Solid State Test

Question 1
1 / -0

Which of the following is true about the charge acquired by p-type semiconductors?

A
Positive

B
Neutral

C
Negative

D
Depends on concentration of p impurity

Question 2
1 / -0

To get a n-type semiconductor from silicon, it should be doped with a substance with valence ................

A
2

B
1

C
3

D
5

Question 3
1 / -0

The total number of tetrahedral voids in the face centred unit cell is .................

A
6

B
8

C
10

D
12

Question 4
1 / -0

Which of the following point defects are shown by AgBr(s) crystals?

(A) Schottky defect

(B) Frenkel defect

(C) Metal excess defect

(D) Metal deficiency defect

A
(A) and (B)

B
(C) and (D)

C
(A) and (C)

D
(B) and (D)

Question 5
1 / -0

In which pair most efficient packing is present?

A
hcp and bcc

B
hcp and ccp

C
bcc and ccp

D
bcc and simple cubic cell

Question 6
1 / -0

The percentage of empty space in a body centred cubic arrangement is ...............

A
74

B
68

C
32

D
26

Question 7
1 / -0

Which of the following statement is not true about the hexagonal close packing?

A
The coordination number is 12.

B
It has 74% packing efficiency

C
Tetrahedral voids of the second layer are covered by the spheres of the third layer.

D
In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.

Question 8
1 / -0

Which of the following statements are true about semiconductors?

(i) Silicon doped with electron rich impurity is a p-type semiconductor.

(ii) Silicon doped with an electron rich impurity is an n-type semiconductor.

(iii) Delocalised electrons increase the conductivity of doped silicon.

(iv) An electron vacancy increases the conductivity of n-type semiconductor.

A
(ii) and (iii)

B
(i) and (ii)

C
(i) and (iv)

D
(iv) and (iii)

Question 9
1 / -0

An excess of potassium ions makes KCl crystals appear violet or lilac in colour since .....

(i) some of the anionic sites are occupied by an unpaired electron.

(ii) some of the anionic sites are occupied by a pair of electrons

(iii) there are vacancies at some anionic sites.

(iv) F-centres are created which impart colour to the crystals.

A
(i), (iv)

B
(i), (ii)

C
(iii), (iv)

D
(ii), (iv)

Question 10
1 / -0

The number of tetrahedral voids per unit cell in NaCl crystal is ........

(i) 4

(ii) 8

(iii) twice the number of octahedral voids.

(iv) four times the number of octahedral voids.

A
(ii) and (iii)

B
(i) and (ii)

C
(iv) and (i)

D
(i) and (iii)

Submit Test

Solid State Tes...

Question 1

Positive

Neutral

Negative

Depends on concentration of p impurity

Question 2

2

1

3

5

Question 3

6

8

10

12

Question 4

(A) and (B)

(C) and (D)

(A) and (C)

(B) and (D)

Question 5

hcp and bcc

hcp and ccp

bcc and ccp

bcc and simple cubic cell

Question 6

74

68

32

26

Question 7

The coordination number is 12.

It has 74% packing efficiency

Tetrahedral voids of the second layer are covered by the spheres of the third layer.

In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.

Question 8

(ii) and (iii)

(i) and (ii)

(i) and (iv)

(iv) and (iii)

Question 9

(i), (iv)

(i), (ii)

(iii), (iv)

(ii), (iv)

Question 10

(ii) and (iii)

(i) and (ii)

(iv) and (i)

(i) and (iii)

User

Question Analysis

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