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NEET Sample Paper NEET Sample Test Paper-73

  • 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 :

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


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