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Quiz 5
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Q.1
Pick out the wrong statement.
Linear polymers are formed from bifunctional groups only and are normally thermoplastic
Cross-linked branched chain polymers are either elastometric or thermosetting
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
Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction
Q.2
Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber?
Carbon
Alkylated diphenyl amine
Thiokol
Magnesium
Q.3
Which of the following polymers does not belong to the class of polyacrylate polymer?
PMMA
Polyacrylonitrile
Polyethyl acrylate
None of these
Q.4
__________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine.
Epoxy
Amino
Alkyd
Phenolic
Q.5
Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its
Tensile strength
Chemical resistance
Flexibility
All of the above
Q.6
In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres.
Polythene
PVC
Rayon
Polyvinyl acetate
Q.7
Vulcanisation of raw rubber makes it
Soft
Less elastic
Plastic
Tacky
Q.8
Nylon-6 as compared to nylon-66 is
Harder
More abrasion resistant
Having higher melting point
None of these
Q.9
Buna-S is a __________ material.
Fibrous
Plastic
Resinous
Rubbery
Q.10
Density of high density polythene is about __________ gm/c.c.
1.18
1.05
0.95
0.99
Q.11
Which of the following is a polymer of hexamethylene diamine and adipic acid?
Nylon-6
Nylon-66
Nylon-6, 10
Epoxy resin
Q.12
Linear polymers are normally
Thermosetting
Thermosplastic
Elastometric
Having extremely high softening point
Q.13
Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation?
PVC
Bakelite
PTFE
Epoxy resin
Q.14
Perspex can be used as a substitute of glass. Its monomer is
Methyl methacrylate
DMT
Butadiene
Tetrafluroethylene
Q.15
Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser?
Ethylene glycol
Stearic acid estors
Tricresyl phosphate
Esters of phthalic acid
Q.16
Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
Glycerol
Nitro cellulose
Camphor
None of these
Q.17
Tyres are made by
Injection moulding
Extrusion
Rotational moulding
Compression moulding
Q.18
Starting material for the production of SBR is
Ethyl alcohol
Ethylene
Both A & B
Neither A nor B
Q.19
Nylon-66 compared to nylon-6 has
Lower melting point
More abrasion resistant properties
Higher hardness
All of the above
Q.20
Which of the following is not a natural fibre?
Silk
Viscose rayon
Wool
Cotton
Q.21
Thermoplastic resins usually
Remain hard as long as they are hot
Can not be reclaimed from waste
Permanent setting resins
Less brittle than thermosetting resins
Q.22
Thermosetting materials
Are cross-linked molecules
Soften on application of heat
Are solvent soluble
None of these
Q.23
Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
Ammonium alum
Potassium alum
Both A & B
Neither A nor B
Q.24
Viscose rayon is
Cellulose nitrate
Regenerated cellulose nitrate
Regenerated cellulose acetate
None of these
Q.25
Vulcanisation of rubber
Decreases its tensile strength
Increases its ozone & oxygen reactivity
Increases its oil & solvent resistance
Converts its plasticity into elasticity
Q.26
__________ tubes are good substitude for human blood vessels onrheart by-pass operation.
PVC
Polythene
Teflon/dacron
Polystyrene
Q.27
Pick out the wrong statement.
Addition polymers are generally formed by chain growth polymerisation
Condensation polymers are generally formed by step growth polymerisation
Teflon is formed by step growth polymerisation
Bakelite is formed by step growth polymerisation
Q.28
Thermosplastic materials
Do not soften on application of heat
Are heavily branched molecules
Are solvent insoluble
None of these
Q.29
Which of the following is an inorganic polymer?
Teflon
Perspex
Silicones
Bakelite
Q.30
__________ practically possess no elasticity.
Vulcanite or ebonite
Spandex fibre
Polysulphide rubber
Epoxy resin
Q.31
Nylon 6
as compared to
nylon 6, 6
has lower
Abrasion resistance
Thermal stability
Adhesion to rubber
Hardness
Q.32
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher
Densities
Melting point
Tensile strength
Hardness, rigidity & brittleness
Q.33
Terylene is a/an
Addition polymer
Poly amide
Homopolymer
None of these
Q.34
Styrene butadiene rubber (SBR) is
A natural rubber
Another name of silicone rubber
A synthetic polymer
A synthetic monomer
Q.35
Synthetic rubber
Deforms, if stretched to double of its original dimension
Is brittle at low temperature
Is softer at higher temperature
Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases
Q.36
Which of the following is generally not used as eord for synthetic rubber tyre casing?
Dacron
Nylon
Cellulose
None of these
Q.37
Teflon is
Phenol formaldehyde
An inorganic polymer
Polytetra florouethylene (PTFE)
A monomer
Q.38
Styrene butadiene rubber is commercially manufactured by
Bulk polymerisation
Suspension polymerisation
Solution polymerisation
Emulsion polymerisation
Q.39
Styrene which is a monomer for the production of polystyrene, is commercially produced by the
Catalytic dehydrogenation of ethyl benzene
Dehydration of ethyl alcohol followed by hydrogenation
Reacting ethylene oxide with acetal-dehyde
Fermentation of starch
Q.40
Which of the following is a copolymer?
PVC
Bakelite
Polythene
Teflon
Q.41
Which of the following is a copolymer?
Polystyrene
SBR
P.T.F.E.
Polypropylene
Q.42
Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its
Elasticity
Strength
Plasticity
Weathering characteristics
Q.43
Branched chain polymers compared to linear polymers have higher
Density
Tensile strength
Melting point
Degree of irregularity in atomic packing
Q.44
The rate controlling step in the manufacture of silicone rubber is the
Polymer termination step
Condensation of siloxane to silicone
Initial hydrolysis of silicone monomer
None of these
Q.45
In nylon-6, the number 6 represents the total number of
Carbon atoms in the ring
Carbon atoms in the linear polymer chain
Nitrogen atoms in the ring
Hydrogen atoms in the ring
Q.46
Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not used
For surface coating of automobiles & air crafts
For fibre making
As plasticiser for PVC & nitrocellulose
For film forming materials
Q.47
Terylene is
Same as dacron
A polyester
Both A & B
Neither A nor B
Q.48
Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces
Epoxy resin
Polyamide
Alkyd resin
Phenolic resin
Q.49
Pick out the wrong statement.
For the manufacture of styrene, the major raw materials are benzene and ethylene
One inportant copolymer of styrene is SBR, which is widely used in the manufacture of automobile tyres
Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis
Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available
Q.50
Which of the following is not a condensation polymer?
Bakelite
Melamine polymer
Polymethylmethacrylate (PMMA)
None of these
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