In vulcanisation of rubber:

(1) Sulphur reacts to form new compound.

(2) Sulphur cross-links are introduced which resists wear and tear due to friction.

(3) Sulphur forms a very thin protective layer over rubber.

(4) All of the above.

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 55%
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The starting materials of PCTFE are:

(1) monochloro trifluoro ethylene

(2) tetrafluoroethylene

(3) vinyl chloride

(4) styrene

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
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The abbreviation PDI refers to:

(1) name of the polymer

(2) polydispersity index of polymer

(3) application of polymer

(4) poly diagonal index

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 78%
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Caprolactam can be obtained from:

(1) benzaldehyde

(2) cyclohexane

(3) benzophenone

(4) adipic acid

Subtopic:  Polymers: Natural & Synthetic, Biodegradable & Non Biodegradable |
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The monomer units of silicons a water repellant, acid resistant and heat resistant polymer is:

1. Si                         

2. SiO2

3. R2SiO                   

4. None of these

Subtopic:  Polymers: Natural & Synthetic, Biodegradable & Non Biodegradable |
 67%
From NCERT
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A polymer of acrylonitrile is called:

1. Saran

2. Orlon

3. Dacron

4. Tetron

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 74%
From NCERT
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Which one of the following pairs is not correctly matched?

1. Terylene—condensation polymer of terephthalic acid and ethylene glycol

2. Teflon—thermally stable cross-linked polymer of phenol and formaldehyde

3. Perspex—a homopolymer of methyl methacrylate

4. Synthetic rubber —a copolymer of butadiene and styrene

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 79%
From NCERT
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Natural silk and artificial silk differ in one respect that one of them contains:

(1) N                     

(2) S

(3) P                       

(4) none of these

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
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Among the given options , the one that is not fibre is: 

1. Terylene.

2. Nylons.

3. Polyacrylonitrile.

4. Polychloroprene.

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 60%
From NCERT
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Which of the following cannot be grouped as polyolefins?

(1) Polystyrene                     

(2) Polypropene

(3) Polystyrene                     

(4) Polyoxyethene

Subtopic:  Classification - Methods of Polymerization & Copolymerization |
 60%
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