Explain why, sometimes when we take off the woollen sweater or a polyester shirt in a dark room, we can see tiny sparks of light and hear a crackling sound.

A person is in open space during a thunderstorm with no shelter (not even a tree) available nearby. Describe the safe position which he should take to protect himself from lightning. Why is this position considered safe?

Suggest three measures to protect ourselves from lightning.

Name the material of which a lightning conductor is made.

What is the shape of the top end of a lightning conductor?