Polymer Technology problems
- 1. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
Options- A. hexamethylene diamine and the ring.
- B. hexamethylene diamine and the adipic acid.
- C. adipic acid and the ring.
- D. none of these. Discuss
Correct Answer: hexamethylene diamine and the adipic acid.
- 2. Pick out the wrong statement regarding the solubility characteristics of high polymers.
Options- 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 molecul ar weight polymers on dissolving gives solution of very low viscosity. Discuss
Correct Answer: High molecul ar weight polymers on dissolving gives solution of very low viscosity.
- 3. Which of the following types of polymers has the strongest inter particle forces?
Options- A. Elastomers
- B. Fibres
- C. Thermoplastics
- D. Thermosetting polymers Discuss
Correct Answer: Thermosetting polymers
- 4. Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.
Options- A. polyurathane
- B. polysulphone
- C. polycarbonate
- D. polyester Discuss
Correct Answer: polycarbonate
- 5. Which of the following is not present in bagasse fibre?
Options- A. Cellulose
- B. Lignin
- C. Pentogens
- D. None of these Discuss
Correct Answer: None of these
- 6. Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces
Options- A. epoxy resin
- B. polyamide
- C. alkyd resin
- D. phenolic resin Discuss
Correct Answer: alkyd resin
- 7. Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.
Options- A. organic peroxides
- B. sulphuric acid
- C. hydroflouric acid
- D. none of these Discuss
Correct Answer: organic peroxides
- 8. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
Options- A. glycerol
- B. nitro cellulose
- C. camphor
- D. none of these Discuss
Correct Answer: camphor
- 9. Dacron is a/an
Options- A. addition polymer
- B. condensation polymer
- C. polyester
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
- 10. Bakelite is a/an
Options- A. addition polymer
- B. elastomer
- C. thermoplastic
- D. none of these Discuss
Correct Answer: none of these
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