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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    Find the power of a pump which takes \[10\,\,s\] to draw \[100\,\,kg\] of water from a tank situated at a height of\[20\,\,m\].

    A) \[2\times {{10}^{4}}W\]          

    B)        \[2\times {{10}^{3}}W\]  

    C) \[200\,\,W\]       

    D)        \[1\,\,kW\]

    Correct Answer: B

    Solution :

    \[P=\frac{mgh}{t}=\frac{100\times 10\times 20}{10}\] \[=2\,\,kW\]or\[2\times {{10}^{3}}W\]


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