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  4. A water heater of power 2000 W is used to heat water. The specific heat capacity of water is 4200 J kg -1 K -1. The efficiency of heater is 70 %. Time required to heat 2 kg of water from 10° C to 60° C is s. (Assume that the specific heat capacity of water remains constant over the temperature range of the water).

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Q. A water heater of power $2000 W$ is used to heat water. The specific heat capacity of water is $4200 \,J$ $kg ^{-1}\, K ^{-1}$. The efficiency of heater is $70 \%$. Time required to heat $2 \,kg$ of water from $10^{\circ} C$ to $60^{\circ} C$ is___$ s$.
(Assume that the specific heat capacity of water remains constant over the temperature range of the water).

JEE MainJEE Main 2023Thermal Properties of Matter

Solution:

Correct answer is '300'