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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    An ideal gas is initially at \[{{P}_{1}}\], \[{{V}_{1}}\] is expanded to\[{{P}_{2}}\], \[{{V}_{2}}\] and then compressed adiabatically to the same volume f[ and pressure \[{{P}_{3}}\] If W is the net work done by the gas in complete process which of the following is true? 

    A) \[W>0;{{P}_{3}}>{{P}_{1}}\]

    B)        \[W<0;{{P}_{3}}>{{P}_{1}}\]

    C) \[W>0;{{P}_{3}}<{{P}_{1}}\]

    D)        \[W<0;{{P}_{3}}<{{P}_{1}}\]

    Correct Answer: B

    Solution :

    [b] In the first process W is +ve as \[\Delta V\] is \[{{P}_{3}}\]positive, in the P1 second process W is \[{{P}_{2}}\] -ve as \[\Delta V\]is \[ve\] and area under the curve of second process is more \[\therefore \] Net Work \[<0\]and also\[{{P}_{3}}>{{P}_{1}}.\]


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