Question

plastics are used to make handles of utensils and the covers and casing of electrical appliances give reasons​

Answer 1

Answer:

because plastic is a bad conducter

of heat and electricity

Explanation:

as you can say that heat doesn't effect the handle or the cover quickly that is why it is used

Answer 2

Answer:

Plastic is a poor conductor of heat and electricity. 

This makes it suitable to make the covering of electric wires, handles of electrical appliances, handles of utensils, kitchenware, floor tiles, etc.

hence,

plastics are used to make handles of utensils and the covers and casing of electrical appliances.