JEE Main & Advanced Physics Thermodynamical Processes Question Bank Topic Test - Thermodynamical Process (2021)

  • question_answer
    A system is provided with 200 cal of heat and the work done by the system on the surrounding is 40 J. Then its internal energy                       

    A) Increases by 600 J

    B) Decreases by 800 J

    C) Increases by 800 J

    D) Decreases by 50 J

    Correct Answer: C

    Solution :

    [c] \[\Delta Q=\Delta U+\Delta W\]
                \[\because \]\[\Delta Q=200cal=200\times 4.2=840J\]and \[\Delta W=40J\]
                Þ\[\Delta U=\Delta Q-\Delta W=840-40=800J\]

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