A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?
A
1k
B
2k
C
5k
D
10k
E
20k
Verified Correct Answer: B.
Physical Principles & Numerical Solution
100W X 10h = 1000Wh = 1KWh thus cost is 2k
Source: Myschool Past Questions Archive (Record #26265)