The filament of an electric bulb is made of

Options

A. Iron
B. Tungsten
C. Copper
D. Aluminium

Answer

B

Explanation

The filament of the electric bulb is made up of tungsten: Tungsten is used a lot in the filaments of electric bulbs. Their hardness increases when added to other metals, due to which tungsten is used is alloys of cutting tools, surgical instruments etc., as these alloys are not affected by acids, bases etc. Tungsten is being used in X-ray equipment, thermionic walls, electrical joints etc. Tungsten composite steel has proved useful in many special tasks. Due to this, it is used extensively in the steel industry, Tungsten steel parts are very hard, durable and non-wear resistant The atomic number of tungsten is 74. Its atomic-weight is 184.