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NEET Sample Paper NEET Sample Test Paper-60

  • question_answer
    An ideal gas is taken through the cycle\[A\to B\to C\to A,\] as shown in figure. If the net heat supplied to the gas in the cycle is 5J, the work done by the gas in the process \[C\to \text{ }A\]is:

    A) - 5J                             

    B) - 10J     

    C) - 15J                           

    D) - 20J

    Correct Answer: A

    Solution :

    [a] AU = 0        [Cyclic process] \[W={{W}_{AB}}+{{W}_{BC}}+{{W}_{CA}}\] \[\Delta Q=\Delta U+W\]                        \[[\Delta U=0]\] \[\Delta Q=W\] \[5={{W}_{AB}}+{{W}_{BC}}+{{W}_{CA}}\] \[5=10[2-1]+2\times 0+{{W}_{CA}}\] \[5=10+0+{{W}_{CA}}\] \[{{W}_{CA}}=5-10=-5J\]


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