MCQ Solution: Thermodynamics
A kettle with 2 litre waters at 27ºC is heated by operating coil heater of power 1 kW. The heat is lost to the atmosphere at constant rate 160 J/sec when its lid is open. In how much time will water is heated to 77ºC (Sp heat of H2O = 4.2 kJ.mole )
(1)8 min 20 sec (2) 6 min 2 sec (3) 14 min (4) 7 min
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