- (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
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- (A) Addition polymers are generally formed by chain growth polymerisation
- (B) Condensation polymers are generally formed by step growth polymerisation
- (C) Teflon is formed by step growth polymerisation
- (D) Bakelite is formed by step growth polymerisation
- (A) Polymeric fibres are never produced by addition polymerisation
- (B) Property of tackiness is exhibited by uncured rubber
- (C) Sharp melting point is not observed in thermoplastic polymers
- (D) Polythene generally has an excellent resistance to ultra violet rays
- (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic
- (B) Cross-linked branched chain polymers are either elastometric or thermosetting
- (C) Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point
- (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction
- (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
- (A) Solid fuels
- (B) Gaseous fuels
- (C) Liquid fuels
- (D) Fat coals
- (A) Inadequate ventilation
- (B) Low temperature oxidation
- (C) Storage in large heaps with small surface to volume ratio
- (D) All
- (A) Tar
- (B) Coke oven gas
- (C) Pitch
- (D) Pulverised coke
- (A) Yield of ammonia is less
- (B) Aromatic content of tar is low
- (C) H2 content in the coke oven gas is more
- (D) Calorific value of the coke oven gas is lower
- (A) Reduces the coking time
- (B) Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
- (C) Increases the loss of fine coal dust from the ovens when charging
- (D) None of these
