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.
| 401. |
Poly Vinyl chloride (PVC) is a __________ material. |
| A. | thermoplastic |
| B. | thermosetting |
| C. | fibrous |
| D. | chemically active |
| Answer» B. thermosetting | |
| 402. |
In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of |
| A. | cross linked polystyrene. |
| B. | phenol formaldehyde resins. |
| C. | polyesters. |
| D. | polyamides. |
| Answer» B. phenol formaldehyde resins. | |
| 403. |
Nylon-6 as compared to nylon-66 is |
| A. | harder. |
| B. | more abrasion resistant. |
| C. | having higher melting point. |
| D. | none of these. |
| Answer» E. | |
| 404. |
In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ? |
| A. | PTFE |
| B. | Buna-S |
| C. | PMMA |
| D. | Polycaprolactum |
| Answer» C. PMMA | |
| 405. |
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. | |
| 406. |
Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the |
| A. | electrical insulation purpose. |
| B. | tanning of leather. |
| C. | strengthening of plaster of paris. |
| D. | decorative laminates. |
| Answer» D. decorative laminates. | |
| 407. |
Main constituent of cotton fibre is |
| A. | lignin |
| B. | cellulose |
| C. | starch |
| D. | gelatine |
| Answer» C. starch | |
| 408. |
Polymerisation product of C2F4 (carbon tetraflouride) is called P.T.F.E. (poly chloro tetra flouro ethylene). It is also called |
| A. | polyurethane |
| B. | silicone rubber |
| C. | teflon |
| D. | epoxy resin |
| Answer» D. epoxy resin | |
| 409. |
Polymethyl methacrylate, which is an acrylic resin, is also called |
| A. | thiokol |
| B. | plexiglass or lucite |
| C. | dacron |
| D. | teflon |
| Answer» C. dacron | |
| 410. |
Styrene butadiene rubber (SBR) is never used for making |
| A. | coated fabrics |
| B. | front wheel tyres of aeroplanes (i.e., heavy duty tyres) |
| C. | gaskets |
| D. | soles of shoes |
| Answer» C. gaskets | |
| 411. |
Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?$ |
| A. | Butyl rubber |
| B. | Silicon rubber |
| C. | Nitrile rubber |
| D. | Silicone rubber |
| Answer» E. | |
| 412. |
Thermoplastic resins usually |
| A. | remain hard as long as they are hot. |
| B. | can not be reclaimed from waste. |
| C. | permanent setting resins. |
| D. | less brittle than thermosetting resins. |
| Answer» E. | |
| 413. |
Orion is |
| A. | a copolymer. |
| B. | a condensation polymer. |
| C. | obtained by polymerising vinyl cyanide. |
| D. | all (a), (b) and (c). |
| Answer» D. all (a), (b) and (c). | |
| 414. |
Polyvinyl chloride (PVC) |
| A. | is produced by polycondensation reaction. |
| B. | uses either emulsion or suspension polymerisation methods. |
| C. | can be made thermosetting by adding a plasticiser. |
| D. | softening temperature is 200°C. |
| Answer» C. can be made thermosetting by adding a plasticiser. | |
| 415. |
__________ is a natural fibre. |
| A. | Cellulose |
| B. | Dacron |
| C. | Nylon-6 |
| D. | none of these |
| Answer» B. Dacron | |
| 416. |
Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ? |
| A. | 50000 |
| B. | 51600 |
| C. | 49200 |
| D. | 50800 |
| Answer» B. 51600 | |
| 417. |
Which of the following is not a polyolefin ? |
| A. | Polystyrene |
| B. | Polypropylene |
| C. | Neoprene |
| D. | None of these |
| Answer» D. None of these | |
| 418. |
In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the |
| A. | hexamethylene diamine and the ring. |
| B. | hexamethylene diamine and the adipic acid. |
| C. | adipic acid and the ring. |
| D. | none of these. |
| Answer» C. adipic acid and the ring. | |
| 419. |
Teflon is |
| A. | phenol formaldehyde |
| B. | an inorganic polymer |
| C. | polytetra florouethylene (PTFE) |
| D. | a monomer |
| Answer» D. a monomer | |
| 420. |
__________ polythene is most prone to stress-cracking |
| A. | High density |
| B. | Low density |
| C. | Cross-linked |
| D. | Linear low density |
| Answer» B. Low density | |
| 421. |
Polyurathane can not be used to make |
| A. | automobile cushion |
| B. | thermal insulation in refrigerator |
| C. | coating and adhesive |
| D. | fibre reinforced plastic (FRP) |
| Answer» E. | |
| 422. |
__________ is not a condensation polymer. |
| A. | Teflon |
| B. | Nylon-66 |
| C. | Dacron |
| D. | Polystyrene |
| Answer» B. Nylon-66 | |
| 423. |
Softening point of high density polythene is about __________ °C.$ |
| A. | 85 |
| B. | 135 |
| C. | 165 |
| D. | 205 |
| Answer» C. 165 | |
| 424. |
Alkyd resin can not be used for making |
| A. | plasticiser |
| B. | paint & varnish |
| C. | fibres |
| D. | film forming materials |
| Answer» D. film forming materials | |
| 425. |
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 | |
| 426. |
Cross linked polymers are |
| A. | thermoplastic |
| B. | thermosetting |
| C. | either (a) or (b) |
| D. | fibres only |
| Answer» C. either (a) or (b) | |
| 427. |
Polycaprolactum is nothing but |
| A. | orlon |
| B. | nylon 6, 6 |
| C. | nylon 6 |
| D. | saran |
| Answer» D. saran | |
| 428. |
Flexible plastic pipes are made of |
| A. | high density polyethylene (HDPE). |
| B. | low density polyethylene (LDPE). |
| C. | polypropylene. |
| D. | unsaturated polyester. |
| Answer» C. polypropylene. | |
| 429. |
Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals. |
| A. | organic peroxides |
| B. | sulphuric acid |
| C. | hydroflouric acid |
| D. | none of these |
| Answer» B. sulphuric acid | |
| 430. |
Which of the following has the weakest intermolecular forces ? |
| A. | Polyisoprene |
| B. | Nylon-66 |
| C. | Polystyrene |
| D. | Bakelite |
| Answer» B. Nylon-66 | |
| 431. |
Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. |
| A. | nylon |
| B. | polyacrylonitrile |
| C. | polypropylene |
| D. | polyester |
| Answer» C. polypropylene | |
| 432. |
__________ is a homopolymer. |
| A. | Neoprene |
| B. | Bakelite |
| C. | Nylon-66 |
| D. | Terylene |
| Answer» B. Bakelite | |
| 433. |
In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres. |
| A. | polythene |
| B. | PVC |
| C. | rayon |
| D. | polyvinyl acetate |
| Answer» C. rayon | |
| 434. |
Polyesters are manufactured by the polycondensation reaction of |
| A. | dibasic acid with dihydric alcohol. |
| B. | a single monomer. |
| C. | carboxylic acid with ethylene. |
| D. | inorganic acid with ethylene glycol. |
| Answer» B. a single monomer. | |
| 435. |
Styrene butadiene rubber is commercially manufactured by |
| A. | bulk polymerisation |
| B. | suspension polymerisation |
| C. | solution polymerisation |
| D. | emulsion polymerisation |
| Answer» E. | |
| 436. |
Molecular weight of polymers are in the range of |
| A. | 10 to 103 |
| B. | 102-107 |
| C. | 107-109 |
| D. | 109-1011 |
| Answer» C. 107-109 | |
| 437. |
Epoxy resins (i.e., epoxide polymers) |
| A. | are made by addition polymerisation reaction only. |
| B. | contain an epoxy group ( ) at the ends of the polymer. |
| C. | are cross-linked polymers only. |
| D. | use emulsion polymerisation methods. |
| Answer» C. are cross-linked polymers only. | |
| 438. |
Polystyrene is a __________ plastic at room temperature. |
| A. | ductile |
| B. | brittle |
| C. | malleable |
| D. | none of these |
| Answer» C. malleable | |
| 439. |
The conversion of caprolactum in the above case is about __________ percent. |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 90 |
| Answer» E. | |
| 440. |
Nylon 6, 10 which is used for bristles making is superior to nylon 6, 6 due to its lower water absorption capacity, is a/an |
| A. | polyester |
| B. | polyamide |
| C. | polyisoprene |
| D. | polystyrene |
| Answer» C. polyisoprene | |
| 441. |
Which of the following is a natural polyamide fibre. |
| A. | Wool |
| B. | Silk |
| C. | Cotton |
| D. | None of these |
| Answer» B. Silk | |
| 442. |
Which of the following is not a thermoplastic material ? |
| A. | Epoxy polymer |
| B. | PVC |
| C. | Polystyrene |
| D. | Polythene |
| Answer» B. PVC | |
| 443. |
Which of the following is not a natural polymer ? |
| A. | Nucleic acids e.g. RNA and DNA |
| B. | Polysaccharides |
| C. | Polyisoprene |
| D. | Polyurethane |
| Answer» E. | |
| 444. |
Polythene is a/an |
| A. | addition polymerisation product. |
| B. | condensation polymerisation product. |
| C. | thermosetting material. |
| D. | none of these. |
| Answer» B. condensation polymerisation product. | |
| 445. |
Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an |
| A. | rigid foam |
| B. | engineering plastic |
| C. | thermosetting polymer |
| D. | spongy rubber |
| Answer» C. thermosetting polymer | |
| 446. |
Rexin (also called artificial leather), which is used for making table cover, automobile seat cover, shoes etc. is made by coating thick cloth with molten |
| A. | teflon |
| B. | bakelite |
| C. | SBR |
| D. | PVC |
| Answer» E. | |
| 447. |
Acrylonitrile is mainly used in the __________ industry. |
| A. | polymer |
| B. | printing |
| C. | dyeing |
| D. | photographic |
| Answer» B. printing | |
| 448. |
The monomer for the production of neoprene rubber is |
| A. | acetylene |
| B. | chloroprene |
| C. | isoprene |
| D. | none of these |
| Answer» C. isoprene | |
| 449. |
Low pressure Zeigler process of polythene manufacture |
| A. | employs a pressure of 30 kgf/cm2. |
| B. | achieves an yield of 95-98% based on ethylene. |
| C. | produces very low density polythene. |
| D. | does not use any catalyst for polymerisation. |
| Answer» C. produces very low density polythene. | |
| 450. |
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. | |