MCQOPTIONS
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MCQOPTIONS
This section includes 568 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Catalyst used in the production of high density polythene by low pressure Ziegler process is |
| A. | aluminium triethyl activated with TiCl₄ |
| B. | platinum |
| C. | molybdenum |
| D. | Nickel |
| Answer» B. platinum | |
| 202. |
The synthetic fibres produced from __________ are known as rayon. |
| A. | lignin |
| B. | cellulose |
| C. | polyamides |
| D. | ethylene glycol |
| Answer» C. polyamides | |
| 203. |
Plasticisers are added to synthetic plastics to |
| A. | impart flexibility. |
| B. | improve workability during fabrication. |
| C. | develop new improved properties not present in the original resin. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 204. |
Polymerisation of poly functional monomers produces polymers having |
| A. | good machanical strength |
| B. | low viscosity |
| C. | low melting point |
| D. | none of these |
| Answer» B. low viscosity | |
| 205. |
Most of the plastics are safe to be used upto a maximum temperature of __________ °C. |
| A. | 100 |
| B. | 150 |
| C. | 350 |
| D. | 450 |
| Answer» C. 350 | |
| 206. |
__________ nozzles are used in continuous casting of steel. |
| A. | Zircon |
| B. | Thoria |
| C. | Carborundum |
| D. | Beryllia |
| Answer» B. Thoria | |
| 207. |
Nylon-66 is a polyamide of |
| A. | hexamethylene diamine and adipic acid. |
| B. | adipic acid and methyl amine. |
| C. | vinyl chloride and formaldeyde. |
| D. | none of these. |
| Answer» B. adipic acid and methyl amine. | |
| 208. |
__________ polythene is most prone to stress-cracking |
| A. | High density |
| B. | Low density |
| C. | Cross-linked |
| D. | Linear low density |
| Answer» B. Low density | |
| 209. |
Benzoyl chloride is not used as a catalyst in the manufacture of |
| A. | polystyrene |
| B. | polyvinyl acetate |
| C. | polypropylene |
| D. | polyvinyl chloride-co-vinylacetate |
| Answer» D. polyvinyl chloride-co-vinylacetate | |
| 210. |
Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically |
| A. | polymethyl methacrylate (PMMA). |
| B. | Polytetraflouroethylene(PTFE). |
| C. | polycarbonates. |
| D. | phenolic resins. |
| Answer» B. Polytetraflouroethylene(PTFE). | |
| 211. |
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 |
| A. | nylon-66 |
| B. | teflon |
| C. | polyester |
| D. | bakelite |
| Answer» C. polyester | |
| 212. |
Styrene butadiene rubber is commercially manufactured by |
| A. | bulk polymerisation |
| B. | suspension polymerisation |
| C. | solution polymerisation |
| D. | emulsion polymerisation |
| Answer» E. | |
| 213. |
Branched chair polymers as compared to linear polymers have |
| A. | higher melting point. |
| B. | higher tensile strength. |
| C. | lower density. |
| D. | none of these. |
| Answer» D. none of these. | |
| 214. |
__________ is a homopolymer. |
| A. | Neoprene |
| B. | Bakelite |
| C. | Nylon-66 |
| D. | Terylene |
| Answer» B. Bakelite | |
| 215. |
Buna-N is also called |
| A. | butyl rubber |
| B. | nitrile rubber |
| C. | neoprene |
| D. | thiokol |
| Answer» C. neoprene | |
| 216. |
The physical state in which polymers exist is |
| A. | melts & rubber like state. |
| B. | amorphous glassy state. |
| C. | partially crystalline state. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 217. |
The organic acid monomer in nylon 66 is |
| A. | sebasic acid |
| B. | terephthalic acid |
| C. | adipic acid |
| D. | benzoic acid |
| Answer» D. benzoic acid | |
| 218. |
The monomer of natural rubber is |
| A. | DMT |
| B. | isoprene |
| C. | 2 methyl-1-propene |
| D. | both (b) and (c) |
| Answer» E. | |
| 219. |
Zeigler - Natta catalyst (AlR₃ - AlCl₃) is used in the polymerisation of |
| A. | vinyl acetate |
| B. | vinyl chloride |
| C. | propylene |
| D. | styrene |
| Answer» D. styrene | |
| 220. |
Vulcanisation of raw rubber makes it |
| A. | soft |
| B. | less elastic |
| C. | plastic |
| D. | tacky |
| Answer» C. plastic | |
| 221. |
Which of the following additives are added to plastics to make it impervious to X-rays ? |
| A. | Asbestos |
| B. | Barium salt |
| C. | Carborundum |
| D. | Phthalic acid |
| Answer» C. Carborundum | |
| 222. |
Buna-S is also known as |
| A. | teflon |
| B. | PTFE |
| C. | SBR |
| D. | polycrylates |
| Answer» D. polycrylates | |
| 223. |
__________ is a natural fibre. |
| A. | Cellulose |
| B. | Dacron |
| C. | Nylon-6 |
| D. | none of these |
| Answer» B. Dacron | |
| 224. |
Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its |
| A. | tensile strength |
| B. | chemical resistance |
| C. | flexibility |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 225. |
Silicone resins, which are highly water repellant and has good heat resistance can not be used |
| A. | as room temperature adhesive. |
| B. | as grease & lubricant. |
| C. | hydraulic fluid for heat transfer. |
| D. | resin for lamination. |
| Answer» B. as grease & lubricant. | |
| 226. |
90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C. |
| A. | -5 |
| B. | 10-30 |
| C. | 250-280 |
| D. | 500-600 |
| Answer» D. 500-600 | |
| 227. |
Which of the following is a natural polyamide fibre. |
| A. | Wool |
| B. | Silk |
| C. | Cotton |
| D. | None of these |
| Answer» B. Silk | |
| 228. |
Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation ? |
| A. | PVC |
| B. | Bakelite |
| C. | PTFE |
| D. | Epoxy resin |
| Answer» B. Bakelite | |
| 229. |
Glyptal used in the manufacture of paints & lacquers is a __________ polymer. |
| A. | polyamide |
| B. | polystyrene |
| C. | polyester |
| D. | polyacrylonitrile |
| Answer» D. polyacrylonitrile | |
| 230. |
Buna-S is also called |
| A. | polyurathane |
| B. | SBR |
| C. | teflon |
| D. | bakelite |
| Answer» C. teflon | |
| 231. |
Which of the following polymers is used for making a non stick coating on frying pans ? |
| A. | Bakelite |
| B. | Teflon |
| C. | Perspex |
| D. | PVC |
| Answer» C. Perspex | |
| 232. |
Phosphates (e.g., triceresyl, tributyl, tetrabutyl, tripheyl etc.) are added to polymers to act as |
| A. | hardeners |
| B. | anti-shrinkage agents |
| C. | plasticisers |
| D. | transparency improver |
| Answer» D. transparency improver | |
| 233. |
Orlan fibre which is used as a wool sub stitute is |
| A. | an amorphous polymer. |
| B. | a natural polymeric fibre. |
| C. | polyacrylonitrile. |
| D. | polymethylmethacrylate (PMMA). |
| Answer» D. polymethylmethacrylate (PMMA). | |
| 234. |
Phenol formaldehyde is produced by condensation polymerisation. It is also known as |
| A. | teflon |
| B. | bakelite |
| C. | polyester |
| D. | nylon-66 |
| Answer» C. polyester | |
| 235. |
Commercial production of polypropylene employs __________ polymerisation. |
| A. | emulsion |
| B. | suspension |
| C. | solution |
| D. | bulk |
| Answer» D. bulk | |
| 236. |
Polyurathane can not be used for making |
| A. | mattresses & foam |
| B. | coating material |
| C. | adhesives |
| D. | bottles |
| Answer» E. | |
| 237. |
Which of the following is stretched into fibres ? |
| A. | Saturated polyester |
| B. | Unsaturated polyester |
| C. | Isoprene |
| D. | Bakelite |
| Answer» B. Unsaturated polyester | |
| 238. |
Neoprene is rendered non-inflammable, because of |
| A. | its cross-linked structure. |
| B. | its linear chain structure. |
| C. | the presence of chlorine atoms in its monomer. |
| D. | the absence of chlorine atoms in its monomer. |
| Answer» D. the absence of chlorine atoms in its monomer. | |
| 239. |
Polymethyl methacrylate (PMMA) is known as |
| A. | bakelite |
| B. | teflon |
| C. | perspex |
| D. | nylon-6 |
| Answer» D. nylon-6 | |
| 240. |
Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are |
| A. | 5°C and 1 kgf/cm². |
| B. | - 20°C and 1 kgf/cm². |
| C. | 0°C and 1 kgf/cm². |
| D. | 0°C and 3 kgf/cm². |
| Answer» B. - 20°C and 1 kgf/cm². | |
| 241. |
__________ tubes are good substitude for human blood vessels onrheart by-pass operation. |
| A. | PVC |
| B. | Polythene |
| C. | Teflon/dacron |
| D. | Polystyrene |
| Answer» D. Polystyrene | |
| 242. |
Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is |
| A. | Ni |
| B. | V₂O₅ |
| C. | Fe |
| D. | aluminium triethyl combined with titanium tetrachloride |
| Answer» E. | |
| 243. |
Nitrile rubber is produced by the polymerisation of |
| A. | acrylonitrile & butadiene. |
| B. | acrylonitrile & styrene. |
| C. | isobutylene & isoprene. |
| D. | none of these. |
| Answer» B. acrylonitrile & styrene. | |
| 244. |
Condensation polymerisation of __________ produces bakelite. |
| A. | propylene |
| B. | phenol & formaldehyde |
| C. | phenol & acetaldehyde |
| D. | urea & formaldehyde |
| Answer» C. phenol & acetaldehyde | |
| 245. |
Dacron is a/an |
| A. | polyester |
| B. | unsaturated polyester |
| C. | polyamide |
| D. | inorganic polymer |
| Answer» B. unsaturated polyester | |
| 246. |
Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to |
| A. | protect rubber goods from attack by oxygen & ozone present in the atmosphere. |
| B. | reduce its viscosity to permit easier processing. |
| C. | reduce the time of vulcanisation and quantity of vulcanising agent. |
| D. | increase its viscosity. |
| Answer» C. reduce the time of vulcanisation and quantity of vulcanising agent. | |
| 247. |
Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres. |
| A. | acrylic |
| B. | polyester |
| C. | nylon 6:6 |
| D. | polypropylene |
| Answer» B. polyester | |
| 248. |
Thermocole (expanded polystyrene) is not used for |
| 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. |
| Answer» D. packing of delicate electronic gadgets. | |
| 249. |
Plastic articles are normally produced by __________ moulding. |
| A. | green sand |
| B. | injection |
| C. | shell |
| D. | dry sand |
| Answer» C. shell | |
| 250. |
Valcunisation of rubber decreases its |
| A. | tensile strength. |
| B. | resistance to organic solvents. |
| C. | tackiness. |
| D. | working temperature range. |
| Answer» D. working temperature range. | |