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Railways PYQCBT 1 2016

RRB NTPC · Question 79

The filament of a light bulb is made up of-

  1. Platinum

  2. Tantalum

  3. Tungsten

  4. Antimony

Show answer & explanation

Answer: (C) Tungsten

Explanation

Incandescent bulb filaments are made of tungsten, because it has the highest melting point of all metals (about 3,422 °C) and can glow white-hot without melting. The bulb is filled with an inert gas so the filament does not oxidise.