Solid State Quiz 3

Question 1

The packing fraction for a body centred cubic structure is

Accepted Answer

0.68

Answer

0.42

Answer

0.53

Answer

0.82

Question 2

If r is the radius of an atom and a is an edge length of fcc unit cell, then

Accepted Answer

$r = \frac{a}{2 \sqrt 2}$

Answer

$r = \frac{\sqrt 3}{4}a$

Answer

$r = \frac{a}{2}$

Answer

$r = 2 \sqrt 2a$

Question 3

The ratio of packing efficiency in scc, bcc and fcc crystalline structures is

Accepted Answer

1 : 1.3 : 1.4

Answer

1 : 1.2 : 1.3

Answer

1 : 1.12 : 1.23

Answer

1 : 1.25 : 1.38

Question 4

The correct sequence of the atomic layers in cubic close packing is

Accepted Answer

ABCABC

Answer

ABABA

Answer

ABACABAC

Answer

AABBAABB

Question 5

The major binding force in diamond is

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Metallic bond

Answer

Coordinate covalent bond

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