Engineering Questions with Answers - Multiple Choice Questions
Polymer Engineering MCQ’s – Comparison B/w Addition and Condensation Polymerization
1 - Question
Which of the following reaction is not accompanied by elimination of a byproduct molecule?
a) addition polymerization
b) condensation polymerization
c) both of the mentioned
d) none of the mentioned
View Answer
Explanation: In condensation polymerization, the molecules undergo condensation reaction with a release of a byproduct molecule like water, HCl, etc.
2 - Question
The chain growth process is usually much slower than the step-growth process. State true or false.
a) true
b) false
View Answer
Explanation: The step-growth process is usually slower than addition reaction as it proceeds by an equilibrium step mechanism.
3 - Question
How does the monomer conversion vary at the early stage of step-growth polymerization?
a) faster
b) slower
c) steady
d) none of the mentioned
View Answer
Explanation: The monomer molecules disappear a faster rate in the early stages of step polymerization.
4 - Question
The process in which the molecular weight of polymer almost remains unchanged with the progress of reaction is a ___________
a) addition polymerization
b) condensation polymerization
c) copolymerization
d) none of the mentioned
View Answer
Explanation: The molecular weight of polymer remains more or less unchanged with increasing conversion whereas molecular weight increases throughout the step-growth process.
5 - Question
What does the reaction mixture of addition polymerization contain at any instant of time?
a) full grown polymer molecules
b) unreacted monomer molecules
c) free radical chains and initiators
d) all of the mentioned
View Answer
Explanation: At any instant of time, the reaction mixture consists of polymer molecules, unreacted monomers and a very little concentration of free radical chains and initiators.
6 - Question
Which of the following polymers contains −C−C− linkages only?
a) addition polymers
b) condensation polymers
c) copolymers
d) none of the mentioned
View Answer
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.
7 - Question
Which of the following polymerization can be carried out in melt condition or in solution state?
a) addition polymerization
b) condensation polymerization
c) both of the mentioned
d) none of the mentioned
View Answer
Explanation: Addition and Condensation polymerization, both can be accomplished in bulk under melt condition or in solution.
8 - Question
The process in which molecular weight control is achieved by using a stoichiometric imbalance of the reacting functional group is ___________
a) chain growth process
b) step growth process
c) substitution process
d) none of the mentioned
View Answer
Explanation: Control of molecular weight in condensation polymerization is accomplished by the use of stoichiometric imbalance of the reacting functional group or a calculated amount of monofunctional monomer.
9 - Question
Fully grown polymers are formed at the incidence of termination reaction in addition polymerization reaction. State true or false.
a) true
b) false
View Answer
Explanation: In an addition polymerization reaction, with the incidence of termination reaction, fully grown polymer called dead polymer is formed.
10 - Question
Which reaction may allow the biphasic interfacial polymerization technique?
a) addition polymerization
b) condensation polymerization
c) both of the mentioned
d) none of the mentioned
View Answer
Explanation: Condensation polymerization can be accomplished by employing biphasic interfacial polymerization technique.