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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2004

  • question_answer
    An electric water kettle rated 2.1 kW is filled with 1.5 kg of water at \[20{}^\circ C\]. How many seconds does it take to reach the boiling point of water? Assume that there are no heat losses from the kettle. Specific heat capacity of water is\[4200\,J\,K{{g}^{-1}}{{K}^{-1}}\]:

    A)  60                                         

    B)  120

    C)  240                       

    D)         480

    E)  720

    Correct Answer: C

    Solution :

    \[P\times t=ms\Delta t\] \[\Rightarrow \]\[2.1\times {{10}^{3}}\times t=1.5\times 4200\]                                 \[\times [(100+273)-(20{}^\circ +273)]\] \[\Rightarrow \]\[t=\frac{1.5\times 4200\times 80}{2.1\times {{10}^{3}}}=240\,s\]


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