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

  • question_answer
    In the P-V diagram, I is the initial state and F is the final state. The gas goes from I to F by (i) IAF, (ii) IBF, (iii) ICE The heat absorbed by the gas is

    A) the same in all three processes

    B) the same in (i) and (ii)

    C) greater in (i) than in (ii)

    D) the-same in (i) and (iii)

    Correct Answer: C

    Solution :

    [c] Heat absorbed in a thermodynamic process is given by \[\Delta Q=\Delta U+\Delta W.\] Here \[\Delta U\] is same for all the three processes as it depends only on initial and final states. But \[\Delta {{W}_{I}}=+ve,\Delta {{W}_{II}}=0,\Delta {{W}_{III}}=-ve\] \[\therefore \Delta {{Q}_{I}}>\Delta {{Q}_{II}}\]


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