Multiple choice

Why do we use tungsten to make the filament of a bulb?

  1. It has the lowest thermal expasion coefficient.

  2. It has high meting point.

  3. Both 1 and 2 are correct.

  4. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It glows because it doesn't melt at low temperature. Both these properties of tungsten metal makes it perfect to be used as filament of a bulb.