Question

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)

Answer 1

The correct answer is 300.