Material Science And Metallurgy (3131904) MCQs

MCQs of Crystal Geometry and Crystal Imperfection

Showing 11 to 20 out of 60 Questions
1 2 3 4 5 6
11.

Which of the following is characteristic of non-crystalline structures?

(a)

Long range of periodicity
(b)

Well defined structure and geometry
(c)

Low density
(d)

Sharp diffraction pattern
Answer:

Option (c)

12.

Which of the following is a characteristic of crystalline structure?

(a)

High density
(b)

Low density
(c)

Range of melting point
(d)

Short range of order
Answer:

Option (a)

13.

The unit cells

(a)

contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
(b)

have the same orientation and their similar faces are parallel
(c)

may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice
(d)

all of the above
Answer:

Option (d)

14.

The crystal lattice has a _________ arrangement.

(a)

One-dimensional
(b)

Two-dimensional
(c)

Three-dimensional
(d)

Four-dimensional
Answer:

Option (c)

15.

Bravais lattice consists of __________ space lattices.

(a)

Eleven
(b)

Twelve
(c)

Thirteen
(d)

Fourteen
Answer:

Option (d)

16.

The material in which the atoms are arranged regularly in some directions but not in others, is called

(a)

amorphous material
(b)

mesomorphous material
(c)

crystalline material
(d)

none of these
Answer:

Option (b)

17.

Which of the following is not an amorphous material?

(a)

Glass
(b)

Plastics
(c)

Lead
(d)

polymers
Answer:

Option (c)

18.

A material is said to be allotropic, if it has

(a)

fixed structure at all temperatures
(b)

atoms distributed in random pattern
(c)

different crystal structures at different temperatures
(d)

any one of the above
Answer:

Option (c)

19.

Amorphous solids have _______ structure

(a)

Regular
(b)

Linear
(c)

Irregular
(d)

Dendritic
Answer:

Option (c)

20.

The material in which the atoms are arranged chaotically, is called

(a)

amorphous material
(b)

mesomorphous material
(c)

crystalline material
(d)

none of these
Answer:

Option (a)

Showing 11 to 20 out of 60 Questions
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