MCQ practice · SSC Physics Board questions · Chapter 11: Current Electricity
The price per unit is 10 taka. If the bulb is lit for 5 hours every day, how much will the electricity bill for the month of January be?
Think it through first, then pick an option.
- a 93 taka
- b 92 taka
- c 91 taka
- d 90 taka
Answer and explanation
Correct answer: a 93 taka
January has 31 days: energy = 60 × (5 × 31) ÷ 1000 = 9.3 units; the bill = 9.3 × 10 = 93 taka.
Why the other options are wrong
- b 92 taka: 92 taka does not fit; 9.3 units × 10 taka = 93 taka.
- c 91 taka: 91 taka does not fit; 9.3 units × 10 taka = 93 taka.
- d 90 taka: 90 taka comes from 30 days (9 units); January has 31 days, so 93 taka.
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