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Q.1
Softening point of high density polythene is about __________ °C.
85
135
165
205
Q.2
Zeigler process
Produces high density polythene
Uses no catalyst
Produces low density polythene
Employs very high pressure
Q.3
Rayon is superior to cotton in making gauge for wound treatment, because rayon
Is a synthetic polymer
Does not stick to the wound unlike cotton
Can absorb over 90% of its own weight of water
Both B & C
Q.4
Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is
Nylon-66
Teflon
Polyester
Bakelite
Q.5
Pick out the wrong statement.
Polystyrene is a thermoplastic polymer
Protein is a natural polymer
Neoprene is a natural rubber
Polythene is a copolymer, while SBR is a homopolymer
Q.6
β - glucose is the monomer of
Cellulose
Starch
Protein
None of these
Q.7
Plastic tubes & pipes are generally made by __________ moulding.
Injection
Transfer
Extrusion
Compression
Q.8
Polypropylene compared to polythene is
Harder
Stronger
Lighter
All of the above
Q.9
Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but
Polyacrylonitrile
Polyamide
Saturated polyester
Alkyd resin
Q.10
Polyurathane can not be used to make
Automobile cushion
Thermal insulation in refrigerator
Coating and adhesive
Fibre reinforced plastic (FRP)
Q.11
Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.
Organic peroxides
Sulphuric acid
Hydroflouric acid
None of these
Q.12
Main constituent of cotton fibre is
Lignin
Cellulose
Starch
Gelatine
Q.13
Benzoyl chloride is not used as a catalyst in the manufacture of
Polystyrene
Polyvinyl acetate
Polypropylene
Polyvinyl chloride-co-vinylacetate
Q.14
Cross linked polymers are
Thermoplastic
Thermosetting
Either A or B
Fibres only
Q.15
Starting material for the production of butadiene in India is
Naphthalene
Benzol
Ethyl alcohol
Phthalic anhydride
Q.16
Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.
-20
50
250
500
Q.17
Celluloid is
Cellulose acetate
Regenerated cellulose
Cellulose nitrate
Cellulose acetate butyrate
Q.18
The process involved in converting rubber into a thin sheet or coating it on fabric is called
Extrusion
Mastication
Calendering
Vulcanisation
Q.19
Styrene butadiene rubber (SBR) as compared to natural rubber has
Poor tensile strength
Poorer resistance
Greater amount of heat build up heavy loading
All of the above
Q.20
Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m². Which of the following polymers has the maximum film elongation (of the order of 100%) ?
Water impermeable cellophane
Polythene
Cellulose acetate
Teflon
Q.21
Alkyd resin is a/an
Polyamide
Polyester
Polyolefin
Addition polymer
Q.22
Trade name of __________ is neoprene.
Polychloroprene
Polyisoprene
Polytetraflouroethylene
Poly vinyl acetate
Q.23
Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten
Saturated polyester
Polyurathane
Polystyrene
Either B or C
Q.24
Buna-S is also called
Polyurathane
SBR
Teflon
Bakelite
Q.25
Thermosetting resins/polymers as compared to thermoplastic ones are
Soluble in all organic solvents
More brittle
Formed by addition polymerisation only
Easily reshaped & reused
Q.26
Thermosetting polymers as compared to thermoplastic polymers
Are formed by addition polymerisation
Have three dimensional structure
Have linear structure
None of these
Q.27
The major component of acrylic fibres is
Polyamides
Polyolefins
Polyacrylonitrile
Polyesters
Q.28
Flexible foam (for mattresses) are usually made of
PVC
Silicone rubber
Polyurethanes
Polyamides
Q.29
Bakelite is
Same as polytetra flouro ethylene (PTFE)
An inorganic polymer
Same as thermoset phenol formaldehyde
Not a polymer
Q.30
SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at
1:3
3:1
1:2
2:1
Q.31
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their
Molecular sizes
Magnitude of intermolecular forces
Resistance to heat
Polymerisation mechanism
Q.32
In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.
Viscose rayon
Acrylic
Polyvinyl acetate
Saturated polyester
Q.33
__________ is a homopolymer.
Neoprene
Bakelite
Nylon-66
Terylene
Q.34
__________ is an addition polymer
Nylon
Bakelite
Polythene
None of these
Q.35
The synthetic fibres produced from __________ are known as rayon.
Lignin
Cellulose
Polyamides
Ethylene glycol
Q.36
Which of the following is the lowest cost plastic commercially available?
Polythene
Teflon
Bakelite
PVC
Q.37
Polystyrene is a light, transparent, thermoplastic material used for making
Toys and combs
Packaging bags
Non-sticking utensils
Electrical insulation
Q.38
The physical state in which polymers exist is
Melts & rubber like state
Amorphous glassy state
Partially crystalline state
All of the above
Q.39
Bakelite is a/an
Addition polymer
Elastomer
Thermoplastic
None of these
Q.40
Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are
50°C and 3 - 4 kg/cm²
50°C and 1 kgf/cm²
250°C and 10 kgf/cm²
250°C and 1 kgf/cm²
Q.41
Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces
Nylon-6
Dacron
Polyester
PVC
Q.42
Polyurathane can not be used for making
Mattresses & foam
Coating material
Adhesives
Bottles
Q.43
A copolymer of vinyl and vinylidine chloride is called
Treylene
Orlon
Saran
Dacron
Q.44
Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature.
Nylon
Polyacrylonitrile
Polypropylene
Polyester
Q.45
Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
Acrylic
Polyester
Nylon 6:6
Polypropylene
Q.46
__________ is a natural fibre.
Cellulose
Dacron
Nylon-6
None of these
Q.47
Plasticisers are added to synthetic plastics to
Impart flexibility
Improve workability during fabrication
Develop new improved properties not present in the original resin
All of the above
Q.48
Polystyrene is a __________ plastic at room temperature.
Ductile
Brittle
Malleable
None of these
Q.49
__________ is a thermosetting plastic.
PVC
Polythene
Bakelite
Polystyrene
Q.50
Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.
-20 to 25
50 to 75
100 to 150
250-280
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