Engineering Sciences
GATE XE purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 671–680 of 1772. Imported answers require independent review unless marked reviewed.
Question 124
Open questionXE-FMSQ2 marksNeeds review
Stress versus elongation profiles for different polymeric materials are shown in the figure. Chose the combination that best describes these profiles.
Your answerSelect all correct options. You can choose more than one.
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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 126
Open questionXE-FNAT2 marksNeeds review
A nylon sample of 0.03 m² cross-sectional area is subjected to a creep load of 10 kN. The load is removed after a duration of 6 s. Young’s modulus and the viscosity for nylon are 1 GPa and 300 Giga Poise. The compliance of the specimen is ________×10⁻⁹ m²/N. (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 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 128
Open questionXE-FNAT2 marksNeeds review
A polymeric material of density 0.9 g/cc and melt volume of 10 cc in an extruder has a residence time of 100 s. The output of the extruder is _____ kg/h. (Rounded off to two decimal places)
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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 129
Open questionXE-FNAT2 marksNeeds review
A polymer weighing 0.2 g is dissolved in 100 ml of benzene and has a relative viscosity of 1.5. The polymer obeys Mark-Houwink equation with constants a = 0.5 and K = 0.001. The molecular weight of the polymer is _____ ×10¹⁰ g/mol. (Rounded off to two decimal places)
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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 130
Open questionXE-FNAT2 marksNeeds review
A continuous and aligned glass-fiber reinforced composite consists of 40 vol% of glass-fiber having a modulus of elasticity of 69 GPa and 60 vol% of a polyester resin, which when hardened, displays a modulus of 3.4 GPa. The modulus of elasticity of this composite in the longitudinal direction is__________GPa. (Rounded off to two decimal places)
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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 131
Open questionXE-FNAT2 marksNeeds review
The molar mass distribution of a polymer is
Number of molecules | Molar mass (g/mol) |
|---|---|
100 | 750 |
50 | 500 |
The resulting weight average molecular weight of the polymer is ______ g/mol. (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 132
Open questionXE-GMCQ1 markNeeds review
Choose the correct group of fat soluble vitamins
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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 133
Open questionXE-GMCQ1 markNeeds review
The synthesis of thyroxine T4 in human body requires
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