Polymer Technology

Question: A copolymer is formed by the combination of two or more monomer molecules
[A].

in a chain without the elimination of water.

[B].

with the elimination of small amount of water.

[C].

of the same monomer by elimination of small molecules of water.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Buna-S is also called
[A].

polyurathane

[B].

SBR

[C].

teflon

[D].

bakelite

Answer: Option B

Explanation:

No answer description available for this question.

Question: Ebonite is a/an
[A].

highly vulcanised rubber.

[B].

natural rubber.

[C].

unvulcanised raw rubber.

[D].

adhesive.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Condensation polymerisation of __________ produces bakelite.
[A].

propylene

[B].

phenol & formaldehyde

[C].

phenol & acetaldehyde

[D].

urea & formaldehyde

Answer: Option B

Explanation:

No answer description available for this question.

Question: Orlon is
[A].

a copolymer.

[B].

a condensation polymer.

[C].

obtained by polymerising vinyl cyanide.

[D].

all (a), (b) and (c).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its
[A].

elasticity

[B].

strength

[C].

plasticity

[D].

weathering characteristics

Answer: Option D

Explanation:

No answer description available for this question.

Question: Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.
[A].

organic peroxides

[B].

sulphuric acid

[C].

hydroflouric acid

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Contact lenses for eyes are made of perspex, which is nothing but
[A].

polymethylmethacrylate

[B].

polystyrene

[C].

unsaturated polyester

[D].

polypropylene

Answer: Option A

Explanation:

No answer description available for this question.

Question: Non sulphonated hard bakelites are not used for making
[A].

ion-exchange resins

[B].

fountain pen barrels

[C].

formica table tops

[D].

combs

Answer: Option A

Explanation:

No answer description available for this question.

Question: Bristles of tooth brushes are made of
[A].

nylon-6

[B].

nylon-66

[C].

polystyrene

[D].

PVC

Answer: Option B

Explanation:

No answer description available for this question.