Question

Why are wires coated with plastic coverings?
A. To make it a bit decorative
B. To make it more durable
C. In order to make them distinguishable
D. To make it shock free

Answer 1

Hint: Identify the type of material used in both wire and coating in accordance to behaviour under electricity conduction i.e. whether it is an insulator or conductor, and look for the suitability as a coating or core of the wire.

Complete answer:
Wires are made up of metals which are good conductors( substances which allow the flow of charge or current through itself ) of electricity.
Plastics on the other hand are very good insulators i.e. material which does not allow flow or passage of any charge or current through itself.
In order to prevent any shock or leakage wires are coated with plastic or rubber coverings, as even an accidental contact with these wires can lead to serious level of injury and burns, sometimes can even lead to cardiac arrest and freezing of blood and nervous system.
Wires are coated with plastic coverings in order to make it shock free or shock proof.

So, the correct answer is “Option D”.

Note:
One of the main reasons why plastic is used as coating is that it is flexible, and can bend around the corners or can be rolled onto a mill. Other materials are also used as coverings such as rubber. In order to distinguish different sets of wires, they can be coated with different colours of coating.