CNG is mostly used as a fuel in:
a) Aeroplanes
b) Automobiles
c) Ships
d) Trains

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Detailed Solution

The correct answer is (b) Automobiles

CNG (Compressed Natural Gas) is mainly methane compressed to high pressure (about 200–250 bar) and used as a clean fuel in cars, buses, auto-rickshaws and light commercial vehicles. It burns more cleanly than petrol or diesel, producing less smoke, CO₂, CO, NOₓ and particulate matter, so it helps reduce air pollution in cities. CNG engines also make less carbon deposits and the fuel is often cost-effective for daily transport.

Why not the others?

Aeroplanes: use aviation turbine fuel (ATF/jet fuel), a kerosene fraction—not CNG.
Ships: generally use marine diesel or heavy fuel oil; some modern vessels try LNG, but CNG is uncommon.
Trains: mostly electric or diesel; a few trials used CNG, but it is not the common fuel.

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