Engineering Sciences
GATE XE year:2025 PYQs
Build your understanding with focused practice from past exam papers.
Questions 111–120 of 175. Imported answers require independent review unless marked reviewed.
Question 111
Open questionXE-FMCQ1 markNeeds review
Which one of the following permits the direct determination of intrinsic viscosity of a polymer solution for known molecular weight of the polymer?
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Open questionXE-FMCQ1 markNeeds review
Under which combination of conditions does the glass transition of a polymer increase?
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Open questionXE-FMCQ1 markNeeds review
In a polymer recycling plant, polymer “X” was depolymerized by glycolysis in the presence of ethylene glycol and a suitable catalyst. The glycolysis reaction yielded the following compound:
Identify the polymer “X” from the following options.
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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 114
Open questionXE-FMCQ1 markNeeds review
Polymer “Z” has a high melting point and it decomposes even before it melts. Hence, it is usually dissolved and subsequently regenerated. Rayon is one such regenerated form. Identify the polymer “Z” from the following options.
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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 115
Open questionXE-FMCQ1 markNeeds review
Match the Product with the most appropriate Processing Technique employed.
Product | Processing Technique |
|---|---|
P: Rainbows | 1: Blow molding |
Q: Disposable plastic cups | 2: Calendering |
R: Soft drink bottles | 3: Rotational molding |
S: Flexible films | 4: Thermoforming |
Choose the correct matching from the following options.
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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 116
Open questionXE-FMCQ1 markNeeds review
Crystallization is favored in polymer melts when the chain entanglement is ________________ and only polymers with ________________ molecular arrangement can crystallize.
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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
Match the Polymer with the most suitable Monomer combinations from which it is synthesized.
Polymer | Monomer combinations |
|---|---|
P: Polyurethane | 1: Maleic acid and propylene glycol |
Q: Epoxy | 2: Pyromellitic anhydride and p,p′-diaminodiphenyl ether |
R: Polyimide | 3: Epichlorohydrin and bisphenol A |
S: Polyester | 4: Hexamethylene diisocyanate and tetramethylene glycol |
Choose the correct matching from the following options.
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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
Thermoplastic Polyurethane and Polyamide 6 both contain amide linkages, but when compared to Polyurethane, Polyamide 6 shows higher melting point due to ________________.
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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 119
Open questionXE-FMCQ2 marksNeeds review
Injection molding is typically used to make plastic parts. If the pressure at the gate is monitored as a function of time during the injection of a thermoplastic polymer, identify the profile that best describes this event.
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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 120
Open questionXE-FMSQ2 marksNeeds review
The ‘unperturbed dimension’ of the polymer chain is represented as,
where,
= root-mean square end-to-end distance
= average length of a segment
= number of segments in the chain Using the above information, root-mean square end-to-end distance of a branched polyethene would be ________________ when compared with that of the linear polyethene of the same molecular weight and the same number of segments.Your answerSelect all correct options. You can choose more than one.
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