GATE XE format:mcq PYQs & Answers — Page 88

Questions 871–880 of 959. Imported answers require independent review unless marked reviewed.

Topic practice 959 questionsPage 88 of 96

Which of the following is a Frenkel defect?

Your answerChoose one option.

One Cl vacancy and one Na vacancy in NaCl

One Zn vacancy and one Zn interstitial in ZnO

K at the Na site in NaCl

None of the above

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Which processing technique is best suited for manufacturing decorative PVC floor tiles?

Your answerChoose one option.

Blow molding

Filament winding

Rotational molding

Calendering

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During deformation of a semi-crystalline polymer, with spherulitic morphology, stressed in tension, what happens to the amorphous and the crystalline regions at the later stages?

Your answerChoose one option.

Amorphous regions remain intact and only crystallites experience bending and stretching of chains

Only amorphous regions elongate in the stress direction and crystallites remain intact

Amorphous regions elongate in the stress direction and crystallites experience bending and stretching of chain

None of the above

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Which of the following statement(s) is / are true regarding the structure-property correlation in polymers? (i) Polymers that are less coiled are more crystalline than those that are more coiled (ii) Branched polymers are more crystalline than the linear ones (iii) Polymers with inter-chain interactions have higher glass transition temperature than those without inter-chain interactions (iv) Polymers with inter-chain interactions are more crystalline than those without inter-chain interactions

Your answerChoose one option.

(i) and (ii)

(i) and (iii)

(ii) and (iv)

(ii) and (iii)

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The contrast obtained in scanning electron microscope using back scattered electrons depends on

Your answerChoose one option.

Atomic number of the specimen material

Accelerating voltage of the microscope

Working distance in the microscope

Type of the electron emitter in the microscope

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Ceramic materials fail at stresses much lower than their theoretical strength due to

Your answerChoose one option.

Presence of dislocations

High elastic modulus

Presence of voids

Anisotropy in crystal structure

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The Miller indices of the first three Bragg peaks in the X-ray diffraction pattern obtained from a polycrystalline iron sample at room temperature are

Your answerChoose one option.

(111), (200), (220)

(100), (110), (111)

(100), (110), (200)

(110), (200), (220)

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The number of close packed planes in the lattice of an FCC metal is

Your answerChoose one option.

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Which of the following treatment(s) can increase the electrical conductivity of silicon

(i) Heating (ii) Doping with arsenic (iii) Doping with aluminium (iv) Exposure to light

Your answerChoose one option.

Only (i)

Only (i) and (ii)

Only (i), (ii) and (iv)

All (i), (ii), (iii) and (iv)

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Match the composites in Column I with the most suitable application in Column II

Column I (P) Exfoliated silicates filled butyl rubber (Q) Fiber reinforced aluminium alloy (R) Silicon carbide whiskers reinforced alumina (S) Carbon particles reinforced plastic composites

Column II (1) Automobile pistons (2) Contact lenses (3) Ski boards (4) Tennis balls (5) Cutting tool inserts for machining

Your answerChoose one option.

P-4; Q-1; R-5; S-3

P-2; Q-3; R-4; S-5

P-3; Q-5; R-5; S-3

P-2; Q-1; R-3; S-5

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GATE XE format:mcq PYQs

Question 34

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Question 45