Practice Test: Question Set - 07
1. Most commonly used rubber vulcanization agent is
- (A) Sulphur
- (B) Bromine
- (C) Platinum
- (D) Alumina
2. Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.
- (A) 1-1000
- (B) 1000-1500
- (C) 1500-2000
- (D) 2000-2500
3. Liners of bags are usually made of
- (A) Polythene
- (B) PVC
- (C) Polypropylene
- (D) Polyesters
4. Bakelite is a/an
- (A) Addition polymer
- (B) Elastomer
- (C) Thermoplastic
- (D) None of these
5. __________ is an addition polymer
- (A) Nylon
- (B) Bakelite
- (C) Polythene
- (D) None of these
6. Density of high density polythene is about __________ gm/c.c.
- (A) 1.18
- (B) 1.05
- (C) 0.95
- (D) 0.99
7. Which of the following is an elastomer?
- (A) Thiokol
- (B) Phenol formaldehyde
- (C) Urea formaldehyde
- (D) Polystyrene
8. Non sulphonated hard bakelites are not used for making
- (A) Ion-exchange resins
- (B) Fountain pen barrels
- (C) Formica table tops
- (D) Combs
9. Plastic tubes & pipes are generally made by __________ moulding.
- (A) Injection
- (B) Transfer
- (C) Extrusion
- (D) Compression
10. The organic acid monomer in nylon-66 is
- (A) Sebacic acid
- (B) Terephthalic acid
- (C) Adipic acid
- (D) Benzoic acid
11. Diphenylamine is added to rubber to
- (A) Vulcanize it
- (B) Protect it from deterioration on exposure to air
- (C) Make it non-inflammable
- (D) Make it thermosetting
12. Which of the following polymers is used for making a non stick coating on frying pans?
- (A) Bakelite
- (B) Teflon
- (C) Perspex
- (D) PVC
13. Temperature maintained in the emulsion polymerization reactor for PVC manufacture is about __________ ° C.
- (A) -20
- (B) 50
- (C) 250
- (D) 500
14. Which of the following polymers has the tendency of decomposing before melting?
- (A) Polystyrene
- (B) Nylon
- (C) PVC
- (D) None of these
15. Plastic articles are normally produced by __________ moulding.
- (A) Green sand
- (B) Injection
- (C) Shell
- (D) Dry sand
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