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Q.

A 1 KW electric kettle contain 2 liters of water at 27∘C. The kettle is operated for 10 minutes. If heat lost to the surrounding is 160 W, the temperature attained by water in 10 minutes will be

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a

57∘C

b

77∘C

c

67∘C

d

87∘C

answer is C.

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Detailed Solution

P=Et=msΔtt        

840=2×4200×Δt10×60  1000-160W effective power

Δt=60∘C

(t−27)=60

t=87∘C

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