A. Plastics are good conductors of heat and electricity
B. All the polymers are highly crystalline in nature
C. Polymers can be vaporised by heating to a very high temperature
D. The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of
polymerisation
Related Mcqs:
- Pick out the wrong statement ?
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 - Pick out the wrong statement regarding the solubility characteristics of high polymers?
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 - 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 - Pick out the wrong statement ?
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 - Pick out the wrong statement ?
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 - Pick out the wrong statement ?
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 - Pick out the wrong statement?
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 - Pick out the wrong statement ?
A. Polystyrene is a thermoplastic polymer
B. Protein is a natural polymer
C. Neoprene is a natural rubber
D. Polythene is a copolymer, while SBR is a homopolymer - Pick out the wrong statement?
A. Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre
B. Crimp is a measure of the difference between the length of the straightened and unstraightened fibre
C. Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning
D. Nylon fibres have greater water absorption capacity than polyester fibres - Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?
A. Poor tensile strength
B. Poorer resistance
C. Greater amount of heat build up heavy loading
D. All A., B. and C.
Mcq Added by: admin
