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JEE Main & Advanced Physics Mathematical Tools, Units & Dimensions Question Bank Self Evaluation Test - Physical World, Units and Measurements

  • question_answer
    The values of kinetic energy K and potential energy U are measured as follows: \[K=100.0\pm 2.0\text{ }J,\,\,\,U=200.0\pm 1.0\text{ }J\]. Then the percentage error in the measurement of mechanical energy is -

    A) 2.5%

    B)  1%  

    C)  0.5%

    D)  1.5%

    Correct Answer: B

    Solution :

    [b]\[{{M}_{E}}=K+U=300\pm 3J=E\pm \Delta E\] \[\frac{\Delta E}{E}\times 100=1%\]


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