Polymer Technology problems
- 1. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
Options- A. Ammonium alum
- B. Potassium alum
- C. both a & b
- D. neither a nor b Discuss
Correct Answer: both a & b
- 2. Transistor parts and refrigerator components are normally made of
Options- A. polystyrene
- B. polyester
- C. high density polythene
- D. polyurathane Discuss
Correct Answer: polystyrene
- 3. 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
Options- A. -5
- B. 10-30
- C. 250-280
- D. 500-600 Discuss
Correct Answer: 250-280
- 4. Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to
Options- A. protect rubber goods from attack by oxygen & ozone present in the atmosphere.
- B. reduce its viscosity to permit easier processing.
- C. reduce the time of vulcanisation and quantity of vulcanising agent.
- D. increase its viscosity. Discuss
Correct Answer: reduce its viscosity to permit easier processing.
- 5. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of
Options- A. cold SBR
- B. butyl rubber
- C. Bunai N
- D. Buna S Discuss
Correct Answer: butyl rubber
- 6. Automobile steering wheels are normally made of
Options- A. cellulose acetate
- B. cellulose nitrate
- C. PVC
- D. high density polythene Discuss
Correct Answer: cellulose acetate
- 7. Orlan fibre which is used as a wool sub stitute is
Options- A. an amorphous polymer.
- B. a natural polymeric fibre.
- C. polyacrylonitrile.
- D. polymethylmethacrylate (PMMA). Discuss
Correct Answer: polyacrylonitrile.
- 8. Visco-elastic behaviour exhibited by plastics is a __________ like behaviour.
Options- A. solid
- B. liquid
- C. combination of solid & liquid
- D. neither solid nor liquid Discuss
Correct Answer: combination of solid & liquid
- 9. Cellulose is the main contituent of most __________ fibres.
Options- A. acrylic
- B. spandex
- C. synthetic
- D. natural Discuss
Correct Answer: natural
- 10. Mastication of rubber means
Options- A. its softening.
- B. a treatment to retard its deterioration due to oxidation.
- C. improving its curing rate.
- D. depression of its freezing point. Discuss
Correct Answer: its softening.
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