JEE Main & Advanced Sample Paper JEE Main - Mock Test - 23

  • question_answer
    In a closed insulated container, a liquid is stirred with a paddle to increase the temperature, which of the following is true?

    A) \[\Delta E=W\ne 0,\,\,q=0\]        

    B) \[\Delta E=W=\,\,q\ne 0\]

    C) \[\Delta E=0,\,W=\,q\ne 0\]        

    D) \[W=0,\,\,\Delta \text{E}\,\text{=}\,\,\text{q}\ne \text{0}\]

    Correct Answer: A

    Solution :

    Internal energy depend upon temperature and according to first law of thermodynamics total energy of an isolated system remains same, i.e., in a system of constant mass, energy can neither be created nor destroyed by any physical or chemical change but can be transformed from one form to another. \[\Delta E=\,\,q+w\] For closed insulated container, \[\operatorname{q}= 0\], so, \[\Delta E = +w\], as work is done by the system.

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