Practice Polymer Technology Multiple Choice Questions with Answers Quiz-11

Q.1.

Rayon is a __________ fibre.

cellulosic
polyamide
polyester
natural

Q.2.

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.3.

Polyurathane can not be used for making

mattresses & foam
coating material
adhesives
bottles

Q.4.

Polypropylene compared to polythene is

harder
stronger
lighter
all (a), (b) and (c)

Q.5.

Low pressure Zeigler process of polythene manufacture

employs a pressure of 30 kgf/cm².
achieves an yield of 95-98% based on ethylene.
produces very low density polythene.
does not use any catalyst for polymerisation.

Q.6.

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.7.

Bristles of tooth brushes are made of

nylon-6
nylon-66
polystyrene
PVC

Q.8.

Pick out the wrong statement.

Cold SBR is superior as compared to hot SBR.
Polymerisation temperature can modify the properties of SBR.
Production of cold SBR employs lower pressure as compared to that of hot SBR.
None of these.

Q.9.

Alkyd resin can not be used for making

plasticiser
paint & varnish
fibres
film forming materials

Q.10.

The monomer for the production of neoprene rubber is

acetylene
chloroprene
isoprene
none of these

Q.11.

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.12.

Valcunisation of rubber decreases its

tensile strength.
resistance to organic solvents.
tackiness.
working temperature range.

Q.13.

Plastic articles are normally produced by __________ moulding.

green sand
injection
shell
dry sand

Q.14.

Molecular weight of polymers are in the range of

10 to 10³
10²-10⁷
10⁷-10⁹
10⁹-10¹¹

Q.15.

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.16.

Commercial production of polypropylene employs __________ polymerisation.

emulsion
suspension
solution
bulk

Q.17.

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.18.

__________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).

Unsaturated polyester
Alkyd resins
Saturated polyester
Amino resins

Q.19.

Which of the following is an elastomer ?

Thiokol
Phenol formaldehyde
Urea formaldehyde
Polystyrene

Q.20.

Polystyrene is a __________ plastic at room temperature.

ductile
brittle
malleable
none of these

Q.21.

Amino resins are used in paper treatment to improve its

wet tear and bursting strength.
folding endurance
wet rub resistance
all (a), (b) & (c)

Q.22.

Starting material for the production of butadiene in India is

naphthalene
benzol
ethyl alcohol
phthalic anhydride

Q.23.

Pick out the wrong statement.

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.
Crimp is a measure of the difference between the length of the straightened and unstraightend fibre.
Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning.
Nylon fibres have greater water absorption capacity than polyester fibres.

Q.24.

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.25.

Thermocole (expanded polystyrene) is not used for

low temperature thermal insulation as in refrigerator and air conditioners.
accoustic control and ceiling for building.
high temperature thermal insulation in furnaces.
packing of delicate electronic gadgets.

Q.26.

The physical state in which polymers exist is

melts & rubber like state.
amorphous glassy state.
partially crystalline state.
all (a), (b) and (c).

Q.27.

Buna-S is also called

polyurathane
SBR
teflon
bakelite

Q.28.

Main constituent of cotton fibre is

lignin
cellulose
starch
gelatine

Q.29.

Orlon is

a copolymer.
a condensation polymer.
obtained by polymerising vinyl cyanide.
all (a), (b) and (c).

Q.30.

Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an

rigid foam
engineering plastic
thermosetting polymer
spongy rubber

Q.31.

Diphenylamine is added to rubber to

valcanise it.
protect it from deterioration on exposure to air.
make it non-inflammable.
make it thermosetting.

Q.32.

Which of the following is not a thermoplastic material ?

Epoxy polymer
PVC
Polystyrene
Polythene

Q.33.

Vulcanisation of raw rubber makes it

soft
less elastic
plastic
tacky

Q.34.

Nitrile rubber is produced by the polymerisation of

acrylonitrile & butadiene.
acrylonitrile & styrene.
isobutylene & isoprene.
none of these.

Q.35.

Starting material for the production of SBR is

ethyl alcohol
ethylene
both (a) & (b)
neither (a) nor (b)

Q.36.

Lavatory cisterns are normally made of

expanded polystyrene
saturated polyester
perspex
PVC

Q.37.

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.38.

Celluloid is

cellulose acetate
regenerated cellulose
cellulose nitrate
cellulose acetate butyrate

Q.39.

The synthetic fibres produced from __________ are known as rayon.

lignin
cellulose
polyamides
ethylene glycol

Q.40.

Which of the following is a copolymer ?

PVC
Bakelite
Polythene
Teflon

Q.41.

Orlan fibre which is used as a wool sub stitute is

an amorphous polymer.
a natural polymeric fibre.
polyacrylonitrile.
polymethylmethacrylate (PMMA).

Q.42.

Plasticisers are added to synthetic plastics to

impart flexibility.
improve workability during fabrication.
develop new improved properties not present in the original resin.
all (a), (b) and (c).

Q.43.

Which of the following low molecular weight (<10⁴ ), soft & waxy polymer is used in chewing gum ?

Cellulose acetate
Polyvinyl acetate
Thiokol
PVC

Q.44.

The main use of butadiene is

as a plasticiser for unsaturated polyester.
in the manufacture of synthetic rubber.
as an anti-skimming agent in paint.
none of these.

Q.45.

Automobile steering wheels are normally made of

cellulose acetate
cellulose nitrate
PVC
high density polythene

Q.46.

Styrene butadiene rubber (SBR) as compared to natural rubber has

poor tensile strength.
poorer resistance.
greater amount of heat build up heavy loading.
all (a), (b) ana (c).

Q.47.

Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to

protect rubber goods from attack by oxygen & ozone present in the atmosphere.
reduce its viscosity to permit easier processing.
reduce the time of vulcanisation and quantity of vulcanising agent.
increase its viscosity.

Q.48.

Density of high density polythene is about __________ gm/c.c.

1.18
1.05
0.95
0.99

Q.49.

Nylon-6 is manufactured from

caprolactum.
adipic acid and hexamethylene diamine.
maleic anhydride and hexamethylene diamine.
sebasic acid and hexamethylene diamine.

Q.50.

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

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