JEE PHYSICS MCQ: CURRENT ELECTRICITY

1 Medium

1 of 1

Application +4 | -1

An electric water kettle rated

\mathrm{2}\mathrm{.1 }\,\mathrm{kW}

is filled with

\mathrm{1}\mathrm{.5 }\,\,\mathrm{kg}

of water at

20\,{\,^0}\mathrm{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\,\,\mathrm{Jk}{\mathrm{g}^{ - 1}}\,{\mathrm{K}^{ - 1}}

View answer and explanation

Correct option: C

\begin{array}{llllllllllllllllllll} {\mathrm{240}} \end{array}

Option C (

\begin{array}{llllllllllllllllllll} {\mathrm{240}} \end{array}

) is correct because it is the time calculated using the power, mass, specific heat capacity, and temperature change.

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