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Q .     Two litres of water (density= 1 g/mL) in an open-lid insulated kettle is heated by an electric heater of power 1 kW. The heat is lost from the lid at the rate of 160 .1/s. The time taken for heating water (specific heat capacity 4.2 k.J/ kg) from `20^o`C to `75^o`C is

JEE 2005 Prelims
A

340 s

B

550 s

C

620 s

D

760 s

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