chemical engineering polymer technology Mcqs
201. Rayon is superior to cotton in making gauge for wound treatment, because rayon_____________________?
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A. Is a synthetic polymer

B. Does not stick to the wound unlike cotton

C. Can absorb over 90% of its own weight of water

D. Both B. and C.

202. Which of the following is not a polyolefin ?
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A. None of these

B. Polystyrene

C. Polypropylene

D. Neoprene
203. Starting material for the production of SBR is ____________________?
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A. Ethyl alcohol

B. Ethylene

C. Both A. & B.

D. Neither A. nor B.

204. ____________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR?
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A. Strength

B. Freezing point

C. Resilience

D. Percent elongation

205. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the _____________ fibres?
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A. Acrylic

B. Polyvinyl acetate

C. Viscose rayon

D. Saturated polyester
206. Thermoplastic materials___________________?
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A. Do not soften on application of heat

B. Are solvent insoluble

C. Are heavily branched molecules

D. None of these
207. Which of the following is a polymer of Hexamethylene diamine and adipic acid ?
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A. Nylon-6

B. Nylon-6, 10

C. Nylon-66

D. Epoxy resin

208. Which of the following is not an elastomer ?
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A. None of these

B. Polyisoprene

C. Nitrile-butadiene

D. Neoprene

209. Visco-elastic behaviour exhibited by plastics is a ______________ like behaviour?
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A. Liquid

B. Solid

C. Neither solid nor liquid

D. Combination of solid & liquid
210. Polymerisation of poly functional monomers produces polymers having_________________?
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A. None of these

B. Low viscosity

C. Good mechanical strength

D. Low melting point

211. Which of the following is not a natural fiber ?
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A. Wool

B. Silk

C. Cotton

D. Viscose rayon
212. Which of the following polymers does not belong to the class of Polyacrylate polymer ?
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A. Polyacrylonitrile

B. PMMA

C. Poly Ethyl acrylate

D. None of these
213. Polyvinyl chloride (PVC) ____________________?
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A. Can be made thermosetting by adding a plasticiser

B. Softening temperature is 200C

C. Is produced by Polycondensation reaction

D. Uses either emulsion or suspension polymerisation methods
214. Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?
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A. Tricresyl phosphate

B. Ethylene glycol

C. Stearic acid estors

D. Esters of phthalic acid

215. Which of the following polymers shows the highest anti-tacking properties ?
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A. Phenolic resin

B. Melamine formaldehyde resin

C. Epoxy resin

D. Alkyd resin

216. Cross linked polymers are__________________?
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A. Thermosetting

B. Fibres only

C. Thermoplastic

D. Either A. or B.

217. Polyhexamethylene adipamide is also known as______________?
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A. Nylon-66

B. Silicone rubber

C. Bakelite

D. Epoxy resin

218. Benzoyl chloride is not used as a catalyst in the manufacture of___________________?
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A. Polyvinyl acetate

B. Polypropylene

C. Polystyrene

D. Polyvinyl chloride-co-vinyl acetate

219. Diphenylamine is added to rubber to_________________?
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A. Vulcanise it

B. Make it thermosetting

C. Protect it from deterioration on exposure to air

D. Make it non-inflammable

220. The inter particle forces between linear chains in nylon-66 are ______________ bonds?
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A. None of these

B. Hydrogen

C. Ionic

D. Covalent

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
241. Elastomers are__________________?
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A. Having high flexural strength

B. Exemplified by protein derivatives

C. Having very high tensile strength and heat resistance

D. Thermosetting material

242. Pick out the wrong statement?
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A. Nylon fibres have greater water absorption capacity than polyester fibres

B. Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning

C. Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre

D. Crimp is a measure of the difference between the length of the straightened and unstraightened fibre

243. Density of low density polythene is about ____________ gm/c.c?
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A. 0.56

B. 0.38

C. 0.81

D. 0.91
244. The repeating units of PTFE are___________________?
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A. FClC = CF2

B. F3 C-CF3

C. Cl2CH-CH3

D. F2 C = CF2
245. The process involved in converting rubber into a thin sheet or coating it on fabric is called__________________?
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A. Calendaring

B. Extrusion

C. Mastication

D. Vulcanisation

246. Linear polymers are normally_________________?
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A. Having extremely high softening point

B. Thermoplastic

C. Elastometric

D. Thermosetting

247. Polyurethane cannot be used to make____________________?
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A. Fibre reinforced plastic (FRP)

B. Thermal insulation in refrigerator

C. Automobile cushion

D. Coating and adhesive

248. Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is __________________?
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A. Nylon-66

B. Teflon

C. Polyester

D. Bakelite

249. Bakelite (phenol-formaldehyde) resin cannot be used as________________?
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A. Decorative paint

B. Electrical insulation

C. Decorative laminates

D. Glass reinforced plastics

250. Vulcanisation of rubber_____________________?
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A. Increases its ozone & oxygen reactivity

B. Converts its plasticity into elasticity

C. Increases its oil & solvent resistance

D. Decreases its tensile strength