Polymer Technolgy MCQs

Question 1

Which of the following additives are added to plastics to make it impervious to X-rays?

Accepted Answer

Barium salt

Answer

Asbestos

Answer

Carborundum

Answer

Phthalic acid

Question 2

Mastication of rubber means

Accepted Answer

Its softening

Answer

A treatment to retard its deterioration due to oxidation

Answer

Improving its curing rate

Answer

Depression of its freezing point

Question 3

Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.

Accepted Answer

Butyl

Answer

Nitrile

Answer

Silicone

Answer

Neoprene

Question 4

Branched chair polymers as compared to linear polymers have

Accepted Answer

Lower density

Answer

Higher melting point

Answer

Higher tensile strength

Answer

None of these

Question 5

__________ is normally used for the manufacture of refrigerator components and transistor parts.

Accepted Answer

Polystyrene

Answer

Polyproylene

Answer

Polyester

Answer

Polyurathene

Question 6

Pick out the wrong statement.

Accepted Answer

Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

Answer

Linear polymers are formed from bifunctional groups only and are normally thermoplastic

Answer

Cross-linked branched chain polymers are either elastometric or thermosetting

Answer

Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point

Question 7

Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber?

Accepted Answer

Alkylated diphenyl amine

Answer

Carbon

Answer

Thiokol

Answer

Magnesium

Question 8

Nylon-6 as compared to nylon-66 is

Accepted Answer

None of these

Answer

Harder

Answer

More abrasion resistant

Answer

Having higher melting point

Question 9

Buna-S is a __________ material.

Accepted Answer

Rubbery

Answer

Fibrous

Answer

Plastic

Answer

Resinous