Q189. A 300 W heater is used to boil 500g of water at l00 °C. How long should the heater be switched on? (The specific latent heat of vaporization of water is 2230 J/g).Physics — Heat and Thermodynamics — Question 189 of 415A. 62minB. 62 sec C. 1.5 hour D. 0.5 hour Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →