GATE XE topic:polymer-characterization PYQs & Answers — Page 2

Questions 11–20 of 26. Imported answers require independent review unless marked reviewed.

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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In a rubber sample with a Mooney viscosity of 60 ML(1+4) 100 °C, the number 4 signifies

Your answerChoose one option.

Applied shear rate in s⁻¹

Number of samples tested

Time in minutes after starting the motor when the measurement is taken

Preheating time in minutes

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If 5 g of a monodisperse polystyrene sample of molecular weight 10,000 g mol

is mixed with 15 g of another monodisperse polystyrene sample of molecular weight 20,000 g mol

, then the polydispersity of the resulting mixture is ________ (rounded off to two decimal places).

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Compression moulded isotropic polypropylene film exhibits __________ in X-ray diffraction analysis.

Your answerChoose one option.

spot pattern

circular ring pattern

circular ring and spot pattern

arc pattern

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The size of a coiled polymer chain in a dilute solution is

in a good solvent,

in an ideal solvent and

in a poor solvent. Select the correct ordering of sizes.

Your answerChoose one option.

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A sample of an oriented semi-crystalline polymer is subjected to uniaxial tensile stress,

, in an X-ray diffractometer. The wavelength of X-ray radiation (Cu K

) is

= 1.542 Å. The position of the (002) peak, which was found initially at a Bragg angle of 37.50° at

= 0 MPa shifted to 37.45° at

= 160 MPa. Assuming elastic deformation, the strain (rounded off to three decimal places) in the sample along the direction of applied stress is ______ × 10⁻³.

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Match the appropriate characterization technique in Column A used to determine the polymer attributes in Column B

Column A: P Gel permeation chromatography; Q FT-IR spectroscopy; R Differential scanning calorimetry; S X-ray diffraction.

Column B: 1 Functional group; 2 Crystal structure; 3 Glass transition temperature; 4 Molecular weight

Your answerChoose one option.

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

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

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

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

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Viscosity measurements were performed for a set of PMMA solutions of different concentrations in toluene at 25 °C. The plot of reduced viscosity against concentration (c) of the PMMA solutions produced an intercept of 21.0 cm³ g⁻¹ on the ordinate at c = 0. The value of viscosity average molecular weight of PMMA in toluene at 25 °C is ______ (round off to nearest integer). [Given: Mark-Houwink constants K = 7.5×10⁻³ cm³ g⁻¹ and a = 0.72 for PMMA in toluene at 25 °C]

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Match the following polymers with their characteristic infrared (IR) stretching frequency:

Polymer P. Polystyrene Q. Polyacrylonitrile R. Poly(ethylene terephthalate) S. Poly(vinyl alcohol)

IR stretching frequency (cm⁻¹)

~2242

~1733

~3392

~3100

Your answerChoose one option.

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

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

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

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

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A polypropylene (PP) bar with a 10 mm × 10 mm square section is 225 mm long. The modulus of PP bar is 861 MN m⁻². It is pinned at both ends and an axial compressive load of 140 N is applied. The strain due to the applied load experienced by the PP bar is ____ % (round off to two decimal places).

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GATE XE topic:polymer-characterization PYQs

Question 131

Question 111

Question 126

Question 4

Question 9

Question 22

Question 12

Question 17

Question 11

Question 17