPMT 1990]

    A)            No energy is required for expansion

    B)            Energy is required and it comes from the wall of the container of the gas

    C)            Internal energy of the gas is used in doing work

    D)            Law of conservation of energy does not hold

    Correct Answer: C

    Solution :

                       \[\Delta Q=\Delta U+\Delta W=0\] Þ \[\Delta W=-\Delta U\]            if \[\Delta W\] is positive i.e., gas does work then \[\Delta U\] should be negative meaning internal energy is used in doing work.


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