MCQOPTIONS
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MCQOPTIONS
This section includes 607 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 501. |
Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2. Which of the following polymers has the maximum film elongation (of the order of 100%) ? |
| A. | Water impermeable cellophane |
| B. | Polythene |
| C. | Cellulose acetate |
| D. | Teflon |
| Answer» C. Cellulose acetate | |
| 502. |
Styrene butadiene rubber (SBR) as compared to natural rubber has |
| A. | poor tensile strength. |
| B. | poorer resistance. |
| C. | greater amount of heat build up heavy loading. |
| D. | all (a), (b) ana (c). |
| Answer» E. | |
| 503. |
Buna-S is also called |
| A. | polyurathane |
| B. | SBR |
| C. | teflon |
| D. | bakelite |
| Answer» C. teflon | |
| 504. |
Non sulphonated hard bakelites are not used for making |
| A. | ion-exchange resins |
| B. | fountain pen barrels |
| C. | formica table tops |
| D. | combs |
| Answer» B. fountain pen barrels | |
| 505. |
Contact lenses for eyes are made of perspex, which is nothing but |
| A. | polymethylmethacrylate |
| B. | polystyrene |
| C. | unsaturated polyester |
| D. | polypropylene |
| Answer» B. polystyrene | |
| 506. |
Trade name of __________ is neoprene. |
| A. | polychloroprene |
| B. | polyisoprene |
| C. | polytetraflouroethylene |
| D. | poly vinyl acetate |
| Answer» B. polyisoprene | |
| 507. |
Diphenylamine is added to rubber to |
| A. | valcanise it. |
| B. | protect it from deterioration on exposure to air. |
| C. | make it non-inflammable. |
| D. | make it thermosetting. |
| Answer» C. make it non-inflammable. | |
| 508. |
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher |
| A. | densities |
| B. | melting point |
| C. | tensile strength |
| D. | hardness, rigidity & brittleness |
| Answer» E. | |
| 509. |
__________ is not a polyester fibre. |
| A. | Terylene |
| B. | Dacron |
| C. | Nylon |
| D. | Polyacrylonitrite |
| Answer» D. Polyacrylonitrite | |
| 510. |
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their |
| A. | molecular sizes. |
| B. | magnitude of intermolecular forces. |
| C. | resistance to heat. |
| D. | polymerisation mechanism. |
| Answer» C. resistance to heat. | |
| 511. |
Thermosetting polymers as compared to thermoplastic polymers |
| A. | are formed by addition polymerisation. |
| B. | have three dimensional structure. |
| C. | have linear structure. |
| D. | none of these. |
| Answer» C. have linear structure. | |
| 512. |
Dacron is a/an |
| A. | polyester |
| B. | unsaturated polyester |
| C. | polyamide |
| D. | inorganic polymer |
| Answer» B. unsaturated polyester | |
| 513. |
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. | |
| 514. |
Thiokol is nothing but |
| A. | polysulphide rubber |
| B. | polyamide fibre |
| C. | engineering plastic |
| D. | exponded polystyrene |
| Answer» B. polyamide fibre | |
| 515. |
In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ? |
| A. | Bakelite (phenol formaldehyde) |
| B. | Polyester |
| C. | Polythene |
| D. | Nylon-6 |
| Answer» B. Polyester | |
| 516. |
Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten |
| A. | saturated polyester |
| B. | polyurathane |
| C. | polystyrene |
| D. | either (b) or (c) |
| Answer» E. | |
| 517. |
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 | |
| 518. |
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. | |
| 519. |
Cellulose is the main contituent of most __________ fibres. |
| A. | acrylic |
| B. | spandex |
| C. | synthetic |
| D. | natural |
| Answer» E. | |
| 520. |
Pickout the wrong statement. |
| A. | Polymers made of only one monomer is called homopolymer. |
| B. | Polymers made of more than one monomer is called copolymer or mixed polymer. |
| C. | Vulcanised rubber is more elastic than natural rubber. |
| D. | The intermoleculer forces in ther-mosplastic polymers are intermediate to that of elastomers & fibres. |
| Answer» B. Polymers made of more than one monomer is called copolymer or mixed polymer. | |
| 521. |
Polystyrene is a light, transparent, thermoplastic material used for making |
| A. | toys and combs |
| B. | packaging bags |
| C. | non-sticking utensils |
| D. | electrical insulation |
| Answer» B. packaging bags | |
| 522. |
Commercial production of polypropylene employs __________ polymerisation. |
| A. | emulsion |
| B. | suspension |
| C. | solution |
| D. | bulk |
| Answer» D. bulk | |
| 523. |
Terylene is a/an |
| A. | addition polymer |
| B. | poly amide |
| C. | homopolymer |
| D. | none of these |
| Answer» E. | |
| 524. |
Which of the following is a copolymer ? |
| A. | PVC |
| B. | Bakelite |
| C. | Polythene |
| D. | Teflon |
| Answer» C. Polythene | |
| 525. |
Polyhexamethylene adipimide is also known as |
| A. | bakelite |
| B. | nylon-66 |
| C. | epoxy resin |
| D. | silicone rubber |
| Answer» C. epoxy resin | |
| 526. |
__________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate. |
| A. | Fibrous |
| B. | Leathery |
| C. | Rubbery |
| D. | Hard |
| Answer» C. Rubbery | |
| 527. |
The inter particle forces between linear chains in nylon-66 are __________ bonds. |
| A. | hydrogen |
| B. | covalant |
| C. | ionic |
| D. | none of these |
| Answer» B. covalant | |
| 528. |
Epoxy resin is |
| A. | not used for surface coating. |
| B. | a good abrasive. |
| C. | an elastomer. |
| D. | a polyester. |
| Answer» C. an elastomer. | |
| 529. |
Ion exchange resins are made of |
| A. | lucite |
| B. | sulphonated bakelite |
| C. | polystyrene |
| D. | teflon |
| Answer» C. polystyrene | |
| 530. |
Cellulose content in bomboo fibre is about __________ percent. |
| A. | 10 |
| B. | 20 |
| C. | 50 |
| D. | 85 |
| Answer» D. 85 | |
| 531. |
SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at |
| A. | 0.04375 |
| B. | 0.12569444444444 |
| C. | 0.043055555555556 |
| D. | 0.084027777777778 |
| Answer» B. 0.12569444444444 | |
| 532. |
Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of |
| A. | cold SBR |
| B. | butyl rubber |
| C. | Bunai N |
| D. | Buna S |
| Answer» C. Bunai N | |
| 533. |
The organic acid monomer in nylon 66 is |
| A. | sebasic acid |
| B. | terephthalic acid |
| C. | adipic acid |
| D. | benzoic acid |
| Answer» D. benzoic acid | |
| 534. |
Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding |
| A. | glycerol |
| B. | nitro cellulose |
| C. | camphor |
| D. | none of these |
| Answer» D. none of these | |
| 535. |
Polymethyl methacrylate (PMMA) is known as |
| A. | bakelite |
| B. | teflon |
| C. | perspex |
| D. | nylon-6 |
| Answer» D. nylon-6 | |
| 536. |
Buna-N is also called |
| A. | butyl rubber |
| B. | nitrile rubber |
| C. | neoprene |
| D. | thiokol |
| Answer» C. neoprene | |
| 537. |
The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is |
| A. | polyvinyl alcohol |
| B. | polyvinyl acetale |
| C. | polyvinyl butyral |
| D. | PVC |
| Answer» D. PVC | |
| 538. |
Which of the following is generally not used as eord for synthetic rubber tyre casing ? |
| A. | Dacron |
| B. | Nylon |
| C. | Cellulose |
| D. | None of these |
| Answer» D. None of these | |
| 539. |
Buna-S is a __________ material. |
| A. | fibrous |
| B. | plastic |
| C. | resinous |
| D. | rubbery |
| Answer» E. | |
| 540. |
__________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine. |
| A. | Epoxy |
| B. | Amino |
| C. | Alkyd |
| D. | Phenolic |
| Answer» C. Alkyd | |
| 541. |
Bakelite (phenol-formaldehyde) resin can not be used as |
| A. | decorative paint. |
| B. | decorative laminates. |
| C. | electrical insulation. |
| D. | glass reinforced plastics. |
| Answer» B. decorative laminates. | |
| 542. |
Ebonite is a/an |
| A. | highly vulcanised rubber. |
| B. | natural rubber. |
| C. | unvulcanised raw rubber. |
| D. | adhesive. |
| Answer» B. natural rubber. | |
| 543. |
Addition polymerisation is not involved in the manufacture of |
| A. | low density polythene. |
| B. | poly vinyl chloride. |
| C. | polystyrene. |
| D. | polyhexamethylene adipamide. |
| Answer» E. | |
| 544. |
Zeigler - Natta catalyst (AlR3 - AlCl3) is used in the polymerisation of |
| A. | vinyl acetate |
| B. | vinyl chloride |
| C. | propylene |
| D. | styrene |
| Answer» D. styrene | |
| 545. |
Which of the following is not an elastomer ? |
| A. | Polyisoprene |
| B. | Neoprene |
| C. | Nitrile-butadiene |
| D. | None of these |
| Answer» E. | |
| 546. |
Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent. |
| A. | 50 |
| B. | 75 |
| C. | 90 |
| D. | 99 |
| Answer» D. 99 | |
| 547. |
Celluloid is |
| A. | cellulose acetate |
| B. | regenerated cellulose |
| C. | cellulose nitrate |
| D. | cellulose acetate butyrate |
| Answer» D. cellulose acetate butyrate | |
| 548. |
In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is |
| A. | terylene |
| B. | polybutadiene |
| C. | PVC |
| D. | polypropylene |
| Answer» B. polybutadiene | |
| 549. |
Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin. |
| A. | resorcinol |
| B. | phenol |
| C. | para-cresol |
| D. | melamine |
| Answer» E. | |
| 550. |
Vulcanisation of raw rubber makes it |
| A. | soft |
| B. | less elastic |
| C. | plastic |
| D. | tacky |
| Answer» C. plastic | |