Crystallography MCQs : Here you will find MCQ Questions related to "Crystallography" in Manufacturing Engineering. These Crystallography MCQ Questions Will help you to improve your Manufacturing Engineering knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations

Question 1

Crystallography is the experimental science of determining the arrangement of _________ in crystalline solids

A. electron

B. proton

C. neutron

D. atoms

View Answer
**Ans **: D

**Explanation**: Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids.

Question 2

___________ is the branch of crystallography dealing specifically with the fundamental properties of symmetry and periodicity of crystals, topological properties of crystal structures.

A. Chemical crystallography

B. Mathematical crystallography

C. Physical crystallography

D. Biological crystallography

View Answer
**Ans **: B

**Explanation**: Mathematical crystallography is the branch of crystallography dealing specifically with the fundamental properties of symmetry and periodicity of crystals, topological properties of crystal structures, twins, modular and modulated structures, polytypes and OD structures.

Question 3

The lengths of the principal axes, or edges, of the unit cell and the angles between them are the lattice constants, also called ?

A. lattice parameters

B. cell parameters

C. Both A and B

D. length parameters

View Answer
**Ans **: C

**Explanation**: The lengths of the principal axes, or edges, of the unit cell and the angles between them are the lattice constants, also called lattice parameters or cell parameters.

Question 4

Coordinates in square brackets such as [100] denote a?

A. direction vector

B. plane of the crystal structure

C. family of planes and their normals

D. All of the above

View Answer
**Ans **: A

**Explanation**: Coordinates in square brackets such as [100] denote a direction vector (in real space).

Question 5

Which of the following has a non-crystalline structure?

A. Iron

B. Quartz

C. Silica glass

D. Tungsten

View Answer
**Ans **: C

**Explanation**: In general, metals exist in a crystalline form. Iron and Tungsten being metals takes up body centered cubic crystalline structure at room temperature. The ceramic compound–silica (SiO2), can exist either in a crystalline form or in a non-crystalline form (amorphous form). While quartz, tridymite and cristobalite are known as its crystalline forms which are being differentiated based on SiO4 tetrahedra linkage style, silica’s non-crystalline (amorphous) form is just called as the silica glass.

Question 6

Which of the following has less crystallinity?

A. Iron

B. Nickel

C. High density polythene

D. Low density polythene

View Answer
**Ans **: D

**Explanation**: It is clear that, iron and nickel being metals possesses a crystalline form, whereas high density polyethylene (HDPE) and low-density ethylene (LDPE) are a class of polymers. These both thermoplastics are semi-crystalline nature, out of which LDPE exhibits a crystallinity of about 50-60% and HDPE of about 90%. Some people may term HDPE as crystalline, but it is more appropriate to restrict it in the category of semi-crystalline class.

Question 7

What is the coordination number of a simple cubic (SC) unit cell?

A. 4

B. 6

C. 8

D. 10

View Answer
**Ans **: B

**Explanation**: There are six nearest neighbouring atoms for every atom in a simple cubic (SC) unit cell, in other words, every atom in a SC unit cell is surrounded by 6 other atoms, thus coordination number of SC unit cell is is 6.

Question 8

Miller indices form a notation system in crystallography for planes in crystal (Bravais) lattices

A. TRUE

B. FALSE

C. Can be true or false

D. Can not say

View Answer
**Ans **: A

**Explanation**: Miller indices form a notation system in crystallography for planes in crystal (Bravais) lattices. because the lattice vectors need not be mutually orthogonal). By convention, negative integers are written with a bar, as in 3 for −3.

Question 9

What is the coordination number of body centered cubic unit cell?

A. 2

B. 4

C. 6

D. 8

View Answer
**Ans **: D

**Explanation**: For any corner atom of the BCC unit cell, the nearest atoms are the body centred atoms. There are eight-unit cells in neighbours with body-centered atoms. Hence, the coordination number for a BCC cubic unit cell is 8.

Question 10

Indices in curly brackets or braces such as {100} denote a family of directions.

A. TRUE

B. FALSE

C. Can be true or false

D. Can not say

View Answer
**Ans **: B

**Explanation**: Indices in curly brackets or braces such as {100} denote a family of planes and their normals. In cubic materials the symmetry makes them equivalent, just as the way angle brackets denote a family of directions. In non-cubic materials, <hkl> is not necessarily perpendicular to {hkl}.