Home PYQs UPPSC UPPSC MCQs Prelims 2017 (GS Paper I)

Question

Five bulbs each of 100-watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be:

  1. One unit
  2. Ten units
  3. Two units
  4. Twenty units

Answer:

Option B: Ten units

Detailed Solution:

The correct answer is “Ten units”.

Electricity consumption (in units) = (Power in watts) × (Time in hours) / 1000

Electricity consumption = (5 bulbs × 100 watts/bulb) × (20 hours) / 1000
= 500 watts × 20 hours / 1000
= 10 units