Multiple choice

Filament inside an electric bulb is made up of

  1. Iron

  2. Platinum

  3. Tungsten

  4. Cadmium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tungsten is used in electric bulb filaments because it has an extremely high melting point (3422°C) and resists sublimation at high temperatures. Iron would melt and oxidize too quickly. Platinum is expensive and not ideal. Cadmium is too soft and has a low melting point.

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