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.Management Sciences
Category: Polymer Technology
Main constituent of cotton fiber is __________________?
A. Lignin
B. Cellulose
C. Starch
D. Gelatine
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
Rayon is superior to cotton in making gauge for wound treatment, because rayon_____________________?
A. Is a synthetic polymer
B. Does not stick to the wound unlike cotton
C. Can absorb over 90% of its own weight of water
D. Both B. and C.
Linear polymers are normally_________________?
A. Thermosetting
B. Thermoplastic
C. Elastometric
D. Having extremely high softening point
Non sulphonated hard bakelites are not used for making _______________________?
A. Ion-exchange resins
B. Fountain pen barrels
C. Formica table tops
D. Combs
The monomer for the production of neoprene rubber is_________________?
A. Acetylene
B. Chloroprene
C. Isoprene
D. None of these
Synthetic polymer produced by using terephthalic acid and ethylene glycol is _________________?
A. Terylene
B. Nylon-66
C. PVC
D. Polystyrene
Tyres are made by___________________?
A. Injection moulding
B. Extrusion
C. Rotational moulding
D. Compression moulding
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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