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QUESTION
 

Asked by gpnkumar0 2nd October 2017, 10:57 AM
Answered by Expert
Answer:
The heat supplied to the kettle by the mains is H = VIt
 
Now, this heat is used to boil the water from 20 °C to 100 °C.
 
This heat used up is Q = mcΔT
 
Now, according to principle of calorimetry, H = Q.
 
VIt = mcΔT
t = (mcΔT)/VI = (1 × 4.2 × 103 × (373 - 293))/(220 × 4) = 381.8 s = 381.8/60 = 6.3 min
 
Hence, the correct answer is option C.
Answered by Expert 25th October 2017, 3:43 PM
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