1.

A kettle with 3 liter water at \[27{}^\circ C\] is heated by operating coil heater of power 2 kW. The heat is lost to the atmosphere at constant rate 130 J/sec, when its lid is open. In how much time will water heated to \[97{}^\circ C\] with the lid open? (specific heat of water =4.2kJ/kg)

A. 472 sec
B. 693 sec
C. 912 sec
D. 1101 sec
Answer» B. 693 sec


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