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Q.1
Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness?
Phosphorous
Carbon black
Pine oil
Rosin
Q.2
Styrene butadiene rubber (SBR) is never used for making
Coated fabrics
Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
Gaskets
Soles of shoes
Q.3
Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are
5°C and 1 kgf/cm²
- 20°C and 1 kgf/cm²
0°C and 1 kgf/cm²
0°C and 3 kgf/cm²
Q.4
Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically
Polymethyl methacrylate (PMMA)
Polytetraflouroethylene(PTFE)
Polycarbonates
Phenolic resins
Q.5
Contact lenses for eyes are made of perspex, which is nothing but
Polymethylmethacrylate
Polystyrene
Unsaturated polyester
Polypropylene
Q.6
Most commonly used rubber vulcanisation agent is
Sulphur
Bromine
Platinum
Alumina
Q.7
A copolymer is formed by the combination of two or more monomer molecules
In a chain without the elimination of water
With the elimination of small amount of water
Of the same monomer by elimination of small molecules of water
None of these
Q.8
Orlan fibre which is used as a wool sub stitute is
An amorphous polymer
A natural polymeric fibre
Polyacrylonitrile
Polymethylmethacrylate (PMMA)
Q.9
Which of the following is a natural polyamide fibre.
Wool
Silk
Cotton
None of these
Q.10
__________ is not a polyester fibre.
Terylene
Dacron
Nylon
Polyacrylonitrite
Q.11
Which of the following polymers belong to the class of formaldehyde resin?
Melamine resins
Teflon
Dacron
None of these
Q.12
Dacron (or terylene) fibres as compared to nylon fibres have
Better heat & acid resistant properties
Poorer resistance to alkalis
Poorer dyeability
All of the above
Q.13
Condensation polymerisation of __________ produces bakelite.
Propylene
Phenol & formaldehyde
Phenol & acetaldehyde
Urea & formaldehyde
Q.14
Polymethyl methacrylate, which is an acrylic resin, is also called
Thiokol
Plexiglass or lucite
Dacron
Teflon
Q.15
Hot drink (e.g, tea) cups are usually made of
Polystyrene
Polythene
Polypropylene
PVC
Q.16
90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
-5
10-30
250-280
500-600
Q.17
Zeigler - Natta catalyst (AlR₃ - AlCl₃) is used in the polymerisation of
Vinyl acetate
Vinyl chloride
Propylene
Styrene
Q.18
Size range of polymer molecules varies from __________ metre.
10⁻² to 10⁻⁵
10⁻⁴ to 10⁻⁷
10⁻¹ to 10⁻²
10⁻⁸ to 10⁻¹⁰
Q.19
__________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.
Fibrous
Leathery
Rubbery
Hard
Q.20
The starting material used for the manufacture of caprolactum is
Ethyl benzene
Cyclohexane
Ethylene glycol
DMT
Q.21
__________ polythene is most prone to stress-cracking
High density
Low density
Cross-linked
Linear low density
Q.22
Maximum consumption of polymers is in
Electrical insulation
Toys making
Coating and films
Packaging
Q.23
Vinyl flooring is done using __________ sheets.
Polypropylene
PVC
Polythene
Polyvinyl acetate
Q.24
Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.
Improving the stretchability
Dyeing/colouring
Detergent solution washing
Glycol soaking
Q.25
__________ scrap can be recycled & reutilised.
Bakelite
Epoxy resin
Polythene
None of these
Q.26
Polycondensation reaction of polymerisation
Does not produce linear polymers
Produces only thermoplastic material
Produces epoxy polymers
Does not need any catalyst
Q.27
Most of the plastics are safe to be used upto a maximum temperature of __________ °C.
100
150
350
450
Q.28
Viscosity of a polymer solution or melt
Decreases with increase in molecular weight
Decreases with increase in temperature
Increases with increase in temperature
Does not vary with temperature rise
Q.29
All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it can not be used for the production of plastic
Filaments
Pipes
Buckets
Tubings
Q.30
Addition of stabiliser during PVC manufacture is done to
Improve its impact strength
Improve its elasticity
Reduce the melt viscosity & glass transition temperature
Prevent its thermal degradation
Q.31
Addition polymerisation is not involved in the manufacture of
Low density polythene
Poly vinyl chloride
Polystyrene
Polyhexamethylene adipamide
Q.32
The organic acid monomer in nylon 66 is
Sebasic acid
Terephthalic acid
Adipic acid
Benzoic acid
Q.33
Lavatory cisterns are normally made of
Expanded polystyrene
Saturated polyester
Perspex
PVC
Q.34
The only natural thermoplastic resin, which is a product of animal life is
Rosin
Shellac
Amber
Copal
Q.35
Cation exchange resins used in water treatment is made from __________ resin.
Urea formaldehyde
Epoxy
Amino
Phenolic
Q.36
Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.
Resorcinol
Phenol
Para-cresol
Melamine
Q.37
Epoxy resins (i.e., epoxide polymers)
Are made by addition polymerisation reaction only
Contain an epoxy group ( ##### ) at the ends of the polymer
Are cross-linked polymers only
Use emulsion polymerisation methods
Q.38
Condensation polymerisation is not involved in the manufacture of
Teflon
Polythene
Terylene
Nylon
Q.39
In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of
Cross linked polystyrene
Phenol formaldehyde resins
Polyesters
Polyamides
Q.40
Paper like thin plastic articles can be produced by
Blow moulding
Vacuum thermo forming
Injection moulding
None of these
Q.41
Pick out the correct statement.
Plastics are good conductors of heat and electricity
All the polymers are highly crystalline in nature
Polymers can be vaporised by heating to a very high temperature
The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation
Q.42
Which of the following is not a natural polymer?
Nucleic acids e.g. RNA and DNA
Polysaccharides
Polyisoprene
Polyurethane
Q.43
Vulcanisation of rubber does not increase its
Softness
Oxidation resistance
Weight & strength
Elasticity & water solubility
Q.44
__________ is not a condensation polymer.
Teflon
Nylon-66
Dacron
Polystyrene
Q.45
Thermosetting plastic materials
Can be repeatedly melted
Is useful for melt casting
Can not be melted after forming
Is useful for spinning
Q.46
Which of the following polymers shows the highest anti-tacking properties?
Melamine formaldehyde resin
Phenolic resin
Epoxy resin
Alkyd resin
Q.47
Bakelite (phenol-formaldehyde) resin can not be used as
Decorative paint
Decorative laminates
Electrical insulation
Glass reinforced plastics
Q.48
Properties of a polymer is affected by the
Chain length
Intermolecular forces
Branching & cross-linking
All of the above
Q.49
Which of the following polymers has the tendency of decomposing before melting?
Polystyrene
Nylon
PVC
None of these
Q.50
Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.
Polyurathane
Polysulphone
Polycarbonate
Polyester
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