Synthetic Fibres and Plastics | Chapter Assessment | English | Grade 8

Which of the following is not a man made fibre?

• Jute

• Nylon

• Acrylic

• Polyester

Answer explanation

Nylon, Acrylic and polyester are all man made fibres, whereas Jute is natural fibre that is extracted from plants.

What is the common name of Artificial Silk?

• Jute

• Rayon

• Acrylic

• Polyester

Answer explanation

Artificial Silk is commonly known as Rayon. It is obtained by chemical treatment of wood pulp. Although it is made from wood pulp, which is a natural source, it is regarded as man made fibre.

Which of the following ingredients is not used in making of Nylon?

• Coal

• Water

• Wool

• Air

Answer explanation

Nylon is a purely synthetic fibre, which means non of it's raw materials are obtained from plants or animals. Wool is extracted from animals, therefore, wool is not used in production of Nylon.

Which of the following is the best resistant of heat?

• Bakelite

• Melamine

• Polythene

• PVC

Answer explanation

Polythene and PVC are thermoplastics, which means they can easily melt and can be reshaped when heated slightly. On the other hand, Bakelite and Melamine are thermosetting plastics, which means they are hard to reshape. It takes high temperatures to melt them and reshape them. Amongst bakelite and melamine, melamine is the best resistant of heat.

Which of the following is not a reason for the universal use of plastic?

• They are eco-friendly

• They are lightweight

• they are cheap

• They are easily accessible

Answer explanation

Plastics are used all around the globe, because of their light weight, low price and easy accessibility. But they are not eco-friendly because they are non-biodegradable and this is the reason plastic use has to be restricted.

Which of the following is not made from plastic?

• Cooking utensil handles

• Electrical Switches

• Sports protective equipments

• Rayon

Answer explanation

Cooking utensil handles, Switch boards as well as most of the sports protective equipments are made from different types plastics that give them different strengths and properties. Rayon on the other hand is obtained from chemical treatment of wood pulp.

_____ bags should be carried when going for shopping.

• Cloth

• Plastic

Answer explanation

The most appropriate choice is to use cloth bags. This is because of their durability and hence their multiple use as bags. Cloth bags are biodegradable, whereas plastic bags are not. Plastic bags takes more than 100 years to decompose and even after 100 years, they don't decompose completely. This is extremely harmful for environment.