Question

Read the given statements about synthetic fibres and
plastics carefully.

I. Polycot is a mixture of two types of fibres, polyester and cotton.

II. Melamine is a thermosetting plastic used for making kitchenware.

III. Uniforms of firemen have coating of nylon to make them flame resistant.

IV. Polythene and PVC are the examples of thermosetting plastics.

Which of these statements are corect?

• A. II and III
• B. I and II
• C. II and IV
• D. II, II, and IV

Answer 1

The correct option is B I and II

$\bullet$ Polycot is obtained by mixing polyester and cotton.
$\bullet$ Melamine is a thermosetting plastic. i.e , once cooled and hardened , these plastics retain their shapes and cannot return to their original form. Melamine is hard and durable in nature.It is a versatile material. It resists fire and can tolerate heat better than other plastics therefore it is used to make firemen uniforms and kitchenware. However, nylon cloths easily catch fire and blaze up with only a little spark.
$\bullet$ Thermoplastics become moldable above a specific temperature and then return back to a solid when cooled. Polyethene and PVC are most commonly known examples of thermoplastics.