Paper 1 · People, Development and Environment
UGC NET June 2023 (17.06.2023) Shift-II
Which one of the following energy sources has the lowest energy content per unit mass?
ACoal
BBiomass ✓ Correct
CHydrogen
DNatural gas
Correct answer: (B) Biomass — Biomass has the lowest energy content per unit mass, so the answer is biomass.
Explanation
★Biomass has the lowest energy content per unit mass, so the answer is biomass.
★Energy content per unit mass measures how much energy a fuel stores per kilogram.
★Biomass, made of recently living matter, holds relatively little energy per kilogram.
★It also usually contains moisture, which lowers its usable energy further.
★Coal and natural gas are denser fossil fuels with much higher energy per mass.
★Hydrogen has the highest energy content per unit mass of any fuel.
★So among these, biomass stores the least energy per unit mass.
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