4971. Styrene butadiene rubber is commercially manufactured by
bulk polymerisation
suspension polymerisation
solution polymerisation
emulsion polymerisation
✅ The correct answer is option D.
Chemical Engineering
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4972. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of
cold SBR
butyl rubber
Bunai N
Buna S
✅ The correct answer is option B.
4973. In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is
terylene
polybutadiene
PVC
polypropylene
✅ The correct answer is option A.
4974. Paper like thin plastic articles can be produced by
blow moulding
vacuum thermo forming
injection moulding
none of these
✅ The correct answer is option B.
4975. Polystyrene is a light, transparent, thermoplastic material used for making
toys and combs
packaging bags
non-sticking utensils
electrical insulation
✅ The correct answer is option A.
4976. Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically
polymethyl methacrylate (PMMA).
Polytetraflouroethylene(PTFE).
polycarbonates.
phenolic resins.
✅ The correct answer is option A.
4977. Thermosplastic materials
do not soften on application of heat.
are heavily branched molecules.
are solvent insoluble.
none of these.
✅ The correct answer is option D.
4978. Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.
-20 to 25
50 to 75
100 to 150
250-280
✅ The correct answer is option D.
4979. Hydrochloric acid is also known as
Oil of vitriol
Muriatic acid
Strong organic acid
Green acid
✅ The correct answer is option B.
4980. Sulphuric acid completely saturated with sulphur trioxide is called
Concentrated sulphuric acid
Oleum
Sulphurous acid
Dilute sulphuric acid
✅ The correct answer is option A.