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
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Vulcanisation of raw rubber makes it
A. Soft
B. Less elastic
C. Plastic
D. Tacky
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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
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Perspex can be used as a substitute of glass. Its monomer is
A. Methyl methacrylate
B. DMT
C. Butadiene
D. Tetrafluroethylene
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Starting material for the production of SBR is
A. Ethyl alcohol
B. Ethylene
C. Both A & B
D. Neither A nor B
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Which of the following polymers does not belong to the class of polyacrylate polymer?
A. PMMA
B. Polyacrylonitrile
C. Polyethyl acrylate
D. None of these
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__________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine.
A. Epoxy
B. Amino
C. Alkyd
D. Phenolic
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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 of the above
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Which of the following is a polymer of hexamethylene diamine and adipic acid?
A. Nylon-6
B. Nylon-66
C. Nylon-6, 10
D. Epoxy resin
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Linear polymers are normally
A. Thermosetting
B. Thermosplastic
C. Elastometric
D. Having extremely high softening point
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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
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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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Nylon-66 compared to nylon-6 has
A. Lower melting point
B. More abrasion resistant properties
C. Higher hardness
D. All of the above
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Which of the following is not a natural fibre?
A. Silk
B. Viscose rayon
C. Wool
D. Cotton
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__________ tubes are good substitude for human blood vessels onrheart by-pass operation.
A. PVC
B. Polythene
C. Teflon/dacron
D. Polystyrene
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Polycaprolactum is also known as
A. Nylon-66
B. Nylon-6
C. Teflon
D. SBR
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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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Polypropylene is preferred to polythene, because the former is
A. Non-inflammable
B. Harder
C. Stronger
D. Both B & C
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Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent.
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Unbreakable crockeries are made from __________ polymers.
A. Polystyrene
B. Melamine
C. Polyurathane
D. None of the above
Select an option to see the answer and solution.
