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NEET Physics Thermodynamical Processes NEET PYQ-Thermodynamical Processes

  • question_answer
    During an isothermal expansion, a confined ideal gas does \[-150\text{ }J\] of work against its surroundings. This implies that [AIPMT (S) 2011]

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


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