Which one of the following metals is most commonly used for making fil

Which one of the following metals is most commonly used for making filament of incandescent electric bulbs?

[amp_mcq option1=”Aluminium” option2=”Silver” option3=”Copper” option4=”Tungsten” correct=”option4″]

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UPSC NDA-2 – 2022

Tungsten is the metal most commonly used for making the filament of incandescent electric bulbs.

– The filament in an incandescent bulb needs to glow white-hot (reach a very high temperature) to produce light.
– This requires a material with a very high melting point that can withstand such extreme temperatures without melting or vaporizing quickly.
– Tungsten (chemical symbol W) has the highest melting point of all known metals (3422°C or 6192°F).
– It also has high tensile strength, even at high temperatures, and relatively low vapor pressure, reducing evaporation of the filament.

Early incandescent bulbs used carbon filaments, but tungsten proved to be significantly more efficient and durable. The bulb is often filled with inert gases like argon or nitrogen to reduce tungsten evaporation and prolong the filament’s life.

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