green sand
injection
shell
dry sand
✅ The correct answer is option B.
Polymer Technology MCQs
Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.
1-1000
1000-1500
1500-2000
2000-2500
✅ The correct answer is option A.
__________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR.
Percent elongation
Resilience
Freezing point
Strength
✅ The correct answer is option B.
A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture of
siloxane elastomers.
polyamides.
vinyl polymers.
urea-formaldehyde resins.
✅ The correct answer is option D.
Which of the following is the lowest cost plastic commercially available ?
Polythene
Teflon
Bakelite
PVC
✅ The correct answer is option A.
Hot drink (e.g, tea) cups are usually made of
polystyrene
polythene
polypropylene
PVC
✅ The correct answer is option A.
The repeating units of PTFE are
Cl2CH-CH3
F2 C = CF2
F3 C-CF3
FClC = CF2
✅ The correct answer is option B.
Polypropylene is preferred to polythene, because the former is
non-inflammable
harder
stronger
both(b) & (c)
✅ The correct answer is option D.
The synthetic fibres produced from __________ are known as rayon.
lignin
cellulose
polyamides
ethylene glycol
✅ The correct answer is option B.
__________ is not a polyester fibre.
Terylene
Dacron
Nylon
Polyacrylonitrite
✅ The correct answer is option C.