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Polymer Technology Mcqs

Q:

What is the range of tensile strength, exhibited by fibres?

A) 300-3,000 B) 4,000-15,000
C) 20,000-150,000 D) 5,000-10,000
 
Answer & Explanation Answer: C) 20,000-150,000

Explanation: Fibres possess highest tensile strength in comparison to other polymers.

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421
Q:

The polymer in which steric placements of the substituent are arranged in such a way to give alternate d and l configurations, is known as _________________

A) isotactic polymer B) atactic polymer
C) syndio-tactic polymer D) none of the mentioned
 
Answer & Explanation Answer: C) syndio-tactic polymer

Explanation: Syndio-tactic sequence represents alternate d and l configurations, thus shows a good tendency to crystallize.

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359
Q:

Which of the following polymer exhibit a lower value of molar cohesion?

A) wool B) silk
C) vulcanized rubber D) polystyrene
 
Answer & Explanation Answer: C) vulcanized rubber

Explanation: Rubbers have the lowest value of molar cohesion in comparison to plastics and fibres.

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334
Q:

Which of the following monomer pairs forms a copolymer that exhibits excellent chemical resistance and self-extinguishing properties?

A) vinyl chloride + vinylidene chloride B) vinyl chloride + vinyl acetate
C) vinyl chloride + acrylonitrile D) none of the mentioned
 
Answer & Explanation Answer: A) vinyl chloride + vinylidene chloride

Explanation: Copolymer of 15% vinyl chloride and 85% vinylidene chloride, known as Saran in the trade, has excellent chemical inertness including resistance to acids and alkalies and prominent self-extinguishing properties.

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271
Q:

Which of the following is true for the resultant polymer product formed, when molecules of pthalic acid react with molecules of glycerol?

A) branch polymer B) cross-link polymer
C) linear polymer D) none of the mentioned
 
Answer & Explanation Answer: B) cross-link polymer

Explanation: The reaction between pthalic acid and glycerol initially results into linear or branched polymer but, due to trifunctionality of glycerol, ultimately cross-linking takes place between the molecules.

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204
Q:

Which of the following grades of poly vinyl chloride is unsuitable for insulation purposes?

A) bulk grade B) suspension grade
C) emulsion grade D) none of the mentioned
 
Answer & Explanation Answer: C) emulsion grade

Explanation: The emulsion grade of PVC contains some traces of soap or detergent and other ionic components, which makes it unsuitable to be used in insulation industry.

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186
Q:

Which of the following polymers contains ?C?C? linkages only?

A) addition polymers B) condensation polymers
C) copolymers D) none of the mentioned
 
Answer & Explanation Answer: A) addition polymers

Explanation: Chain growth polymers contain only ?C?C? linkages whereas step growth polymers contain atoms like O, N, S in between the ?C?C? linkages.

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165
Q:

Which of the following can be used as an initiator for the formation of low density polyethylene (LDPE)?

A) benzoyl peroxide B) sulphuric acid
C) dithionite ion D) nitrobenzene
 
Answer & Explanation Answer: A) benzoyl peroxide

Explanation: The initiators than can be used for formation of LDPE are peroxides , oxygen or azo-compounds.

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