GATE XE topic:classification-structure-materials PYQs & Answers

Questions 1–10 of 40. Imported answers require independent review unless marked reviewed.

The interplanar spacing of

planes is 4.5 nm in a given crystal. For the

planes, the interplanar spacing, in nm, is ________ (rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The equilibrium vacancy concentration in aluminum at 900 K is

. The enthalpy of formation of vacancies, in kJ·mol

, is ________ (rounded off to one decimal place).

Given: Universal gas constant = 8.314 J·K

·mol

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a cubic crystal, the Burgers vector for a mixed dislocation line is

. The dislocation line lies along the [011] direction. The slip plane of the dislocation is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which one of the following statements regarding point defects in ionic solids is correct?

Your answerChoose one option.

Frenkel defects are dominant in those ionic solids where there is a considerable size difference between the cation and anion.

Schottky defects are dominant in those ionic solids where there is a considerable size difference between the cation and anion.

Schottky defects are the dominant defects in all ionic solids.

Similar density of both Frenkel and Schottky defects is present in all ionic solids.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider 3 crystals (all having FCC lattice) labeled as P, Q and R as described below:

Crystal P: Cu crystal with 4 Cu atoms per unit cell Crystal Q: NaCl crystal with 4 Na⁺ ions and 4 Cl⁻ ions per unit cell Crystal R: Diamond crystal with 8 C atoms per unit cell

Which of the following options is/are correct?

Your answerSelect all correct options. You can choose more than one.

Only crystal P is a close packed structure.

Only crystal Q is a close packed structure.

Crystal R has the smallest packing factor.

All the crystals P, Q and R are close packed structures.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The figure below shows a plane PQR in a unit cell. The Miller indices of the plane PQR is

Diagram for Engineering Sciences question 44

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

There is NO base-centered cubic lattice among the list of 14 Bravais lattices because of one or more of the following reasons

Your answerSelect all correct options. You can choose more than one.

It does NOT have translational symmetry

It is only compatible with the symmetry of orthorhombic crystal system

It is only compatible with the symmetry of tetragonal crystal system

It does NOT have 3-fold rotation axes along the body diagonals

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In an FCC crystal with lattice parameter a, consider the reaction of two leading partial dislocations, AB and CD, at the line of intersection of their slip planes (111) and (11̄1), respectively, as shown in the figure below. Dislocations, AB and CD, have Burgers vectors

and

, respectively, as given in the figure. Which one of the following options for the slip plane and the Burgers vector of the resulting dislocation is correct?

Diagram for Engineering Sciences question 53

Your answerChoose one option.

Slip plane is (001) and Burgers vector is

Slip plane is

and Burgers vector is

Slip plane is (001) and Burgers vector is

Slip plane is

and Burgers vector is

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A diffraction pattern is obtained from a powdered sample of a pure element, which has FCC crystal structure. If x and y are the Brag angles of the first and the third peaks, respectively, then the ratio,

, is (rounded off to one decimal place) ____________

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

For a pure element with a BCC crystal structure, the surface energies per unit area of and free surfaces are

and

, respectively. The ratio,

, is (rounded off to one decimal place) ____________

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XE topic:classification-structure-materials PYQs

How to practice topic:classification-structure-materials

Question 51

Question 52

Question 54

Question 57

Question 58

Question 44

Question 48

Question 53

Question 57

Question 58