MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
In which of the electric power generation system, the operating cost is minimum ? |
| A. | Thermal |
| B. | Nuclear |
| C. | Hydroelectric |
| D. | Fast breeder reactor |
| Answer» D. Fast breeder reactor | |
| 652. |
The rate controlling step in the manufacture of silicone rubber is the |
| A. | polymer termination step. |
| B. | condensation of siloxane to silicone. |
| C. | initial hydrolysis of silicone monomer. |
| D. | none of these. |
| Answer» D. none of these. | |
| 653. |
The time required for half of the __________ of a radioactive isotope to decay is called its half life. |
| A. | nuclei |
| B. | electrons |
| C. | protons |
| D. | neutrons |
| Answer» B. electrons | |
| 654. |
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. | |
| 655. |
Vulcanisation of raw rubber makes it |
| A. | soft |
| B. | less elastic |
| C. | plastic |
| D. | tacky |
| Answer» C. plastic | |
| 656. |
Epoxy resin is |
| A. | not used for surface coating. |
| B. | a good abrasive. |
| C. | an elastomer. |
| D. | a polyester. |
| Answer» C. an elastomer. | |
| 657. |
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 | |
| 658. |
Which of the following is a copolymer ? |
| A. | Polystyrene |
| B. | SBR |
| C. | P.T.F.E. |
| D. | Polypropylene |
| Answer» C. P.T.F.E. | |
| 659. |
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 | |
| 660. |
Cross linked polymers are |
| A. | thermoplastic |
| B. | thermosetting |
| C. | either (a) or (b) |
| D. | fibres only |
| Answer» C. either (a) or (b) | |
| 661. |
Thermosplastic materials |
| A. | do not soften on application of heat. |
| B. | are heavily branched molecules. |
| C. | are solvent insoluble. |
| D. | none of these. |
| Answer» E. | |
| 662. |
Cellulose content in bomboo fibre is about __________ percent. |
| A. | 10 |
| B. | 20 |
| C. | 50 |
| D. | 85 |
| Answer» D. 85 | |
| 663. |
Properties of a polymer is affected by the |
| A. | chain length. |
| B. | intermolecular forces. |
| C. | branching & cross-linking. |
| D. | all (a), (b). |
| Answer» E. | |
| 664. |
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. | |
| 665. |
Which of the following has the weakest intermolecular forces ? |
| A. | Polyisoprene |
| B. | Nylon-66 |
| C. | Polystyrene |
| D. | Bakelite |
| Answer» B. Nylon-66 | |
| 666. |
In condensation polymerisation as compared to addition polymerisation |
| A. | the monomers are unsaturated compounds. |
| B. | no co-product is lost. |
| C. | the monomers contain two functional groups. |
| D. | generally only one monomer is involved |
| Answer» D. generally only one monomer is involved | |
| 667. |
Polyvinyl acetate is never used for making |
| A. | moulded articles |
| B. | fibres |
| C. | adhesives |
| D. | all (a), (b) & (c) |
| Answer» B. fibres | |
| 668. |
Vulcanisation of rubber does not increase its |
| A. | elasticity |
| B. | plasticity |
| C. | ductility |
| D. | none of these |
| Answer» C. ductility | |
| 669. |
In nylon-6, the number 6 represents the total number of |
| A. | carbon atoms in the ring. |
| B. | carbon atoms in the linear polymer chain. |
| C. | nitrogen atoms in the ring. |
| D. | hydrogen atoms in the ring. |
| Answer» C. nitrogen atoms in the ring. | |
| 670. |
Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids ? |
| A. | Starch |
| B. | Cellulose |
| C. | Proteins |
| D. | Nucleic acids |
| Answer» D. Nucleic acids | |
| 671. |
Nylon-66 is manufactured from |
| A. | adipic acid and hexamenthylene diamine. |
| B. | caprolactum. |
| C. | maleic anhydride and hexamethylene diamine. |
| D. | dimethyl terephthalate (DMT) and ethylene glycol. |
| Answer» B. caprolactum. | |
| 672. |
Poly tetra flouro ethylene (PTFE) is known as |
| A. | dacron |
| B. | teflon |
| C. | bakelite |
| D. | celluloid |
| Answer» C. bakelite | |
| 673. |
__________ is normally used for the manufacture of refrigerator components and transistor parts. |
| A. | Polyproylene |
| B. | Polystyrene |
| C. | Polyester |
| D. | Polyurathene |
| Answer» C. Polyester | |
| 674. |
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 ? |
| A. | Ethylene glycol |
| B. | Stearic acid estors |
| C. | Tricresyl phosphate |
| D. | Esters of phthalic acid |
| Answer» B. Stearic acid estors | |
| 675. |
Rain coats are made of |
| A. | neoprene |
| B. | PVC |
| C. | polyurathane |
| D. | SBR |
| Answer» C. polyurathane | |
| 676. |
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. | |
| 677. |
Condensation polymerisation of __________ produces bakelite. |
| A. | propylene |
| B. | phenol & formaldehyde |
| C. | phenol & acetaldehyde |
| D. | urea & formaldehyde |
| Answer» C. phenol & acetaldehyde | |
| 678. |
__________ is not a condensation polymer. |
| A. | Teflon |
| B. | Nylon-66 |
| C. | Dacron |
| D. | Polystyrene |
| Answer» B. Nylon-66 | |
| 679. |
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. | |
| 680. |
__________ practically possess no elasticity. |
| A. | Vulcanite or ebonite |
| B. | Spandex fibre |
| C. | Polysulphide rubber |
| D. | Epoxy resin |
| Answer» B. Spandex fibre | |
| 681. |
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. | |
| 682. |
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. | |
| 683. |
The only natural thermoplastic resin, which is a product of animal life is |
| A. | rosin |
| B. | shellac |
| C. | amber |
| D. | copal |
| Answer» C. amber | |
| 684. |
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 | |
| 685. |
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). | |
| 686. |
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. | |
| 687. |
Which of the following is not a condensation polymer ? |
| A. | Bakelite |
| B. | Melamine polymer |
| C. | Polymethylmethacrylate (PMMA) |
| D. | None of these |
| Answer» D. None of these | |
| 688. |
__________ polythene is most prone to stress-cracking |
| A. | High density |
| B. | Low density |
| C. | Cross-linked |
| D. | Linear low density |
| Answer» B. Low density | |
| 689. |
Collapsible tubes for tooth paste are produced by __________ extrusion. |
| A. | direct |
| B. | indirect |
| C. | impact |
| D. | none of these |
| Answer» D. none of these | |
| 690. |
__________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR. |
| A. | Percent elongation |
| B. | Resilience |
| C. | Freezing point |
| D. | Strength |
| Answer» C. Freezing point | |
| 691. |
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. | |
| 692. |
The starting material used for the manufacture of caprolactum is |
| A. | ethyl benzene |
| B. | cyclohexane |
| C. | ethylene glycol |
| D. | DMT |
| Answer» C. ethylene glycol | |
| 693. |
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 | |
| 694. |
Styrene which is a monomer for the production of polystyrene, is commercially produced by the |
| A. | catalytic dehydrogenation of ethyl benzene. |
| B. | dehydration of ethyl alcohol followed by hydrogenation. |
| C. | reacting ethylene oxide with acetal-dehyde. |
| D. | fermentation of starch. |
| Answer» B. dehydration of ethyl alcohol followed by hydrogenation. | |
| 695. |
Softening point of high density polythene is about __________ C. |
| A. | 85 |
| B. | 135 |
| C. | 165 |
| D. | 205 |
| Answer» C. 165 | |
| 696. |
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. | |
| 697. |
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 | |
| 698. |
Maximum consumption of polymers is in |
| A. | electrical insulation |
| B. | toys making |
| C. | coating and films |
| D. | packaging |
| Answer» D. packaging | |
| 699. |
Glyptal used in the manufacture of paints & lacquers is a __________ polymer. |
| A. | polyamide |
| B. | polystyrene |
| C. | polyester |
| D. | polyacrylonitrile |
| Answer» D. polyacrylonitrile | |
| 700. |
Low density polythene as compared to high density polythene is |
| A. | harder |
| B. | tougher |
| C. | chemically inert |
| D. | more flexible |
| Answer» E. | |