Science Question Answer (1 Marks)

Polythene, PVC- Poly vinyl chloride, bakelite and melamine are the examples of different plastics.

Nylon is the first fully synthetic fibre. It was prepared from coal, water and air.

Rayon is the man-made fibre which is regarded as artificial silk.

Nylon is used for making parachutes and rock-climbing ropes.

Terylene is a kind of a polyester.

Cellulose polymer is made from the repeat units of the monomer glucose.

PET is a very familiar form of polyester. It is used for making bottles and utensils which is replacing materials like glass.

Teflon is used for nonstick coating on cookware. It is a special plastic on which oil and water do not stick.

Rayon is obtained by the chemical treatment of wood pulp or cellulose.

The plastics which cannot be softened by heating, when moulded once are called thermosetting plastics. Bakelite is a thermosetting plastic.

Polyester is the synthetic fibre which contains the organic group similar-to those which give fruits their sweet smell.

Rayon is the man-made fibre prepared from the natural materials.

Acrylic is the synthetic fibre feels like wool and used as a substitute for wool.