Q.1
Softening point of high density polythene is about __________ °C.
Q.2
Zeigler process
Q.3
Rayon is superior to cotton in making gauge for wound treatment, because rayon
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
Q.5
Pick out the wrong statement.
Q.6
β - glucose is the monomer of
Q.7
Plastic tubes & pipes are generally made by __________ moulding.
Q.8
Polypropylene compared to polythene is
Q.9
Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but
Q.10
Polyurathane can not be used to make
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.
Q.12
Main constituent of cotton fibre is
Q.13
Benzoyl chloride is not used as a catalyst in the manufacture of
Q.14
Cross linked polymers are
Q.15
Starting material for the production of butadiene in India is
Q.16
Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.
Q.17
Celluloid is
Q.18
The process involved in converting rubber into a thin sheet or coating it on fabric is called
Q.19
Styrene butadiene rubber (SBR) as compared to natural rubber has
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%) ?
Q.21
Alkyd resin is a/an
Q.22
Trade name of __________ is neoprene.
Q.23
Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten
Q.24
Buna-S is also called
Q.25
Thermosetting resins/polymers as compared to thermoplastic ones are
Q.26
Thermosetting polymers as compared to thermoplastic polymers
Q.27
The major component of acrylic fibres is
Q.28
Flexible foam (for mattresses) are usually made of
Q.29
Bakelite is
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
Q.31
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their
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.
Q.33
__________ is a homopolymer.
Q.34
__________ is an addition polymer
Q.35
The synthetic fibres produced from __________ are known as rayon.
Q.36
Which of the following is the lowest cost plastic commercially available?
Q.37
Polystyrene is a light, transparent, thermoplastic material used for making
Q.38
The physical state in which polymers exist is
Q.39
Bakelite is a/an
Q.40
Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are
Q.41
Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces
Q.42
Polyurathane can not be used for making
Q.43
A copolymer of vinyl and vinylidine chloride is called
Q.44
Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature.
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.
Q.46
__________ is a natural fibre.
Q.47
Plasticisers are added to synthetic plastics to
Q.48
Polystyrene is a __________ plastic at room temperature.
Q.49
__________ is a thermosetting plastic.
Q.50
Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.
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