GATE XE topic:engineering PYQs & Answers — Page 164

Questions 1631–1640 of 1772. Imported answers require independent review unless marked reviewed.

Topic practice 1772 questionsPage 164 of 178

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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The unit cell volume of polyethylene (PE) is 0.093 nm

. Assuming two ethylene repeat units are contained within each unit cell, the density of a totally crystalline PE will be .............. g/cm

(Take the atomic weights for carbon and hydrogen as 12.01 g/mol and 1.008 g/mol, respectively, and the Avogadro’s number as

repeat units/mol)

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GATE XE topic:engineering PYQs

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40

Question 41

Question 42

Question 43