$(a)$ What material is used in making the filament of an electric bulb?
$(b)$ Name the characteristics which make it suitable for this.

(N/A) The filament of an electric bulb is made of $Tungsten$.
$(b)$ The characteristics that make $Tungsten$ suitable for this purpose are:
$1$. It has a very high melting point (approximately $3380^{\circ}C$),which prevents it from melting even when it becomes white-hot during the emission of light.
$2$. It has high resistivity,which allows it to produce a large amount of heat when an electric current passes through it,enabling it to glow brightly.