CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2010

  • question_answer
    Based on the first law of thermodynamics, which one of the following is correct?

    A) For an isochoric process \[=\Delta E=-q\]

    B) For an adiabatic process \[=\Delta E=-w\]

    C) For an isothermal process \[=q=+w\]

    D) For a cyclic process \[q=-w\]

    Correct Answer: D

    Solution :

    First law of Thermodynamics is                 \[\Delta E=Q+W\]  For isochoric process, \[\Delta V=0\]                                 \[w=p\Delta V=0\] \[\therefore \]                  \[\Delta E=Q\]  For adiabatic process, \[Q=0\]                                                 \[\Delta E=W\]  For isothermal process, \[\Delta T=0\] and                        \[\Delta E=0\]                                 \[Q=-W\]  For cyclic process, state functions like                                 \[\Delta E=0\]                                 \[Q=-W\]


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