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.Management Sciences
Category: Polymer Technology
In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?
A. Bakelite (phenol formaldehyde)
B. Polyester
C. Polythene
D. Nylon-6
The physical state in which polymers exist is___________________?
A. Melts & rubber like state
B. Amorphous glassy state
C. Partially crystalline state
D. All A., B. and C.
Orlan fibre which is used as a wool substitute is __________________?
A. An amorphous polymer
B. A natural polymeric fibre
C. Polyacrylonitrile
D. Poly-methyl-methacrylate (PMMA)
Pick out the wrong statement ?
A. Cold SBR is superior as compared to hot SBR
B. Polymerisation temperature can modify the properties of SBR
C. Production of cold SBR employs lower pressure as compared to that of hot SBR
D. None of these
Which of the following is not a thermoplastic material ?
A. Epoxy polymer
B. PVC
C. Polystyrene
D. Polythene
_____________ moulding is used for shaping of thermosetting plastics exclusively?
A. Compression
B. Injection
C. Transfer
D. Extrusion
Which of the following is not present in bagasse fiber?
A. Cellulose
B. Lignin
C. Pentogens
D. None of these
Which of the following is the lowest cost plastic commercially available ?
A. Polythene
B. Teflon
C. Bakelite
D. PVC
Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces________________?
A. Nylon-6
B. Dacron
C. Polyester
D. PVC
Polythene is a/an________________?
A. Addition polymerisation product
B. Condensation polymerisation product
C. Thermosetting material
D. None of these
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