Polymer Technology problems
- 1. Gutta parcha rubber is
Options- A. soft & tacky at room temperature.
- B. an isomer of natural rubber.
- C. a thermosetting resin.
- D. recovered by coagulation of rubber latex. Discuss
Correct Answer: an isomer of natural rubber.
- 2. Thermosetting resins/polymers as compared to thermoplastic ones are
Options- A. soluble in all organic solvents.
- B. more brittle.
- C. formed by addition polymerisation only.
- D. easily reshaped & reused. Discuss
Correct Answer: more brittle.
- 3. In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of
Options- A. cross linked polystyrene.
- B. phenol formaldehyde resins.
- C. polyesters.
- D. polyamides. Discuss
Correct Answer: cross linked polystyrene.
- 4. Cellulose content in bomboo fibre is about __________ percent.
Options- A. 10
- B. 20
- C. 50
- D. 85 Discuss
Correct Answer: 50
- 5. In condensation polymerisation as compared to addition polymerisation
Options- A. the monomers are unsaturated compounds.
- B. no co-product is lost.
- C. the monomers contain two functional groups.
- D. generally only one monomer is involved Discuss
Correct Answer: the monomers contain two functional groups.
- 6. Poly tetra flouro ethylene (PTFE) is known as
Options- A. dacron
- B. teflon
- C. bakelite
- D. celluloid Discuss
Correct Answer: teflon
- 7. The generic chemical name for the class of polymers which are commerically known as nylons is
Options- A. polyolefins
- B. polyamide
- C. polyacrylate
- D. polyurathane Discuss
Correct Answer: polyamide
- 8. Thermosplastic materials
Options- A. do not soften on application of heat.
- B. are heavily branched molecules.
- C. are solvent insoluble.
- D. none of these. Discuss
Correct Answer: none of these.
- 9. Properties of a polymer is affected by the
Options- A. chain length.
- B. intermolecular forces.
- C. branching & cross-linking.
- D. all (a), (b). Discuss
Correct Answer: all (a), (b).
- 10. Vulcanisation of rubber does not increase its
Options- A. elasticity
- B. plasticity
- C. ductility
- D. none of these Discuss
Correct Answer: plasticity
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