Engineering Sciences
GATE XE topic:chemistry-high-polymers PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–30 of 66. Imported answers require independent review unless marked reviewed.
Question 116
Open questionXE-FMCQ1 markNeeds review
Among the options given, identify the correct match between the polymers and their glass transition temperatures (T_g).
Polymer: P — High density polyethylene; Q — Poly(vinyl carbazole); R — Polymethyl methacrylate; S — Polycarbonate.
Glass transition temperature (°C): 1 — >200; 2 — 145 to 155; 3 — -100 to -80; 4 — 90 to 100.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 117
Open questionXE-FMCQ1 markNeeds review
What is the correct order of decreasing crystallinity of the given polymers?
P — atactic-Polypropylene; Q — syndiotactic-Polystyrene; R — Nylon 6; S — Polyethylene terephthalate
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 118
Open questionXE-FMCQ1 markNeeds review
Choose the correct option that best correlates the graphs with the polymerization methods.
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Open questionXE-FMSQ2 marksNeeds review
Among the options given, identify the correct pair(s) of catalyst and co-catalyst that form a Ziegler-Natta catalyst.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 125
Open questionXE-FMSQ2 marksNeeds review
Among the options given, which method(s) is/are used for the synthesis of atactic polystyrene?
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 127
Open questionXE-FNAT2 marksNeeds review
Polyvinylidene fluoride (PVDF) was quenched from the melt in one case and in the other case, it was slowly cooled from the melt at 10 °C/min. The percentage crystallinity of the slowly cooled PVDF is 60%. The heat of fusion for the quenched PVDF is 0.5ΔH_m (ΔH_m is the heat of fusion for the slowly cooled PVDF), and the heat of fusion for 100% crystalline PVDF is 100 J/g. The percentage crystallinity of the quenched PVDF is ______ %. (Answer in integer)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 110
Open questionXE-FMCQ1 markNeeds review
Interfacial polymerization can be used to prepare
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Open questionXE-FMCQ1 markNeeds review
The initiator system which can be used for free radical polymerization at 5 °C is
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 118
Open questionXE-FNAT1 markNeeds review
The functionality of adipic acid for condensation reaction with glycerol is ________ (in integer).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 125
Open questionXE-FMCQ2 marksNeeds review
Match the polymers to the polymerization method used for their synthesis.
Polymer | Polymerization method |
|---|---|
P. Linear low density polyethylene | 1. Ring opening |
Q. Nylon 6 | 2. Ziegler-Natta |
R. Styrene-butadiene rubber | 3. Condensation |
S. Aromatic polyamide | 4. Emulsion |
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