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NEET Sample Paper NEET Sample Test Paper-38

  • question_answer
    During an isothermal expansion, a confined ideal gas does -150 J of work against its surroundings. This implies that

    A)  300 J of heat has been added to the gas

    B)  no heat is transferred because the process is isothermal

    C)  150 J of heat has been added to the gas

    D)  150 J of heat has been removed from the gas

    Correct Answer: C

    Solution :

     From the first law of thermodynamics \[\Delta U=Q-W\] For isothermal process, \[\Delta U=0\] \[\therefore \] \[Q=-W\] Given, \[W=-150\,J.\] \[\therefore \] \[Q=+150\,J\] When Q is positive, the heat is added to the gas.


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