Engineering Questions with Answers - Multiple Choice Questions
Polymer Engineering MCQ’s – Classification of Polymers
1 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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.