Material Science And Metallurgy (3131904) MCQs

MCQs of Crystal Geometry and Crystal Imperfection

Showing 21 to 30 out of 60 Questions
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21.

Which one of the following is most symmetrical?

(a)

Simple cubic cell
(b)

Hexagonal
(c)

Triclinic
(d)

Tetragonal
Answer:

Option (a)

22.

Closed packed hexagonal space lattice is found in

(a)

zinc, magnesium, cobalt, cadmium, antimony and bismuth
(b)

gamma-iron, aluminium, copper, lead, silver and nickel
(c)

alpha-iron, tungsten, chromium and molybdenum
(d)

none of the above
Answer:

Option (a)

23.

The type of space lattice found in gamma-iron is

(a)

face centred cubic space lattice
(b)

body centred cubic space lattice
(c)

close packed hexagonal space lattice
(d)

none of these
Answer:

Option (a)

24.

Which of the following iron exist between 910° C and 1403° C?

(a)

α-iron B
(b)

β-iron
(c)

γ-iron D
(d)

δ-iron
Answer:

Option (c)

25.

The type of space lattice found in alpha-iron is

(a)

face centred cubic space lattice
(b)

body centred cubic space lattice
(c)

close packed hexagonal space lattice
(d)

none of these
Answer:

Option (b)

26.

At ________ iron changes its BCC structure to FCC.

(a)

308  ̊C
(b)

568  ̊C
(c)

771  ̊C
(d)

906  ̊C
Answer:

Option (d)

27.

The coordination number of a face centred cubic space lattice is

(a)

six
(b)

twelve
(c)

eighteen
(d)

twenty
Answer:

Option (b)

28.

Specify the sequence correctly

(a)

Grain growth, recrystallisation, stress relief
(b)

Stress relief, grain growth, recrystallisation
(c)

Stress relief, recrystallisation, grain growth
(d)

Grain growth, stress relief, recrystallisation
Answer:

Option (c)

29.

Which of the following has a HCP crystal structure?

(a)

W
(b)

Mo
(c)

Cr
(d)

Zr
Answer:

Option (d)

30.

Lead is a metallic crystal having a _______ structure.

(a)

FCC
(b)

BCC
(c)

HCP
(d)

TCP
Answer:

Option (a)

Showing 21 to 30 out of 60 Questions
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