Synthetic fibres and Plastics-3

Which of the following is not the characteristic of synthetic plastics?

• lustrous and colourful

• low tensile strength

• non-biodegradeable

• non-conductors

Plastics which have linear arrangement of molecules are

• thermoelectric plastics

• thermoplastics

• thermosetting plastics

• none of these

Plastics which have cross-linked arrangement of molecules are

• thermoelectric plastics

• thermoplastics

• thermosetting plastics

• none of these

Bakelite and melamine are examples of

• thermoplastics

• thermosetting plastics

Which of the following is poor conductor of heat and electricity?

• Bakelite

• Copper

• Graphite

• None of these

Polyvinyl Chloride is an example of

• thermosetting plastics

• thermoplastics

• none of these

Which of the following can not be deformed on heating and thus cannot be remoulded again?

• Polythene

• Polystrene

• Terylene

• Melamine

Plastic buckets are the examples of

• biodegradable materials

• non-biodegradable materials

What may happen due to improper methods of disposal of plastic wastes by burning or throwing them into rivers?

(i) Endanger the lives of aquatic plants and animals.

(ii) causes air pollution.

(iii) damage our immune system.

• (i) and (ii) only

• (iI) and (iiI) only

• (i) and (iii) only

• (i), (ii) and (iii)

Which of the following is NOT a natural polymer?

• Natural rubber

• Polyester

• Protein

• Starch