Polymer Technology problems
- 1. Thermocole (expanded polystyrene) is not used for
Options- A. low temperature thermal insulation as in refrigerator and air conditioners.
- B. accoustic control and ceiling for building.
- C. high temperature thermal insulation in furnaces.
- D. packing of delicate electronic gadgets. Discuss
Correct Answer: high temperature thermal insulation in furnaces.
- 2. The repeating units of PTFE are
Options- A. Cl2CH-CH3
- B. F2 C = CF2
- C. F3 C-CF3
- D. FClC = CF2 Discuss
Correct Answer: F2 C = CF2
- 3. Orion is
Options- A. a copolymer.
- B. a condensation polymer.
- C. obtained by polymerising vinyl cyanide.
- D. all (a), (b) and (c). Discuss
Correct Answer: obtained by polymerising vinyl cyanide.
- 4. Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an
Options- A. rigid foam
- B. engineering plastic
- C. thermosetting polymer
- D. spongy rubber Discuss
Correct Answer: engineering plastic
- 5. The rate controlling step in the manufacture of silicone rubber is the
Options- A. polymer termination step.
- B. condensation of siloxane to silicone.
- C. initial hydrolysis of silicone monomer.
- D. none of these. Discuss
Correct Answer: initial hydrolysis of silicone monomer.
- 6. Starting material for the production of butadiene in India is
Options- A. naphthalene
- B. benzol
- C. ethyl alcohol
- D. phthalic anhydride Discuss
Correct Answer: ethyl alcohol
- 7. __________ moulding is used for shaping of thermosetting plastics exclusively.
Options- A. Compression
- B. Injection
- C. Transfer
- D. Extrusion Discuss
Correct Answer: Transfer
- 8. Liners of bags are usually made of
Options- A. polythene
- B. PVC
- C. polypropylene
- D. polyesters Discuss
Correct Answer: polypropylene
- 9. Pick out the wrong statement.
Options- A. For the manufacture of styrene, the major raw materials are benzene and ethylene.
- B. One inportant copolymer of styrene is SBR, which is widely used in the manufacture of automobile tyres.
- C. Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis.
- D. Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available. Discuss
Correct Answer: Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available.
- 10. Which of the following is an elastomer?
Options- A. Thiokol
- B. Phenol formaldehyde
- C. Urea formaldehyde
- D. Polystyrene Discuss
Correct Answer: Thiokol
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