A. 1.05 x 103s
B. 1.05 x 105s
C. 1.05 x 102s
D. 1.05 x 104s

Correct Answer:

Option A = 1.05 x 103s

Explanation

Power of heater = lvt = 2 x 240 x t
heat required to boil the water = Mct = 2.5 x 4.2 x 103 x (100.52) = 2.5 x 4. 2 x 103 x 48
2 x 240 x t = 2.5 x 4.2 x 103 x 48
∴ t = (2.5 x 4.2 x 103 x 48)/2 x 240
= 1050s or 1.05 x 1033s

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