JEE Main & Advanced Physics Thermodynamical Processes Question Bank First Law of Thermodynamics

  • question_answer
    A thermodynamic system goes from states (i) \[{{P}_{1}}\], V to \[2{{P}_{1}}\], V (ii) P, V to P, 2V. Then work done in the two cases is [MP PMT 1990]

    A)            Zero, Zero                             

    B)            Zero, \[P{{V}_{1}}\]

    C)            \[P{{V}_{1}}\], Zero          

    D)            \[P{{V}_{1}},\ {{P}_{1}}{{V}_{1}}\]

    Correct Answer: B

    Solution :

                       (i) Case \[\to \]Volume = constant \[\Rightarrow \int_{{}}^{{}}{PdV}=0\]            (ii) Case\[\to \]P = constant \[\Rightarrow \int_{\,{{V}_{1}}}^{\,2{{V}_{1}}}{PdV}=P\int_{\,{{V}_{1}}}^{\,2{{V}_{1}}}{dV=P{{V}_{1}}}\]


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