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9th Class Science Work and energy Question Bank Work Power and Energy Summative Objective Problems

  • question_answer
    The power of a water pump is 2 KW. If\[\text{g}=\text{1}0\text{m}/{{\text{s}}^{\text{2}}}\]the amount of water it can raise in one minute to a height of 10m is

    A)  2000 litre            

    B)  1000 litre

    C)  100 litre                              

    D)  1200 litre

    Correct Answer: D

    Solution :

      \[p=\frac{mgh}{t}\Rightarrow ,\,\,m=\frac{pt}{gh}=\frac{2000\times 60}{10\times 10}\] \[=1200\,kg=1200\,liter\]


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