Question

A family consumes 12 kg of LPG in 30 days. Calculate the average energy consumed per day if the calorific value of LPG is 50 kJ/kg.

• A. 10,000 J/day
• B. 15,000 J/day
• C. 20,000 J/day
• D. 25,000 J/day

Answer 1

The correct option is C 20,000 J/day

Energy released by 12 kg of LPG = 12 %$\times$ 50 kJ $=$ 600 kJ
$\therefore$ energy consumed per day
$\frac{600kJ}{30}=20,000$ Joules/day.