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Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank Engineering Mechanics

  • question_answer
    What is the work done if a bucket of water weighing 10 N is pulled up from a well 20 m deep by a rope weighing 1 N/m?

    A) 200 N-m                       

    B) 400 N-m

    C) 500 N-m                       

    D) 600 N-m

    Correct Answer: B

    Solution :

    Total work done = Work done to pull the bucket + work done to pull the rope \[=10\times 20+\frac{1}{2}\times 20\times 1\times 20=400\,\,N.\,m\]


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