Polymer Technology

231. Thermosetting resins/polymers as compared to thermoplastic ones are

1. Soluble in all organic solvents
2. More brittle
3. Formed by addition polymerisation only
4. Easily reshaped & reused

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232. Thiokol is nothing but

1. Polysulphide rubber
2. Polyamide fibre
3. Engineering plastic
4. Expanded polystyrene

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233. Trade name of _________ is neoprene.

1. Polychlorophrene
2. Polyisoprene
3. Polytetrafluoroethylene
4. Poly vinyl acetate

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234. Transistor parts and refrigerator components are normally made of

1. Polystyrene
2. Polyester
3. High density polythene
4. Polyurethane

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235. Tubeless tyres are made of _________ rubber, which is a co-polymer of isoprene & isobutylene.

1. Nitrile
2. Silicone
3. Neoprene
4. Butyl

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236. Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is

1. 7 kgf/cm² and 70 °C
2. 1000 kgf/cm² and 100°C
3. 7 kgf/cm² and 700°C
4. 1 kgf/cm² (gage) and 70°C

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237. Tyres are made by

1. Injection moulding
2. Extrusion
3. Rotational moulding
4. Compression moulding

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238. Unbreakable crockeries are made from _________ polymers.

1. Polystyrene
2. Melamine
3. Polystyrene
4. Polyurethane

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239. Vinyl flooring is done using _________ sheets.

1. Polypropylene
2. PVC
3. Polythene
4. Polyvinyl acetate

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240. Visco-elastic behaviour exhibited by plastics is a _________ like behaviour.

1. Solid
2. Liquid
3. Combination of solid & liquid
4. Neither solid nor liquid

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