Polymerization, Polymer Blends and Polymeric Composites MCQs

1. Cross-linked polymers are swollen with a different monomer, which results in which one?

(A) Mechanical blends

(B) Chemical blends

(C) Latex blends

(D) Solution-cast blends

2. Polymers are dissolved in a common solvent for giving which one?

(A) Chemical blends

(B) Mechanical blends

(C) Latex blends

(D) Solution-cast blends

3. Mixing leads to the formation of which one, for amorphous and semi-crystalline polymers?

(A) Chemical blends

(B) Solution-cast blends

(C) Latex blends

(D) Mechanical blends

4. Which of the following is the physical mixture of two or more polymers that are not linked by covalent bonds?

(A) Polymerisation

(B) Dendrimer

(C) Polyblend

(D) Multi blend

5. Which of the following is the immiscible blends exhibit?

(A) Poor mechanical properties

(B) Poor chemical properties

(C) Excellent mechanical properties

(D) Intermediate chemical properties

6. _________ is incorrect.

(A) Characteristics of every component, immiscible blends exhibit separate Tg’s

(B) Immiscible blend is usually opaque

(C) Miscible blend is usually clear

(D) Between those of individual components, immiscible blends exhibit a single glass transition temperature (Tg) intermediate

7. Which of the following is the blend said to be synergistic for the mechanical property if the term (I) in the empirical formula?

(A) Zero

(B) Negative

(C) Imaginary

(D) Positive

8. Which of the following is the blend said to be additive for the mechanical property if the term (I) is in the empirical formula?

(A) Imaginary

(B) Positive

(C) Negative

(D) Zero

9. In the water are mixed and coagulated to give which one fine dispersions of polymers?

(A) Latex blends

(B) Solution-cast blends

(C) Chemical blends

(D) Mechanical blends

10. Which of the following are the small molecules which combine to form a polymer?

(A) Resins

(B) Blocks

(C) Plastic

(D) Monomers

11. _______ is incorrect?

(A) In the polymer, the degree of polymerization is the number of monomeric units contained

(B) Polymers are called resins when in a form ready for further working

(C) Polymers are also called macro-molecules due to their small size

(D) Polymerization, the chemical process leading to the formation of polymer, is known

12. Which of the following is the polymer is any substance made up of many repeating units?

(A) Plastic

(B) Resins

(C) Mere

(D) Blocks

13. ________ is not an example of semi-crystalline polymer.

(A) HDPE

(B) Nylon

(C) Polyesters

(D) LDPE

14. Which of the following is the functionality of ethylene glycol?

(A) 4

(B) 3

(C) 2

(D) 5

15. ________ polymer is not classified under the category of configuration.

(A) Cross-linked

(B) Atactic

(C) Syndiotactic

(D) Isotactic

16. Which of the following is the optimum DP value of cellulose?

(A) 150

(B) 250

(C) 500

(D) 400

17. Styrene acrylonitrile is an example of which one?

(A) Linear polymer

(B) Co-polymer

(C) Amorphous polymer

(D) Homopolymer

18. ________ polymer is not classified under the category of end use.

(A) Fibers

(B) Synthetic

(C) Elastomers

(D) Adhesives

19. _______ is incorrect.

(A) In any solvent, thermosets are generally insoluble

(B) By condensation polymerisation reactions thermosets are formed

(C) Cross-linked network structure thermosets have 3-D

(D) Thermosets stiffen on cooling and soften on heating

20. _______ is not an example of thermoplastic?

(A) Polyvinyl chloride

(B) Nylon

(C) Epoxy

(D) Polyesters

21. Which of the following is the weight average molecular weight for PP given its degree of polymerization as 10,000?

(A) 3,00,000 gm/mol

(B) 6,70,000 gm/mol

(C) 4,20,000 gm/mol

(D) 8,40,000 gm/mol

22. The cryoscopy refers to which one?

(A) Osmotic pressure measurement

(B) Elevation in boiling point measurement

(C) Increase in solubility measurement

(D) Freezing point depression measurement

23. __________ is not a property of matrix materials which are modified by adding particulate fillers.

(A) Modification in electrical conductivity

(B) Decrease in surface hardness

(C) Improved performance at elevated temperature

(D) Improved abrasion resistance

24. _______ is not combined with fiber to give composites.

(A) Polymers

(B) Metals

(C) Ceramics

(D) Non-metals

25. ____________ is the aspect ratio.

(A) Diameter to length ratio

(B) Length to diameter ratio

(C) Length to depth ratio

(D) Depth to length ratio

26. _____ is incorrect.

(A) None of these

(B) By a layer of less dense core material, sandwich panels consist of two stronger outer sheets separated

(C) Core material should be low corrosion and heavy-weight resistance

(D) 2-D sheets that are stacked and subsequently cemented together laminar composites consist of

27. To which of core thickness, the flexural stiffness of the sandwich panel is proportional?

(A) Square

(B) Cube

(C) Inverse

(D) Square root

28. ______ is not an application of a sandwich panel.

(A) Fabrication of wings of aircrafts

(B) Conveyor belts

(C) Design of ships, boat hulls

(D) Fabrication of roofs, floors and walls of buildings

29. Which of the following is one of the most popular types of core material used?

(A) Metal foam

(B) Glass

(C) Honeycomb

(D) Plastic

30. ______ is not a characteristic of glass-fiber reinforced composites.

(A) Low density

(B) Excellent chemical and corrosion resistance

(C) High tensile strength

(D) Low impact resistance

31. Which of the following are the resultant composites when fibers are used as a dispersed phase for the reinforcement of matrices?

(A) Carbon-fiber reinforced

(B) Glass-fiber reinforced

(C) Wood-fiber reinforced

(D) Unidirectional-fiber reinforced

32. ______ is an application of glass-fiber reinforced composites.

(A) Chemical pipelines

(B) Bicycle frames

(C) Aircraft parts

(D) Boat hulls