__________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR.

Consider the following statements about emulsion SBR and solution SBR. I. Solution SBR has higher content of non-rubber materials than emulsion SBR II. Solution SBR has higher molecular weight but broader molecular weight distribution than emulsion SBR III. Solution SBR has higher cis-1,4-polybutadiene content than emulsion SBR Which of the following statements are true?

A

I, II, III

B

I, II

C

III only

D

I only

SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at

A

1:3

B

3:1

C

1:2

D

2:1

SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at

A

1:3

B

3:1

C

1:2

D

2:1

The acidification of oceans is increasing. Why is this phenomenon a cause of concern? 1. The growth and survival of calcareous phytoplankton will be adversely affected. 2. The growth and survival of coral reefs will be adversely affected. 3. The survival of some animals that have phytoplanktonic larvae will be adversely affected. 4. The cloud seeding and formation of clouds will be adversely affected. Which of the statements given above is/are correct?

A

1, 2 and 3 only

B

2 only

C

1 and 3 only

D

1, 2, 3 and 4

Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an

A

Rigid foam

B

Engineering plastic

C

Thermosetting polymer

D

Spongy rubber

With respect to the term Copolymerisation, find the correct statement? same monomeric species are used to make the copolymer more than one monomeric species are used to make the copolymer The copolymer of butadiene – styrene is used for the manufacturing of automobile tyres. They have the same property as of homopolymers

A

Statement I and III only

B

Statement II and III only

C

Statement I, II and IV only

D

Statement III and IV only

Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are

A

5°C and 1 kgf/cm²

B

-20°C and 1 kgf/cm²

C

0°C and 1 kgf/cm²

D

0°C and 3 kgf/cm²

In a village 50% of the villagers produce rice, 40% of the villagers produce apples and 50% of the villagers produce vegetables, 20% of the villagers produce rice and apples both, 25% of the villagers produce apples and vegetables both, 20% of the villagers produce rice and vegetables both and 10% of the villagers produce all three. Find the percentage of villagers who do not produce anything.

A

12%

B

15%

C

13%

D

14%

Styrene-butadiene-rubber (SBR) as compared to natural rubber has

A

Poorer tensile strength

B

Poorer resistance to oxidation

C

Greater amount of heat build-up under heavy loading

D

All of the above

Styrene butadiene rubber (SBR) is never used for making

A

Coated fabrics

B

Front wheel tyres of aeroplanes (i.e., heavy duty tyres)

C

Gaskets

D

Soles of shoes

__________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR.

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