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.Management Sciences
Category: Polymer Technology
Plastic tubes & pipes are generally made by ______________ moulding?
A. Injection
B. Transfer
C. Extrusion
D. Compression
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
Thermosetting resins/polymers as compared to thermoplastic ones are ____________________?
A. Soluble in all organic solvents
B. More brittle
C. Formed by addition polymerisation only
D. Easily reshaped & reused
Thermoplastic resins usually____________________?
A. Remain hard as long as they are hot
B. Cannot be reclaimed from waste
C. Permanent setting resins
D. Less brittle than thermosetting resins
Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is_________________?
A. Chloroethane
B. Chloroprene
C. Isoprene
D. None of these
_____________ scrap can be recycled & reutilised?
A. Bakelite
B. Epoxy resin
C. Polythene
D. None of these
Pick out 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 intermolecular forces in thermoplastic polymers are intermediate to that of elastomers &
fibres
Zeigler process________________?
A. Produces high density polythene
B. Uses no catalyst
C. Produces low density polythene
D. Employs very high pressure
Dacron is a _____________________________?
A. Condensation polymerisation product of Hexamethylene diamine and adipic acid
B. Condensation polymerisation product of dimethyl terephthalate (DMT) and ethylene glycol
C. Thermosetting material
D. None of these
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