GATE XE Classification and Structure of Materials PYQs & Answers — Page 4

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Questions 31–40 of 40. Imported answers require independent review unless marked reviewed.

Topic practice 40 questionsPage 4 of 4

The potential energy, U(r), of a pair of atoms spaced at a distance r in a solid is given by

The equilibrium distance between the atom pair is _____ nm. (round off to 2 decimal places)

(Given: Constants A = 6 × 10⁻²⁰ J nm³, B = 2.1 × 10⁻²² J nm⁷)

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Minimum symmetry that a cubic crystal must possess is

Your answerChoose one option.

four 3-fold rotation axes.

three 4-fold rotation axes.

three orthogonal mirror planes.

centre of symmetry.

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Which one of the following is the characteristic of a screw dislocation?

Your answerChoose one option.

Dislocation line and Burgers vector are parallel.

Direction of motion of dislocation is parallel to the Burgers vector.

Atomic displacement due to the movement of the dislocation is in the direction of the motion of the dislocation line.

It has a unique slip plane.

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If the cation (C) to anion (A) radius ratio,

, is 0.6, then the coordination number (i.e., number of A ions surrounding a C ion) is likely to be __________.

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The planar atomic density in the (110) plane of a BCC iron crystal is __________ nm⁻² (give answer up to 2 decimal places)

(Given: lattice parameter of iron is 0.287 nm)

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

Your answerChoose one option.

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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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If the energy of formation of vacancies in pure copper is 0.9 eV, the fraction of vacancies in pure copper at 27 °C will be ..........

(Boltzmann’s constant is 8.62

eV/K)

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In an ionic solid the cation and the anion have ionic radii as 0.8 Å and 1.6 Å respectively. The maximum coordination number of the cation in the structure will be

Your answerChoose one option.

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GATE XE Classification and Structure of Materials PYQs

Question 15

Question 2

Question 5

Question 9

Question 21

Question 34

Question 41

Question 43

Question 50

Question 54