151. A copolymer of vinyl and vinylidine chloride is called
treylene
orlon
saran
dacron
✅ The correct answer is option C.
Polymer Technology MCQs
152. In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher
densities
melting point
tensile strength
hardness, rigidity & brittleness
✅ The correct answer is option D.
153. __________ is normally used for the manufacture of refrigerator components and transistor parts.
Polyproylene
Polystyrene
Polyester
Polyurathene
✅ The correct answer is option B.
154. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at
1:03
3:01
1:02
2:01
✅ The correct answer is option A.
155. Dacron (or terylene) fibres as compared to nylon fibres have
better heat & acid resistant properties.
poorer resistance to alkalis.
poorer dyeability.
all (a), (b) and (c).
✅ The correct answer is option D.
156. Vulcanisation of rubber
decreases its tensile strength.
increases its ozone & oxygen reactivity.
increases its oil & solvent resistance.
converts its plasticity into elasticity.
✅ The correct answer is option D.
157. Plastic tubes & pipes are generally made by __________ moulding.
injection
transfer
extrusion
compression
✅ The correct answer is option C.
158. Thermosetting resins/polymers as compared to thermoplastic ones are
soluble in all organic solvents.
more brittle.
formed by addition polymerisation only.
easily reshaped & reused.
✅ The correct answer is option B.
159. 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.
✅ The correct answer is option A.
160. Ebonite is a/an
highly vulcanised rubber.
natural rubber.
unvulcanised raw rubber.
adhesive.
✅ The correct answer is option A.