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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Self Evaluation Test - Work, Energy and Power

  • question_answer
    An electric pump is used to fill an overhead tank of capacity \[9{{m}^{3}}\] kept at a height of 10m above the ground. If the pump takes 5 minutes to fill the tank by consuming 10 kW power the efficiency of the pump should be \[\left( g = 10 m{{s}^{-2}} \right)\]

    A) 60%

    B) 40%

    C) 20%

    D) 30%

    Correct Answer: D

    Solution :

    [d] \[{{P}_{out}}=\frac{mgh}{t}=\frac{9000\times 10\times 10}{5\times 60}=3600W\] \[{{P}_{in}}=10\times {{10}^{3}}\operatorname{w}.\] \[\therefore  \eta =\frac{{{P}_{out}}}{{{P}_{in}}}\times 100=\frac{3000}{10\times {{10}^{3}}}\times 100=30%\]


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