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NEET Sample Paper NEET Sample Test Paper-89

  • question_answer
    A crane is used to lift 1000 kg of coal from a mine 100 m deep. The time taken by the crane is 1 hour. The efficiency of the crane is 80%. If \[g=10\,m{{s}^{-2}},\] then the power of the crane is

    A) \[{{10}^{4}}W\]         

    B)        \[{{10}^{5}}W\]

    C) \[\frac{{{10}^{4}}}{36\times 8}\,W\]   

    D)        \[\frac{{{10}^{5}}}{36\times 8}\,W\]

    Correct Answer: D

    Solution :

    [d] Power supplied \[=\frac{mgh}{t}\] Power used by crane \[=\frac{mgh}{t}\times \frac{100}{80}\] \[=\frac{1000\times 10\times 100}{3600}\times \frac{100}{80}=\frac{{{10}^{5}}}{36\times 8}W\]


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