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1) Polymerisation of poly functional monomers produces polymers having_________________? a. Good mechanical strength b. Low viscosity c. Low melting point d. None of these
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2) Neoprene is a___________________? a. Monomer b. Synthetic rubber c. Polyester d. None of these
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3) 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
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4) Thiokol is nothing but____________________? a. Polysulphide rubber b. Polyamide fibre c. Engineering plastic d. Expanded polystyrene
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5) ________________ is produced by polymerisation of chloroprene? a. Thiokol (a polysulphide rubber) b. Butyl rubber c. Neoprene d. Polyurethane rubber
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6) ______________ fibres are made of polyamides? a. Dacron b. Nylon c. Rayon d. Orion
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7) Zeigler – Natta catalyst (AlR3 – AlCl3) is used in the polymerisation of_________________? a. Vinyl acetate b. Vinyl chloride c. Propylene d. Styrene
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8) The major component of acrylic fibers is__________________? a. Polyamides b. Polyolefins c. Polyacrylonitrile d. Polyesters
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9) Dacron (or Treylene) fibres as compared to nylon fibres have_____________________? a. Better heat & acid resistant properties b. Poorer resistance to alkalis c. Poorer dyeability d. All A., B. and C.
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10) Dacron is a/an___________________? a. Addition polymer b. Condensation polymer c. Polyester d. Both B. and C.
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11) Which of the following low molecular weight (<104), soft & waxy polymer is used in „chewing gum‟ ? a. Cellulose acetate b. Polyvinyl acetate c. Thiokol d. PVC
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12) Trade name of ______________ is neoprene? a. Polychlorophrene b. Polyisoprene c. Polytetrafluoroethylene d. Poly vinyl acetate
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13) Vulcanisation of rubber_____________________? a. Decreases its tensile strength b. Increases its ozone & oxygen reactivity c. Increases its oil & solvent resistance d. Converts its plasticity into elasticity
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14) _____________ tubes are good substitute for human blood vessels on heart by-pass operation? a. PVC b. Polythene c. Teflon/Dacron d. Polystyrene
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15) 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
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16) Visco-elastic behaviour exhibited by plastics is a ______________ like behaviour? a. Solid b. Liquid c. Combination of solid & liquid d. Neither solid nor liquid
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17) Benzoyl chloride is not used as a catalyst in the manufacture of___________________? a. Polystyrene b. Polyvinyl acetate c. Polypropylene d. Polyvinyl chloride-co-vinyl acetate
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18) _____________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate? a. Fibrous b. Leathery c. Rubbery d. Hard
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19) Linear polymers are normally_________________? a. Thermosetting b. Thermoplastic c. Elastometric d. Having extremely high softening point
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20) Condensation polymerisation is not involved in the manufacture of_________________? a. Teflon b. Polythene c. Terylene d. Nylon
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