Multiple choice

Tungsten is mainly used for making filament of electric bulbs because of its

  1. low cost

  2. high melting point

  3. Low thermal conductivity

  4. high electrical conductivity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tungsten has the highest melting point of all pure metals (3422°C), making it ideal for light bulb filaments that must withstand extreme temperatures without melting. When electric current passes through, the filament glows white-hot to produce light. While tungsten does have high electrical conductivity, that alone wouldn't prevent it from melting.

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