Polymer Technolgy MCQs

Question 1

Styrene butadiene rubber (SBR) as compared to natural rubber has

Accepted Answer

All of the above

Answer

Poor tensile strength

Answer

Poorer resistance

Answer

Greater amount of heat build up heavy loading

Question 2

The major component of acrylic fibres is

Accepted Answer

Polyacrylonitrile

Answer

Polyamides

Answer

Polyolefins

Answer

Polyesters

Question 3

Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.

Accepted Answer

Organic peroxides

Answer

Sulphuric acid

Answer

Hydroflouric acid

Answer

None of these

Question 4

Main constituent of cotton fibre is

Accepted Answer

Cellulose

Answer

Lignin

Answer

Starch

Answer

Gelatine

Question 5

Cross linked polymers are

Accepted Answer

Thermosetting

Answer

Thermoplastic

Answer

Either A or B

Answer

Fibres only

Question 6

Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.

Accepted Answer

50

Answer

-20

Answer

250

Answer

500

Question 7

Thermocole (expanded polystyrene) is not used for

Accepted Answer

High temperature thermal insulation in furnaces

Answer

Low temperature thermal insulation as in refrigerator and air conditioners

Answer

Accoustic control and ceiling for building

Answer

Packing of delicate electronic gadgets

Question 8

Low density polythene as compared to high density polythene is

Accepted Answer

More flexible

Answer

Harder

Answer

Tougher

Answer

Chemically inert

Question 9

Dacron is a

Accepted Answer

None of these

Answer

Condensation polymerisation product of hexamethylene diamine and adipic acid

Answer

Condensation polymerisation product of dimethyl terephthalate (DMT) and ethylene glycol

Answer

Thermosetting material