Physics - Heat & Thermo Question with Solution | TestHub

A heater of constant power is used to boil water in a pot. During heating, temperature of water increases from 60 °C to 65 °C in 1.0 min. When the heater is switched off, temperature of water falls from 65 °C to 60 °C in 9.0 min. If rate of heat dissipation to the surrounding remains almost constant, what proportion of heat received by water during heating would be dissipated to the surroundings?