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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 25

  • question_answer
    As part of an experiment to determine the latent heat of vaporisation of water, a student boils some water in a beaker using an electric heater as shown below. The student notes two sources of error.
    Error 1: Thermal energy is lost from the sides of the beaker.   
    Error 2: As the water is boiling, water splashes out of the beaker.
    Which of the following gives the correct effect of these two errors on the calculated value for the specific latent heat?

    A)                                Error-1 - Increase                 Error-2 - Decrease

    B) Error-1 - Increase                 Error-2 - Increase

    C) Error-1 - Decrease                Error-2 - Increase

    D) Error-1 - Decrease                Error-2 - Decrease

    Correct Answer: A

    Solution :

    [a] (i) Some energy is lost through sides of beakers (ii) Water splashes, so mass of water become less


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