General Science - Physics (Basics)
Which fuel among the following has the highest energy content per unit mass?
Which fuel among the following has the highest energy content per unit mass?
medium Q15 of 15
Step-by-Step Solution
Step 1: Understand energy content of fuels
Energy content varies; liquid fuels generally have higher energy density than solids or gases.Step 2: Compare typical energy values
Petrol has higher calorific value (~44 MJ/kg) compared to coal (~24 MJ/kg), wood (~16 MJ/kg), and biogas (~21 MJ/m³ but gaseous).Final Answer:
Petrol → Option DQuick Check:
Highest energy per mass = Petrol ✅
Quick Trick: Petrol has higher calorific value than coal or wood.
Common Mistakes:
- Assuming coal has more energy than petrol due to solid state.
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