chemical engineering polymer technology MCQs – Page 12

Practise multiple-choice questions from chemical engineering polymer technology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering polymer technology Mcqs

221. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding_________________?
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A. Glycerol

B. Camphor

C. None of these

D. Nitro cellulose

222. _____________ is a thermosetting plastic ?
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A. Bakelite

B. Polystyrene

C. Polythene

D. PVC

223. Vulcanisation of raw rubber makes it__________________?
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A. Soft

B. Tacky

C. Less elastic

D. Plastic

224. Paper like thin plastic articles can be produced by_________________?
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A. None of these

B. Blow moulding

C. Injection moulding

D. Vacuum thermo forming

225. In nylon-6, the number 6 represents the total number of_________________?
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A. Hydrogen atoms in the ring

B. Carbon atoms in the ring

C. Carbon atoms in the linear polymer chain

D. Nitrogen atoms in the ring

226. Thiokol is nothing but____________________?
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A. Polysulphide rubber

B. Polyamide fibre

C. Engineering plastic

D. Expanded polystyrene

227. Phenol formaldehyde __________________?
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A. Employs condensation polymerisation

B. Is a monomer

C. Is an abrasive material

D. Employs addition polymerisation

228. Neoprene is a___________________?
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A. Monomer

B. Polyester

C. None of these

D. Synthetic rubber

229. Pick out the correct statement ?
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A. Plastics are good conductors of heat and electricity

B. The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of

C. ymerisation</strong>

D. All the polymers are highly crystalline in nature

E. Polymers can be vaporised by heating to a very high temperature

230. Vulcanisation of rubber does not increase its_________________?
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A. None of these

B. Ductility

C. Elasticity

D. Plasticity

231. Which of the following is not a natural polymer ?
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A. Nucleic acids e.g. RNA and DNA

B. Polysaccharides

C. Polyurethane

D. Polyisoprene

232. Polymethyl methacrylate (PMMA) which is also known as Perspex and is produced by bulk polymerisation of methyl methacrylate is not a ______________ polymer?
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A. Glass like transparent

B. Thermosetting

C. Thermoplastic

D. Linear

233. Pick out the wrong statement ?
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A. Polymerisation temperature can modify the properties of SBR

B. Cold SBR is superior as compared to hot SBR

C. None of these

D. Production of cold SBR employs lower pressure as compared to that of hot SBR

234. Nitrile rubber is produced by the polymerisation of_________________?
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A. None of these

B. Isobutylene & isoprene

C. Acrylonitrile & styrene

D. Acrylonitrile & butadiene

235. Dacron is a/an ___________________?
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A. Inorganic polymer

B. Unsaturated polyester

C. Polyamide

D. Polyester

236. Lavatory cisterns are normally made of ________________?
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A. Expanded polystyrene

B. Perspex

C. PVC

D. Saturated polyester

237. Softening point of high density polythene is about ______________ C?
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A. 135

B. 85

C. 165

D. 205

238. Scouring is a finishing operation during the manufacture of fibre, which aims at ______________ of fibres?
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A. Improving the stretchability

B. Glycol soaking

C. Detergent solution washing

D. Dyeing/colouring

239. Contact lenses for eyes are made of Perspex, which is nothing but_______________?
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A. Polypropylene

B. Unsaturated polyester

C. poly-methyl-methacrylate

D. Polystyrene

240. Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of __________ C for producing nylon-6?
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A. 100 to 150

B. 50 to 75

C. -20 to 25

D. 250-280

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