2. Solved Papers
  3. WB JEE Medical

WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    An electric water kettle rated 2.1 kW is filled with 1.5 kg of water at \[\text{20}{{\,}^{\text{o}}}\text{C}\text{.}\] 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 \[\text{Jk}{{\text{g}}^{-1}}{{\text{K}}^{-1}}\]

    A)  60                                         

    B)  120

    C)  240                                       

    D)  480

    Correct Answer: C

    Solution :

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


You need to login to perform this action.
You will be redirected in 3 sec spinner