191. Softening point of high density polythene is about __________ °C.
85
135
165
205
✅ The correct answer is option B.
Polymer Technology MCQs
192. 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)
✅ The correct answer is option D.
193. Amino resins are used in paper treatment to improve its
wet tear and bursting strength.
folding endurance
wet rub resistance
all (a), (b) & (c)
✅ The correct answer is option D.
195. Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.
nitrile
silicone
neoprene
butyl
✅ The correct answer is option D.
196. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
hexamethylene diamine and the ring.
hexamethylene diamine and the adipic acid.
adipic acid and the ring.
none of these.
✅ The correct answer is option B.
197. Polyvinyl chloride (PVC)
is produced by polycondensation reaction.
uses either emulsion or suspension polymerisation methods.
can be made thermosetting by adding a plasticiser.
softening temperature is 200°C.
✅ The correct answer is option B.
198. Addition polymerisation is not involved in the manufacture of
low density polythene.
poly vinyl chloride.
polystyrene.
polyhexamethylene adipamide.
✅ The correct answer is option D.
199. Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its
tensile strength
chemical resistance
flexibility
all (a), (b) & (c)
✅ The correct answer is option C.
200. __________ is a copolymer.
Nylon-66
Polyrophylene
PVC
Poly tetra flouro ethylene
✅ The correct answer is option A.