Synthetic fibres and plastics, class 8

Which of the following polymers is not made by humans in an industrial process?

• Melamine

• Bakelite

• Nylon

• Acrylic

• Silk

Which of the following statements is/are false?

• Cellulose is a polymer that is made up of a large number of small glucose molecules joined one after the other.

• Wood contains a very less amount of cellulose polymer.

• The small molecules that join together to form a polymer are called monomers

Which of the following man-made fibers is made from a natural material called cellulose?

• Polyester

• Rayon

• Nylon

• Acrylic

Which of the following is not a property of nylon?

• Nylon is a thermoplastic polymer.

• Nylon fibers are fairly strong and elastic

• Nylon fibers are lightweight and lustrous.

• It is cheaper than natural silk and can be woven like silk fiber.

Which of the following fiber threads is actually stronger than a steel wire of similar thickness?

• Wool

• Silk

• Nylon

• Cotton

Which of the following is not a characteristic of synthetic fibers?

• Synthetic fibers are very durable.

• Synthetic fibers absorb very little water.

• Synthetic fibers are wrinkle resistant.

• Synthetic fibers are extremely thick and strong.

Polyester is a synthetic fiber in which the polymer units are linked by ester groups. Which of the following is not a property of polyester?

• Polyester fibers are weaker in strength than nylon fibers.

• Polyester fiber is not attacked by moths and ordinary chemicals.

• Polyester is a thermoplastic polymer.

• Polyester fibers are softer than nylon fibers.

Which of the following is a fire-resistant plastic and is used to coat the uniforms of firemen?

• Teflon

• Melamine

• Bakelite

• PVC

Which of the following plastics is used for making electric switches, plugs and sockets?

• Polythene

• Polyvinyl chloride Melamine

• Melamine

• Bakelite

Which of the following arrangements is the correct order of fabrics in their decreasing strength?

• Polyester - Nylon - Silk - Cotton - Wool

• Nylon - Polyester - Silk - Cotton - Wool

• Wool - Nylon - Silk - Cotton - Polyester

• Polyester - Nylon - Cotton - Silk - Wool