This set of Polymer Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Polymers”.
1. Which of the following polymer type is not classified on the basis of its application and properties?
a) rubbers
b) plastics
c) fibres
d) synthetic
View Answer
Explanation: Synthetic polymers are classified on the basis of their origin and are known as man-made polymers.
2. Which of the following is a thermosetting polymer?
a) polystyrene
b) polyolefins
c) nylons
d) phenolic resins
View Answer
Explanation: Phenolic resins falls under the clan of thermosetting polymers and rest are thermoplastic polymers which can be softened repeatedly on the application of heat.
3. The characteristics of condensation polymerization are given below-
I. only −C−C− linkages present in the polymer structure
II. use of bifunctional or polyfunctional monomers
III. elimination of a small byproduct molecule
Which of the following is true?
a) I, II, III
b) II and III
c) I and II
d) Only III
View Answer
Explanation: Besides −C−C− linkages, polymer structure also contains atoms as O, N, etc., at regular intervals in the main chain.
4. Which of the following monomers are unsuitable for condensation polymerization?
a) propanoic acid and ethanol
b) butane-dioic acid and glycol
c) diamines and dicarboxylic acids
d) hydroxy acids
View Answer
Explanation: Propanoic acid and ethanol, both are monofunctional monomers which are not suitable for a polycondensation reaction to take place.
5. 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
View Answer
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.
6. Which among the following polymers have lowest solubillty?
a) polyethylene
b) polystyrene
c) nylon 6
d) epoxy resin
View Answer
Explanation: Epoxy resin is a cross-linking polymer which has lowest solubility among them.
7. Which of the following polymer exhibit a lower value of molar cohesion?
a) wool
b) silk
c) vulcanized rubber
d) polystyrene
View Answer
Explanation: Rubbers have the lowest value of molar cohesion in comparison to plastics and fibres.
8. 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
View Answer
Explanation: Fibres possess highest tensile strength in comparison to other polymers.
9. Which of the following kind of polymers are known for their high crystallinity?
a) isotactic
b) syndiotactic
c) atactic
d) none of the mentioned
View Answer
Explanation: There is high steric regularity in isotactic polymers which fosters close packing of molecular chains. Thus, they are highly crystalline.
10. Which of the following category does cellulose nitrate fall into?
a) natural
b) synthetic
c) semi-synthetic
d) none of the mentioned
View Answer
Explanation: Cellulose nitrate is a chemically modified form of cellulose. That’s why it falls under the category of semi-synthetic polymers.
11. 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
View Answer
Explanation: Syndio-tactic sequence represents alternate d and l configurations, thus shows a good tendency to crystallize.
Sanfoundry Global Education & Learning Series – Polymer Engineering.
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