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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    A gas is compressed from a volume of \[2{{m}^{3}}\] to a volume of \[1\,{{m}^{3}}\] at a constant pressure of \[100\,N/{{m}^{2}}.\] Then it is heated at constant volume by supplying 150 J of energy. As a result, the internal energy of the gas:

    A) increases by 250 J

    B) decreases by 250 J

    C) increases by 50 J

    D) decreases by 50 J

    Correct Answer: A

    Solution :

    [a] As we know, \[\Delta Q=\Delta U+\Delta W\] (Ist law of thermodynamics) \[\Rightarrow \] \[\Delta Q=\Delta U+P\Delta V\] or  \[150=\Delta U+100(1-2)\]             \[=\Delta U-100\] \[\therefore \] \[\Delta U=150+100=250J\] Thus the internal energy of the gas in- creases by\[250J\]


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