Chemical Engineering - Polymer Technology

31. 

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

A. densities
B. melting point
C. tensile strength
D. hardness, rigidity & brittleness

Answer: Option D

Explanation:

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32. 

Vulcanisation of rubber does not increase its

A. softness
B. oxidation resistance
C. weight & strength
D. elasticity & water solubility

Answer: Option A

Explanation:

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33. 

Which of the following is a copolymer ?

A. Polystyrene
B. SBR
C. P.T.F.E.
D. Polypropylene

Answer: Option B

Explanation:

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34. 

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

Answer: Option B

Explanation:

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35. 

Cross linked polymers are

A. thermoplastic
B. thermosetting
C. either (a) or (b)
D. fibres only

Answer: Option B

Explanation:

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