Metals are good conductors of electricity because they contain:

Aluminium is a ........

By increasing the temperature, the conductivity of the semiconductor is:

Carbon exists as allotropes, which are different crystalline or molecular forms of the same substance. Graphite and diamond are allotropes of carbon. Diamond is a non-conductor whereas graphite is a good conductor because:

Conductivity of a semiconductor material increases byI. increasing temperature.II. increasing the surface area.III. decreasing the density of charge carriers.IV. doping with small amounts of impurities.

Dark plastic handlers often used on kitchen utensils because: