Which of the following oxides shows electrical properties like metals?

1

(a)

SiO₂

(b)

MgO

(c)

SO₂ (s)

(d)

CrO₂

In which pair most efficient packing packing is present?

1

(a)

hcp and bcc

(b)

hcp and ccp

(c)

bcc and ccp

(d)

bcc and simple cubic cell

What is the coordination number in a square close packed structure in two dimensions?

1

(a)

2

(b)

3

(c)

4

(d)

6

A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because........................ . 

1

(a)

all the domains get oriented in the direction of magnetic field.

(b)

all the domains get oriented in the direction opposite to the direction of magnetic field.

(c)

domains get oriented randomly

(d)

domains are not affected by magnetic field.

Which of the following statements are true about metals?

1

(a)

Valence band overlaps with condition band.

(b)

The gap between valence band and condition band is negligible.

(c)

The gap between valence band and condition band cannot be determined.

(d)

The gap between valence band and condition band cannot be determined.