A heating coil rated 1000W is used to boil off completely 2kg of boiling water. the time required to boil the water is? [Special latent heat of Vaporization of water = 2.3 x 106 Jkg‾¹]

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A. 1.15 x 104s
B. 1.15 x 103s
C. 4.6 x 104s
D. 4.6 x 103s

Correct Answer:

Option D = 4.6 x 103s

Explanation

Heat supplied = Heat gained
pt = ml
T = (ml)/p = (2 x 2.3 x 106)/1000 = 4.6 x 103 sec

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