1.

Water of volume 2 litre in a container is heated with a coil of \[1\,kW\] at \[27\,{}^\circ C\]. The lid of the container is open and energy dissipates at rate of \[160\,J/s.\] In how much time temperature will rise from \[27\,{}^\circ C\] to \[77\,{}^\circ C\] [Given specific heat of water is \[4.2\,kJ/kg\]]                                 [IIT-JEE (Screening) 2004]

A.            8 min 20 s                              
B.            6 min 2 s
C.            7 min                                       
D.            14 min
Answer» B.            6 min 2 s


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