Here are 1000 Polymer Technology MCQ (Chapterwise).
1. Which of the following polymer type is not classified on the basis of its application and properties?
a) plastics
b) rubbers
c) synthetic
d) fibres
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 polymerization is also known as pearl polymerization?
a) emulsion polymerization
b) suspension polymerization
c) solution polymerization
d) bulk polymerization
View Answer
Explanation: At the end of the suspension polymerization, the polymer formed appears in the form of tiny beads or pearls, so it is also known as pearl polymerization.
3. Which of the following reaction may allow the biphasic interfacial polymerization technique?
a) condensation polymerization
b) addition 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.
4. Which of the following is correct for the resultant polymer product formed, when molecules of phthalic acid react with molecules of glycerol?
a) cross-link polymer
b) linear polymer
c) branch 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.
5. Polymer A, also available as copolymer with trifluoroethylene, is a crystalline polymer with a melting point greater than 160 ᵒC and is used in coatings and insulation materials. What is the name of polymer A?
a) polytetrafluoroethylene
b) polyvinyl chloride
c) polyvinyl fluoride
d) polyvinylidene fluoride
View Answer
Explanation: Polyvinylidene fluoride is a crystalline polymer having melting point of about 176 ᵒC. It is also available as a copolymer with trifluoroethylene which have much higher crystallinity and is used in coatings and insulation on electrical wires and cables.
6. Which of the following polymerization technique allows the increase in both the rate and degree of polymerization simultaneously by increasing a certain parameter?
a) emulsion polymerization
b) suspension polymerization
c) solution polymerization
d) bulk polymerization
View Answer
Explanation: The emulsion polymerization technique allows the increase in both the rate and degree of polymerization simultaneously by increasing the number of polymer particles, N at a fixed rate of initiation.
7. What is the utilization of living polymerization?
a) synthesis of functional-ended polymers
b) monodisperse polymers
c) synthesis of block polymers
d) all of the mentioned
View Answer
Explanation: Living polymerization enables the formation of block polymers by adding a fresh monomer to the reaction. It results in the production of mono-disperse polymers and can also help in generating the functional –ended polymers by reacting the living ends with different reagents.
8. Which of the following is the most widely used polymerization technique to produce polyvinyl actate?
a) emulsion polymerization
b) suspension polymerization
c) solution polymerization
d) all of the mentioned
View Answer
Explanation: Poly vinyl acetate is generally used as emulsion, and therefore emulsion polymerization is widely employed for the production of poly vinyl acetate. Bulk polymerization of vinyl acetate poses difficulties at high conversions due to its high exothermic nature.
9. When should the measurement of the initiator decomposition be done?
a) independent of time
b) during polymerization
c) before polymerization
d) after polymerization
View Answer
Explanation: The measurement of initiator decomposition is done during actual polymerization, as an independent measurement in the absence of monomer would lead to errors.
10. Which of the following polymerization proceeds without the change in the composition of feed as well as copolymer?
a) ideal polymerization
b) azeotropic polymerization
c) alternate polymerization
d) block polymerization
View Answer
Explanation: When the polymerization proceeds without a change in feed and copolymer composition, then there is an occurrence of azeotropic polymerization.
11. Which of the following polymers contains −C−C− linkages only?
a) condensation polymers
b) copolymers
c) addition polymers
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.
12. In which of the following polymer steric placements of the substituent are arranged in such a way to give alternate d and l configurations?
a) syndio-tactic polymer
b) isotactic polymer
c) atactic 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.
13. Which of the following is true about polymer systems in polycondensation?
a) insoluble beyond a critical molecular weight
b) have higher viscosity than small non-polymeric molecules
c) both of the mentioned
d) none of the mentioned
View Answer
Explanation: The medium viscosity in polymer systems is much higher than the systems of small non-polymeric molecules. Besides, there tend to become insoluble after a certain range of chain length or molecular weight.
14. Which of the following is true about an end functional group, having a terminal reactive centre, of a polymer molecule?
a) cannot be determined
b) has greater mobility than the polymer molecule as a whole
c) has a lower mobility than the polymer molecule as a whole
d) same as polymer molecule
View Answer
Explanation: The functional group at a free end has a good degree of mobility to collide and faster reaction to take place.
15. Which of the following polymerization mechanism can polymerize the styrene monomer?
a) radical polymerization
b) anionic polymerization
c) cationic polymerization
d) all of the mentioned
View Answer
Explanation: Styrene is capable of polymerizing by radical as well as cationic and anionic mechanisms. It is placed at a low position in each series of reactivity.
16. What does the ratio of number to weight average degree of polymerization for a bifunctional system represent?
a) extent of reaction
b) degree of polymerization
c) breadth of molecular size
d) none of the mentioned
View Answer
Explanation: The ratio, commonly, is used to represent the molecular size distribution, which is given by (1+p).
17. Which of the following monomer molecule’s presence could lead to the formation of cross linking polymer, when hydroxyl caproic acid and carboxyl acid monomers (f>2) are polymerized together?
a) ethanol
b) diamines
c) glycol
d) none of the mentioned
View Answer
Explanation: Glycol is a bifunctional monomer having hydroxyl groups which will establish cross-links by combining two branches.
18. Which of the following cannot initiate the chain reaction in polymerization of acrylo-nitrile?
a) coordination
b) anion
c) cation
d) free radical
View Answer
Explanation: Acrylonitrile contains ─CN group which is an electron withdrawing group and cannot adopt a cationic pathway. Anion, free radical and coordination complex can polymerize it to high molecular weight polymer.
19. Which of the following reaction is not accompanied by elimination of a byproduct molecule?
a) condensation polymerization
b) addition 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.
20. Which of the following factors does initiator efficiency depend on?
a) polymerization condition
b) solvent
c) initiator molecules
d) all of the mentioned
View Answer
Explanation: The initiator efficiency not only depends on initiator molecules but is also affected by condition of polymerization and the solvent used.
21. What is the effect of polymer transfer on the polymer product formed by radical polymerization?
a) becomes less resistant to foreign agents
b) becomes less crystallizable
c) becomes mechanically weak
d) all of the mentioned
View Answer
Explanation: The polymer transfer leads to the chain branching which makes it less crystalizable, weak in mechanical properties and less resistant to heat, solvents and chemicals.
22. Which of the following is the important commercial use of polyvinyl butyral?
a) decorative laminates
b) film forming technology
c) safety glass interlayer
d) textile and paper treatment
View Answer
Explanation: The commercial importance of polyvinyl butyral is its use as a safety glass interlayer, particularly because of its excellent clarity, toughness and exceptional adhesion o glass.
23. Which of the following types of polymerization is used to produce Polychloroprene commercially?
a) emulsion polymerization
b) solution polymerization
c) bulk polymerization
d) all of the mentioned
View Answer
Explanation: polychloroprene is produced commercially by emulsion polymerization using soap such as rosin soap.
24. Which of the following additives are used in the least amount with polymer in general?
a) cross-linking agents
b) fillers
c) lubricants
d) plasticizers
View Answer
Explanation: Lubricants are used in the least amount among the other additives. Generally, 1-2 parts by weight of lubricants is used per 100 grams of polymer, while 30-100 and 2-5 parts by weight of plasticizers, fillers and cross-linking agents, respectively are used per 100 parts of polymer.
25. How the viscosity of aromatic polyamide solutions does vary with the increase in volume fraction of polymer formed?
a) decreases always
b) first decreases then increases
c) first increases then decreases
d) increases always
View Answer
Explanation: The aromatic polyamide solutions show an initial increase in the viscosity with increase in volume fraction of polymer followed by a reversal in the trend and an abrupt decrease in viscosity when a critical volume fraction of polymer is exceeded.
26. Which of the following kind of polymer has the highest percentage in polypropylene?
a) syndiotactic
b) isotactic
c) atactic
d) all of the mentioned
View Answer
Explanation: The reaction conditions in the polymerization of propylene are varied so as to favour the formation of isotactic polymers. Commercial polypropylene is 90-97% isotactic.
27. How does degree of polymerization affected with increase in temperature of cationic polymerization reaction?
a) cannot be determined
b) increases
c) decreases
d) no change
View Answer
Explanation: Cationic polymerization generally occurs around -100ᵒC temperature. So, the rate and degree of polymerization drops sharply with rise in the temperature.
28. Which of the following compounds is used to control the polymer chain length in emulsion polymerization?
a) gelatin
b) cetyl alcohol
c) buffer solutions
d) dodecyl mercaptan
View Answer
Explanation: Dodecyl mercaptan is used as a chain length regulator or chain transfer agent of high transfer constant to control the chain length of the polymer.
29. Where is the copolymer equation of binary copolymerization not applicable?
a) cationic systems
b) anionic systems
c) free radical systems
d) none of the mentioned
View Answer
Explanation: The copolymer equation is relevant and applicable to radical, cationic and anionic systems, despite variations in values of reactivity ratios depending on the mode of chain propagation.
30. Which of the following cannot affect the average lifetime of a radical in a photo-initiated polymerization?
a) frequency of light radiations
b) intensity of light radiations
c) rate of polymerization, Rp
d) none of the mentioned
View Answer
Explanation: The average lifetime of the radical is proportional to the rate of polymerization, which on the other hand is dependent on the frequency and intensity of incident light. Thus the average lifetime can get affected by all the given factors.
Chapterwise Multiple Choice Questions on Polymer Engineering
- Basic Concepts of High Polymer System
- Condensation Polymerization
- Addition Polymerization
- Copolymerization and Techniques of Polymerization
- Ionic and Stereo – Regular Polymerization
- Plastics: Materials and Processing Technology
- Rubbers: Materials and Processing Technology
- Identification, Testing and Evaluation of Plastics and Rubbers
- Polymer Characteristics and Its Characterization
- Polymer Rheology and Polymer Morphology
- Polymer Blends and Composites
- Conducting Polymers
- Miscellaneous Polymers and Nanotechnology
- Polymer Reaction Engineering
- Unit Operation in Polymer Processing
- Environmental Impact
1. Polymer Engineering MCQ on Basic Concepts of High Polymer System
The section contains polymer engineering multiple choice questions and answers on classification of polymers.
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2. Polymer Technology Multiple Choice Questions on Condensation Polymerization
The section contains polymer technology questions and answers on characteristics and growth of polymerization, distribution of molecular weight and prediction of gel points.
3. Polymer Technology MCQ on Addition Polymerization
The section contains polymer technology MCQs on radical and kinetics chain polymerization, initiation and initiator systems like photo initiation and thermal initiation, chain length and its degree of polymerization, chain transfer and olefin metathesis.
4. Multiple Choice Questions on Copolymerization and Techniques of Polymerization
The section contains polymer engineering multiple choice questions and answers on types and techniques of polymerization and copolymerization, structure and reactivity of monomers and radicals.
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5. Polymer Engineering MCQ on Ionic and Stereo – Regular Polymerization
The section contains polymer engineering questions and answers on linear polymers, cationic and anionic polymerization, stereo regular polymerization and diene monomers.
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6. Polymer Engineering Multiple Choice Questions on Plastics: Materials and Processing Technology
The section contains polymer technology MCQs on polyethylene, polypropylene, polystyrene, polyvinylchloride, polyamides, plastics, amino and phenolic resins.
7. Polymer Technology MCQ on Rubbers: Materials and Processing Technology
The section contains polymer technology multiple choice questions and answers on natural and synthetic rubbers.
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8. Polymer Technology Multiple Choice Questions on Identification, Testing and Evaluation of Plastics and Rubbers
The section contains polymer technology questions and answers on common plastics and rubbers and electrical properties.
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9. Polymer Engineering MCQ on Polymer Characteristics and Its Characterization
The section contains polymer engineering MCQs on vinyl polymers, polymer degradation, molecular weight, membrane osmometry, gel permeation chromatography, strain and ideal elastic solid, techniques of polymer characterization.
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10. Multiple Choice Questions on Polymer Rheology and Polymer Morphology
The section contains polymer engineering multiple choice questions and answers on newtonian and non-newtonian fluids, rheological properties, weissenberg effects, viscoelastic behaviour, mechanical tests, induced crystalization, high polymers and mechanical properties.
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11. Polymer Engineering MCQ on Polymer Blends and Composites
The section contains polymer technology questions and answers on polybends types and properties, polymer composites and glass transition temperature.
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12. Polymer Technology Multiple Choice Questions on Conducting Polymers
The section contains polymer technology MCQs on conducting polymers preparations and carbon fibre conductive polymer composites.
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13. Polymer Engineering MCQ on Miscellaneous Polymers and Nanotechnology
The section contains polymer engineering multiple choice questions and answers on dendritic and inorganic polymers and nanotechnology.
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14. Multiple Choice Questions on Polymer Reaction Engineering
The section contains polymer engineering questions and answers on homogeneous and heterogeneous polymerization and its reactors.
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15. Polymer Engineering MCQ on Unit Operation in Polymer Processing
The section contains polymer technology MCQs on extrusion, injection molding, blow and rotational molding, thermoforming, transfer molding and casting.
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16. Polymer Technology MCQ on Environmental Impact
The section contains polymer technology multiple choice questions and answers on environmental impacts on plastics.
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Wish you the best in your endeavor to learn and master Polymer Engineering!
