Polymer Technology problems
- 1. Polystyrene is a light, transparent, thermoplastic material used for making
Options- A. toys and combs
- B. packaging bags
- C. non-sticking utensils
- D. electrical insulation Discuss
Correct Answer: toys and combs
- 2. A copolymer is formed by the combination of two or more monomer molecules
Options- 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. Discuss
Correct Answer: in a chain without the elimination of water.
- 3. Bristles of tooth brushes are made of
Options- A. nylon-6
- B. nylon-66
- C. polystyrene
- D. PVC Discuss
Correct Answer: nylon-66
- 4. Polystyrene is a __________ plastic at room temperature.
Options- A. ductile
- B. brittle
- C. malleable
- D. none of these Discuss
Correct Answer: brittle
- 5. Alkyd resin can not be used for making
Options- A. plasticiser
- B. paint & varnish
- C. fibres
- D. film forming materials Discuss
Correct Answer: fibres
- 6. Valcunisation of rubber decreases its
Options- A. tensile strength.
- B. resistance to organic solvents.
- C. tackiness.
- D. working temperature range. Discuss
Correct Answer: tackiness.
- 7. Plastic articles are normally produced by __________ moulding.
Options- A. green sand
- B. injection
- C. shell
- D. dry sand Discuss
Correct Answer: injection
- 8. Amino resins are used in paper treatment to improve its
Options- A. wet tear and bursting strength.
- B. folding endurance
- C. wet rub resistance
- D. all (a), (b) & (c) Discuss
Correct Answer: all (a), (b) & (c)
- 9. Vulcanisation of raw rubber makes it
Options- A. soft
- B. less elastic
- C. plastic
- D. tacky Discuss
Correct Answer: less elastic
- 10. Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not used
Options- A. for surface coating of automobiles & air crafts.
- B. for fibre making.
- C. as plasticiser for PVC & nitrocellulose.
- D. for film forming materials. Discuss
Correct Answer: for fibre making.
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