- (A) Thermoplastic
- (B) Melamine
- (C) Addition
- (D) None of these
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- (A) Polyurethane
- (B) Phenol formaldehyde
- (C) Polychlorophrene
- (D) Styrene butadiene rubber (SBR)
- (A) Addition polymerisation product
- (B) Condensation polymerisation product
- (C) Thermosetting material
- (D) None of these
- (A) Its softening
- (B) A treatment to retard its deterioration due to oxidation
- (C) Improving its curing rate
- (D) Depression of its freezing point
- (A) Elastomers
- (B) Fibres
- (C) Thermoplastics
- (D) Thermosetting polymers
- (A) Harder
- (B) More abrasion resistant
- (C) Having higher melting point
- (D) None of these
- (A) Harder
- (B) Stronger
- (C) Lighter
- (D) All
- (A) For the manufacture of styrene, the major raw materials are benzene and ethylene
- (B) One important copolymer of styrene is SBR, which is widely used in the manufacture of automobile tyres
- (C) Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis
- (D) Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available
- (A) Greater the degree of cross-linking in the polymer, lesser is its solubility
- (B) Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents
- (C) Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent
- (D) High molecular weight polymers on dissolving gives solution of very low viscosity
- (A) 1: 3
- (B) 3 : 1
- (C) 1 : 2
- (D) 2 : 1
