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NEET Sample Paper NEET Sample Test Paper-75

  • question_answer
    An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature\[20{}^\circ C\]? \[\left( Boiling point of water = 100{}^\circ C \right)\]

    A)  8.4 min                       

    B)  6.3 min              

    C)  4.2 min                       

    D)  12.6 min

    Correct Answer: B

    Solution :

    \[Power =Vi =220V \times 4A=880\,\,J/s\] Heat required to raise temperature of 1 kg of water through \[80{}^\circ C=\left( ms\Delta T \right)\times 4.2\,\,J\] \[=1000\times 1\times 80\times 4.2=336\times 1{{0}^{3}}J\] \[\therefore \,\,\,\,\operatorname{Time}= \frac{336\times 1{{0}^{3}}}{880} =\,\,382\,\,s =6.3\,\,min\]


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