JEE Main & Advanced Physics Thermodynamical Processes Question Bank Topic Test - Thermodynamical Process (2021)

  • question_answer
    Unit mass of a liquid with volume \[{{V}_{1}}\] is completely changed into a gas of volume \[{{V}_{2}}\] at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is    

    A) Zero     

    B) \[P({{V}_{2}}-{{V}_{1}})\]

    C) \[L-P({{V}_{2}}-{{V}_{1}})\]

    D) L

    Correct Answer: C

    Solution :

    [c] \[\Delta Q=\Delta V+P\Delta V\]Þ mL = DU + P(V2 – V1)
    Þ DU = L – P (V2 – V1)             (\[\because \] m = 1)

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