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NEET AIPMT SOLVED PAPER 2001

  • question_answer
                      A force of 250 N is required to lift a 75 kg mass through a pulley system. In order to lift the mass through 3 m, the rope has to be pulled through 12 m. The efficiency of system is:                                       

    A)                 50%                       

    B)                 75%                       

    C)                 33%                       

    D)                 90%

    Correct Answer: B

    Solution :

                    Efficiency of the system is                 \[\eta =\frac{output\,work}{input\,work}\]                 Input work = Fs \[=250\times 12\]                 Output work = mgh \[=75\times 10\times 3\]                 So,          \[\eta =\frac{75\times 10\times 3}{250\times 12}=0.75=75%\]


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