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NEET Physics Thermodynamical Processes NEET PYQ-Thermodynamical Processes

  • question_answer
    We consider a thermodynamic system. If \[\Delta U\] represents the increase in its internal energy and W the work done by the system, which of the following statements is true?           [AIPMT 1998]

    A)  \[\Delta U=-W\] in an adiabatic process     

    B)  \[\Delta U=W\] in an isothermal process

    C)  \[\Delta U=-W\] in an isothermal process

    D)       \[\Delta U=W\] in an adiabatic process

    Correct Answer: A

    Solution :

    An isothermal process is a constant temperature process. In this process, \[T=\] constant or\[\Delta T=0\].
                \[\therefore \]      \[\Delta U=n{{C}_{v}}\,\Delta T=0\]
                An adiabatic process is defined as one with no heat transfer into or out of a system. Therefore, \[Q=0\]. From the first law of thermodynamics.
                \[W=-\Delta U\]
    or         \[\Delta U=-W\]


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