Question

Nitrogen is used for filling the electric bulbs, because it is:

• A. Lighter than air
• B. Capable of giving more light by the bulb
• C. Not helpful in burning
• D. Not poisonous

Answer 1

Answer: (C)

Not helpful in burning

You can't fill a bulb with air or combustion of hot tungsten wire at high temperature will take place in presence of oxygen. You can't maintain vacuum either or external atmospheric pressure will break the glass. So, you have to fill it with non-reactive gas like nitrogen.