Synthetic fibres and plastics(grade8)

Raw materials for preparation of synthetic fibres are obtained from

• coal

• petroleum

• natural gas

• all of these

Which fibre is used as artificial wool?

• Nylon

• Rayon

• Acrylic

• Polyster

Which of the following fibre has highest tensile strength?

• cotton

• silk

• nylon

• rayon

Which of the following polyester is made by blending polyester and cotton?

• Terrywool

• Terrycot

• Terrysilk

• PET

The property of materials by which they can be moulded into any shape is called

• elasticity

• plasticity

• durability

• conductivity

Which of the following are made from thermosetting plastic?

• Bottles

• Crockery

• Shoes

• Handbags

Plastics that retain their plasticity on repeated heating are called

• thermoplastics

• thermosetting plastics

• thermal plastics

• none of these

Which of the following is a characteristic of plastics?

• Electrical conductors

• Heat conductors

• Biodegradable

• Non-biodegradable

Plastic bags are generally made from which plastic?

• PET

• Polythene

• Bakelite

• Melamine

The purest natural form of cellulose is

• rayon

• silk

• wool

• cotton