Semiconductor Devices Test

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Semiconductor Devices Test - 47

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Weekly Quiz Competition

Question 1
4 / -1

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that

A
P and Q are conductors of different materials

B
P is N-type semiconductor and Q is P-type semiconductor

C
P is semiconductor and Q is conductor

D
P is conductor and Q is semiconductor

Solution
Question 2
4 / -1

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

A
E_c and E_v, increase, but E_g decrease

B
E_c and E_v decrease, but E_g increase

C
All E_c, E_g, E_v decrease

D
All E_c, E_g, E_v increase
Question 3
4 / -1

In extrinsic P and N-type semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about

A
1

B
10^–1

C
10^–4

D
10^–7
Question 4
4 / -1

A hole in a P-type semiconductor is

A
An excess electron

B
A missing electron

C
A missing atom

D
A donor level
Question 5
4 / -1

In P-type semiconductor the majority and minority charge carriers are respectively

A
Protons and electrons

B
Electrons and protons

C
Electrons and holes

D
Holes and electrons
Question 6
4 / -1

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

A
The number of free conduction electrons is significant in C but small in Si and Ge

B
The number of free conduction electrons is negligible small in all the three

C
The number of free electrons for conduction is significant in all the three

D
The number of free electrons for conduction is significant only in Si and Ge but small in C
Question 7
4 / -1

Electronic configuration of germanium is 2, 8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added

A
The material obtained will be N-type germanium in which electrons and holes are equal in number

B
The material obtained will be P-type germanium

C
The material obtained will be N-type germanium which has more electrons than holes at room temperature

D
The material obtained will be N-type germanium which has less electrons than holes at room temperature
Question 8
4 / -1

A semiconductor is cooled from T₁K to T₂K. Its resistance

A
Will decrease

B
Will increase

C
Will first decrease and increase

D
Will not change

Solution
Question 9
4 / -1

If N_p and N_e be the numbers of holes and conduction electrons in an extrinsic semiconductor, then

A
N_p > N_e

B
N_p = N_e

C
N_p < N_e

D
N_p > N_e or N_p < N_e depending on the nature of impurity
Question 10
4 / -1

The energy gap between conduction band and the valence band is of the order of 0.7eV. Then, it is

A
An insulator

B
A conductor

C
A semiconductor

D
An alloy

Solution

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Semiconductor Devices Test - 47

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Semiconductor Devices Test - 47

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Question 1

P and Q are conductors of different materials

P is N-type semiconductor and Q is P-type semiconductor

P is semiconductor and Q is conductor

P is conductor and Q is semiconductor

Solution

Question 2

Ec and Ev, increase, but Eg decrease

Ec and Ev decrease, but Eg increase

All Ec, Eg, Ev decrease

All Ec, Eg, Ev increase

Question 3

1

10–1

10–4

10–7

Question 4

An excess electron

A missing electron

A missing atom

A donor level

Question 5

Protons and electrons

Electrons and protons

Electrons and holes

Holes and electrons

Question 6

The number of free conduction electrons is significant in C but small in Si and Ge

The number of free conduction electrons is negligible small in all the three

The number of free electrons for conduction is significant in all the three

The number of free electrons for conduction is significant only in Si and Ge but small in C

Question 7

The material obtained will be N-type germanium in which electrons and holes are equal in number

The material obtained will be P-type germanium

The material obtained will be N-type germanium which has more electrons than holes at room temperature

The material obtained will be N-type germanium which has less electrons than holes at room temperature

Question 8

Will decrease

Will increase

Will first decrease and increase

Will not change

Solution

Question 9

Np > Ne

Np = Ne

Np < Ne

Np > Ne or Np < Ne depending on the nature of impurity

Question 10

An insulator

A conductor

A semiconductor

An alloy

Solution

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E_c and E_v, increase, but E_g decrease

E_c and E_v decrease, but E_g increase

All E_c, E_g, E_v decrease

All E_c, E_g, E_v increase

10^–1

10^–4

10^–7

N_p > N_e

N_p = N_e

N_p < N_e

N_p > N_e or N_p < N_e depending on the nature of impurity