Verbal Reasoning - Verification of Truth - Discussion

Glass: All traditional bulbs (incandescent, fluorescent, LED) are enclosed in a glass or transparent shell—this is essential for protecting internal components and allowing light to shine through.
Current: A bulb needs current to work, but it doesn’t always have current, like when it's switched off or unplugged.
Filament: Only incandescent bulbs have filaments. LED and fluorescent bulbs don’t.
Light: A bulb is designed to emit light, but it doesn’t always have light (e.g., when turned off or burnt out).
So, glass is the correct answer because it is a constant physical component of all standard bulbs.

I think it should be D because LED does not have a filament.

Thanks all.

I too think it should be option D.

It depends on the material you intend to use for the bulb.

Well, according to me, it would be D.

If we're talking about old bulbs, then glass is important just like filament, If we're talking about LED bulb, then there's no filament in that.

Actually I fill D is correct but led lighting bulbs do not have a filament. That's why light is important for us. Mainly light is required for every people.

Does the florescent tube light have filament?

Common LEDs and LED light bulbs do not have a wire filament or any type of filament, because they produce light through a very different process than incandescent lights do.