Online Test — Polymers
20 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 20
The small repeating unit of a polymer is the:
polymer
monomer
copolymer
macromolecule
Explanation: Monomers are the repeating units joined to form a polymer.
Question 2 of 20
Cellulose acetate is classified as a:
semi-synthetic polymer
natural polymer
synthetic polymer
elastomer
Explanation: It is chemically modified cellulose, hence semi-synthetic.
Question 3 of 20
Which polymer is cross-linked and thermosetting?
polythene
PVC
bakelite
nylon-6
Explanation: Bakelite is a heavily cross-linked thermoset.
Question 4 of 20
Nylon-6,6 is best classified by intermolecular forces as a:
fibre
elastomer
thermoplastic
gas
Explanation: Strong hydrogen bonding between amide groups makes nylon a fibre.
Question 5 of 20
Addition polymerisation requires monomers with:
-OH groups
-COOH groups
C=C double bonds
-NH2 groups
Explanation: Unsaturated monomers (C=C) undergo addition polymerisation.
Question 6 of 20
In free-radical polymerisation, peroxide homolysis to form radicals is the:
initiation step
propagation step
termination step
condensation step
Explanation: Radical generation that starts the chain is initiation.
Question 7 of 20
Which polymer forms by condensation with loss of water?
polythene
Teflon
terylene
PVC
Explanation: Terylene forms from ethylene glycol and terephthalic acid with elimination of water.
Question 8 of 20
Buna-N is a copolymer of 1,3-butadiene and:
styrene
isoprene
acrylonitrile
chloroprene
Explanation: Buna-N uses acrylonitrile; Buna-S uses styrene.
Question 9 of 20
The monomer of Teflon is:
vinyl chloride
acrylonitrile
ethene
tetrafluoroethene
Explanation: Teflon (PTFE) is the addition polymer of tetrafluoroethene.
Question 10 of 20
HDPE is prepared using a:
peroxide at high pressure
strong acid
Ziegler-Natta catalyst at low pressure
UV light only
Explanation: HDPE uses a Ziegler-Natta catalyst at low pressure, giving linear chains.
Question 11 of 20
Vulcanisation of rubber is carried out using:
nitrogen
sulphur
oxygen
chlorine
Explanation: Sulphur forms cross-links between rubber chains.
Question 12 of 20
Nylon-6 is made from the single monomer:
adipic acid
hexamethylenediamine
glycol
caprolactam
Explanation: Caprolactam ring-opens and polymerises to nylon-6.
Question 13 of 20
Which is a biodegradable polymer?
PVC
polythene
PHBV
Teflon
Explanation: PHBV is broken down by micro-organisms.
Question 14 of 20
Natural rubber is chemically:
cis-1,4-polyisoprene
trans-1,4-polyisoprene
polychloroprene
polybutadiene
Explanation: Natural rubber is cis-1,4-polyisoprene.
Question 15 of 20
LDPE differs from HDPE in being more:
branched
linear
cross-linked
crystalline
Explanation: LDPE has more branching, which lowers its density and stiffness.
Question 16 of 20
The linkage formed in nylon-6,6 is a(n):
ester linkage
ether linkage
amide linkage
glycosidic linkage
Explanation: A diamine and a diacid form amide (-CONH-) linkages.
Question 17 of 20
Which polymer is used as a wool substitute?
Teflon
polythene
polyacrylonitrile
bakelite
Explanation: Polyacrylonitrile (Orlon/Acrilan) replaces wool in sweaters and blankets.
Question 18 of 20
Neoprene is the polymer of:
isoprene
styrene
acrylonitrile
chloroprene
Explanation: Neoprene (polychloroprene) is made from chloroprene and resists oils.
Question 19 of 20
In step-growth polymerisation, high molecular mass forms:
immediately at the start
only near completion of the reaction
only at high temperature
never
Explanation: Oligomers combine gradually, so long chains appear only near completion.
Question 20 of 20
Melamine-formaldehyde resin is used to make:
non-stick coatings
car tyres
raincoats
unbreakable crockery
Explanation: Melamine resin gives hard, unbreakable crockery.