GATE XE Polymer Technology PYQs & Answers

Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.

Questions 1–10 of 17. Imported answers require independent review unless marked reviewed.

Topic practice 17 questionsPage 1 of 2

Select the correct option to match the Compound/Additive to its most suitable Function from the table given below:

Your answerChoose one option.

P–IV ; Q–III ; R–II ; S–I

P–III ; Q–IV ; R–II ; S–I

P–I ; Q–III ; R–II ; S–IV

P–III ; Q–IV ; R–I ; S–II

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Which option(s) correctly match(es) the Class of additives used during polymer compounding with the corresponding Chemicals?

Class of additives: P — Antioxidant; Q — Flame retardant; R — Plasticizer; S — Colorant.

Chemicals: 1 — Phthalocyanine; 2 — Di(2-ethylhexyl) phthalate; 3 — Tricresyl phosphate; 4 — Phenyl β-naphthyl amine

Your answerSelect all correct options. You can choose more than one.

P-4; Q-3; R-2; S-1

P-4; Q-3; R-3; S-1

P-1; Q-2; R-4; S-2

P-2; Q-3; R-1; S-2

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A rubber contains 70 wt% butadiene (molar mass = 54 g/mol), 20 wt% isoprene (molar mass = 68 g/mol), 5 wt% sulfur and 5 wt% carbon black. Assume that all the sulfur is present in crosslinks.

If each sulfide crosslink contains an average of two sulfur atoms, the percentage of possible crosslinks that are joined by vulcanization is ________%. (Round off to one decimal place)

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Match the following additives to their respective functions for poly(vinyl chloride) compounding.

Additive	Function
P. Dibutyl tin maleate	1. Lubricant
Q. Epoxided soybean oil	2. Extender
R. Chlorinated paraffin wax	3. Heat stabilizer
S. Calcium stearate	4. Plasticizer

Your answerChoose one option.

P-3; Q-4; R-2; S-1

P-2; Q-4; R-1; S-3

P-3; Q-2; R-1; S-4

P-4; Q-2; R-1; S-3

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Among the options given, which agents are used to vulcanize or cure rubbers?

Your answerSelect all correct options. You can choose more than one.

Dicumyl peroxide

Zinc stearate

Carbon black

Dinitrobenzene

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Match the following additives to their respective functions

Additive: P. p-phenylenediamine Q. Trisyl phosphate R. Polybutadiene rubber S. Talc

Function:

Flame retardant

Impact modifier

Nucleating agent

Antioxidant

Your answerChoose one option.

P-4; Q-2; R-1; S-3

P-3; Q-1; R-2; S-4

P-4; Q-1; R-3; S-2

P-4; Q-1; R-2; S-3

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Match the Additive to its Function.

Additive	Function
P. Triotyl phosphate	1. Couping Agent
Q. Triethoxy vinyl silane	2. Antioxidant
R. Azoisobutyronitrile	3. Plasticizer
S. 4-Methyl-2,6-di-t-butyl phenol	4. Blowing Agent

Your answerChoose one option.

P-3, Q-2, R-1, S-4

P-3, Q-1, R-4, S-2

P-4, Q-1, R-3, S-2

P-1, Q-2, R-4, S-3

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A sample of natural rubber (cis-1,4-polyisoprene) is vulcanized such that one of every 240 chain carbon atoms is cross-linked. The formula unit of the isoprene monomer is C₅H₈ (molecular weight = 68 g/mol). The average molecular weight (rounded off to the nearest integer) between cross-links is ______ g/mol.

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Dicumyl peroxide is a

Your answerChoose one option.

Plasticizer

Cross-linking agent

Mold release agent

Peptizer

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Match each additive in Column A with its function given in Column B

Column A: P Azodiformamide; Q Di-octyl phthalate; R Benzoyl peroxide; S 2-(2′-hydroxy phenyl)benzotriazole.

Column B: 1 Curing agent; 2 UV stabilizer; 3 Blowing agent; 4 Plasticizer

Your answerChoose one option.

P-2, Q-3, R-1, S-2

P-3, Q-4, R-1, S-2

P-4, Q-3, R-2, S-1

P-1, Q-3, R-4, S-2

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GATE XE Polymer Technology PYQs

How to practice Polymer Technology

Question 122

Question 124

Question 131

Question 120

Question 120

Question 122

Question 10

Question 21

Question 8

Question 13