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NEET Sample Paper NEET Sample Test Paper-66

  • question_answer
    Latent heat of ice is 80 cal/g. A man melts 60 g of ice by chewing in 1 min. His power is

    A) 4800 W            

    B) 336 W

    C) 1.33 W             

    D) 0.75 W

    Correct Answer: B

    Solution :

    \[W=JQ=J\left( mL \right)\] \[\Rightarrow \,\,P\,\,\times \,\,t=J(mL)\Rightarrow \,\,P\,\,=\,\,J\left( \frac{m}{t} \right)\,L;\] where \[\frac{m}{t\,\,}\,\,=\,\,\] rate of melting of ice by chewing \[=\,\,\frac{60\,g}{\min }\,\,=\,\,\frac{1\,g}{\sec }\,\,\Rightarrow \,\,P=4.2\times 1\times 80\,\,=\,\,336\,W\]


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