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NEET Sample Paper NEET Sample Test Paper-93

  • question_answer
    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?

    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 :

    [a] In adiabatic process Heat change \[\Delta Q=0\] By first law of thermodynamics, \[\Delta Q=\Delta U+W\] \[\Rightarrow \] \[0=\Delta U+W\]\[\Rightarrow \]\[\Delta U=-W\] In isothermal process; Temperature change, \[\Delta T=0\] Change in internal energy, \[\Delta U=n{{C}_{v}}\Delta T=0\] By \[\Delta Q=\Delta U+W\]\[\Rightarrow \]\[\Delta Q=W\]


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