Material Science And Metallurgy (3131904) MCQs

MCQs of Crystal Geometry and Crystal Imperfection

Showing 1 to 10 out of 60 Questions
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1.

Numbers of atom in F.F.C. space lattice is

(a)

2
(b)

4
(c)

6
(d)

8
Answer:

Option (b)

2.

The bond formed by transferring electrons from one atom to another is called

(a)

ionic bond
(b)

covalent bond
(c)

metallic bond
(d)

none of these
Answer:

Option (a)

3.

There are fourteen atoms in a unit cell of

(a)

BCC
(b)

FCC
(c)

HCP
(d)

none of these
Answer:

Option (b)

4.

The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

(a)

coordination number
(b)

atomic packing factor
(c)

space lattice
(d)

none of these
Answer:

Option (b)

5.

According to Hume Rothery’s rules, size of atoms must not differ by more than ________

(a)

5%
(b)

15%
(c)

35%
(d)

55%
Answer:

Option (b)

6.

Body centred cubic space lattice is found in

(a)

zinc, magnesinm, 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 (c)

7.

The atomic packing factor in a simple cubic unit cell is _______

(a)

0.74
(b)

0.52
(c)

0.68
(d)

0.66
Answer:

Option (b)

8.

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

(a)

4
(b)

6
(c)

8
(d)

2
Answer:

Option (b)

9.

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)

10.

The molecules in a solid move

(a)

 In a random manner
(b)

In a haphazard way
(c)

In circular motion
(d)

Back and forth like tiny pendulums
Answer:

Option (d)

Showing 1 to 10 out of 60 Questions
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