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NEET Sample Paper NEET Sample Test Paper-29

  • question_answer
    250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be :-

    A)  \[25%\]                      

    B)  \[33.3%\]

    C)  \[75%\]            

    D)  \[90%\]

    Correct Answer: C

    Solution :

    \[\eta =\frac{useful\,work}{total\,work}=\frac{mgh}{F\times d}=\frac{(75g)\times 3}{250\times 12}=0.75\]           


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