Which gas is commonly used in light bulbs to prevent the filament from burning out?
AArgon
BNitrogen
CHelium
DOxygen
Explanation
Argon is an inert (noble) gas; filling light bulbs with it prevents the tungsten filament from oxidizing or burning up too quickly.
Exam Relevance
- Topic: Physics, Biology, Chemistry & Astronomy
- Subtopic: Human Anatomy, Earth Science, Solar System & Basic Principles

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