Practice Test: Question Set - 19
1. Thermosetting materials
- (A) Are cross-linked
molecules
- (B) Soften on application
of heat
- (C) Are solvent soluble
- (D) None of these
2. In nylon-6, the number 6 represents the total number of
- (A) Carbon atoms in the
ring
- (B) Carbon atoms in the
linear polymer chain
- (C) Nitrogen
atoms in the ring
- (D) Hydrogen atoms in the
ring
3. Polymers are
- (A) Micro-molecules
- (B) Macromolecules
- (C) Sub-micromolecules
- (D) None
of these
4. Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten
- (A) Saturated
polyester
- (B) Polyurethane
- (C) Polystyrene
- (D) Either (b) or (c)
5. __________ polythene is most prone to stress-cracking
- (A) High
density
- (B) Low
density
- (C) Cross-linked
- (D) Linear
low density
6. Which of the following is not a condensation polymer?
- (A) Bakelite
- (B) Melamine
polymer
- (C) Poly-methyl-methacrylate
(PMMA)
- (D) None of these
7. Styrene which is a monomer for the production of polystyrene, is commercially produced by the
- (A) Catalytic
dehydrogenation of ethyl benzene
- (B) Dehydration of ethyl
alcohol followed by hydrogenation
- (C) Reacting ethylene
oxide with acetaldehyde
- (D) Fermentation of starch
8. Phenol formaldehyde
- (A) Employs
addition polymerization
- (B) Employs
condensation polymerization
- (C) Is
a monomer
- (D) Is
an abrasive material
9. 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
10. 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)
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