Polymer Technology and Engineering Test Questions - Set 05 - ObjectiveBooks

Polymer Technology and Engineering Test Questions - Set 05

Practice Test: Question Set - 05

1. A copolymer is formed by the combination of two or more monomer molecules
    (A) In a chain without the elimination of water
    (B) With the elimination of small amount of water
    (C) Of the same monomer by elimination of small molecules of water
    (D) None of these

2. Pick out the wrong statement regarding the solubility characteristics of high polymers.
    (A) Greater the degree of cross-linking in the polymer, lesser is its solubility
    (B) Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents
    (C) Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent
    (D) High molecular weight polymers on dissolving gives solution of very low viscosity

3. Phosphates (e.g., tricresyl, tributyl, tetrabutyl, triphenyl etc.) are added to polymers to act as
    (A) Hardeners
    (B) Anti-shrinkage agents
    (C) Plasticisers
    (D) Transparency improver

4. Styrene butadiene rubber (SBR) as compared to natural rubber has
    (A) Poor tensile strength
    (B) Poorer resistance
    (C) Greater amount of heat build up heavy loading
    (D) All (a), (b) and (c)

5. The rate controlling step in the manufacture of silicone rubber is the
    (A) Polymer termination step
    (B) Condensation of siloxane to silicone
    (C) Initial hydrolysis of silicone monomer
    (D) None of these

6. The conversion of caprolactam in the above case is about __________ percent.
    (A) 25
    (B) 50
    (C) 70
    (D) 90

7. Viscosity of a polymer solution or melt
    (A) Decreases with increase in molecular weight
    (B) Decreases with increase in temperature
    (C) Increases with increase in temperature
    (D) Does not vary with temperature rise

8. Caprolactam, a raw material for the manufacture of nylon-6, is produced from
    (A) Phenol
    (B) Naphthalene
    (C) Benzene
    (D) Pyridine

9. Vulcanisation of rubber decreases its
    (A) Tensile strength
    (B) Resistance to organic solvents
    (C) Tackiness
    (D) Working temperature range

10. Polyvinyl alcohol is used as a
    (A) Cation/anion exchanger
    (B) Water soluble adhesive
    (C) Textile fibre
    (D) Non-sticky coating on frying pans

11. Which of the following is the most important rubber compounding ingredient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness?
    (A) Phosphorous
    (B) Carbon black
    (C) Pine oil
    (D) Rosin

12. In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer?
    (A) Bakelite (phenol formaldehyde)
    (B) Polyester
    (C) Polythene
    (D) Nylon-6

13. Pick out the wrong statement.
    (A) Cold SBR is superior as compared to hot SBR
    (B) Polymerisation temperature can modify the properties of SBR
    (C) Production of cold SBR employs lower pressure as compared to that of hot SBR
    (D) None of these

14. Molecular weights of plastics ranges from
    (A) 1000 to 5000
    (B) 5000 to 1000
    (C) 20000 to 25000
    (D) 109 to 1011

15. Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are
    (A) 5°C and 1 kgf/cm2
    (B) -20°C and 1 kgf/cm2
    (C) 0°C and 1 kgf/cm2
    (D) 0°C and 3 kgf/cm2

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