Multiple choice

Which metal is used as filament in a bulb?

  1. Iron

  2. Nickel

  3. Copper

  4. Tungsten
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tungsten is used as the filament in incandescent bulbs because it has an extremely high melting point (3,422°C) and resists vaporization at the high temperatures needed to produce visible light. Other metals like iron, nickel, or copper would melt or evaporate too quickly at these operating temperatures.

Keep practicing — related questions