Semiconductor Devices Test

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Semiconductor Devices Test - 51

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Weekly Quiz Competition

Question 1
4 / -1

Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be

A
Positively charged

B
Negatively charged

C
Positively charged or negatively charged depending upon the type of impurity that has been added

D
Electrically neutral
Question 2
4 / -1

If n_e and v_d be the number of electrons and drift velocity in a semiconductor. When the temperature is increased

A
n_e increases and v_d decreases

B
n_e decreases and v_d increases

C
Both n_e and v_d increases

D
Both n_e and v_d decreases

Solution
Question 3
4 / -1

In extrinsic semiconductors

A
The conduction band and valence band overlap

B
The gap between conduction band and valence band is more than 16 eV

C
The gap between conduction band and valence band is near about 1eV

D
The gap between conduction band and valence band will be 100 eV and more
Question 4
4 / -1

Based on the energy band description, a solid can be classified as a semiconductor if the energy gap between the valence band and conduction band is

A
3eV < E_g < 6 eV

B
E_g > 6 eV

C
E_g < 3eV

D
E_g = 0 eV
Question 5
4 / -1

The forbidden energy gap in Ge is 0.72 eV. Given, hc = 12400 eV–Å. The maximum wavelength of radiation that will generate electron hole pairs is

A
172220 Å

B
172.2 Å

C
17222 Å

D
1722 Å

Solution
Question 6
4 / -1

Intrinsic germanium and silicon at absolute zero temperature behave like

A
Superconductor

B
Good semiconductor

C
Ideal insulator

D
Conductor
Question 7
4 / -1

Solids having highest energy level partially filled with electrons are

A
Semiconductor

B
Conductor

C
Insulator

D
None of these
Question 8
4 / -1

In a PN-junction diode

A
The current in the reverse biased condition is generally very small

B
The current in the reverse biased condition is small but the forward biased current is independent of the bias voltage

C
The reverse biased current is strongly dependent on the applied bias voltage

D
The forward biased current is very small in comparison to reverse biased current
Question 9
4 / -1

The electrical circuit used to get smooth DC output from a rectifier circuit is called

A
Oscillator

B
Filter

C
Amplifier

D
Logic gates
Question 10
4 / -1

What is the current through an ideal PN-junction diode show in figure below?

A
Zero

B
10 mA

C
20 mA

D
50 mA

Solution

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Re-Attempt Weekly Quiz Competition

Semiconductor Devices Test - 51

Result

Semiconductor Devices Test - 51

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SHARING IS CARING

Question 1

Positively charged

Negatively charged

Positively charged or negatively charged depending upon the type of impurity that has been added

Electrically neutral

Question 2

ne increases and vd decreases

ne decreases and vd increases

Both ne and vd increases

Both ne and vd decreases

Solution

Question 3

The conduction band and valence band overlap

The gap between conduction band and valence band is more than 16 eV

The gap between conduction band and valence band is near about 1eV

The gap between conduction band and valence band will be 100 eV and more

Question 4

3eV < Eg < 6 eV

Eg > 6 eV

Eg < 3eV

Eg = 0 eV

Question 5

172220 Å

172.2 Å

17222 Å

1722 Å

Solution

Question 6

Superconductor

Good semiconductor

Ideal insulator

Conductor

Question 7

Semiconductor

Conductor

Insulator

None of these

Question 8

The current in the reverse biased condition is generally very small

The current in the reverse biased condition is small but the forward biased current is independent of the bias voltage

The reverse biased current is strongly dependent on the applied bias voltage

The forward biased current is very small in comparison to reverse biased current

Question 9

Oscillator

Filter

Amplifier

Logic gates

Question 10

Zero

10 mA

20 mA

50 mA

Solution

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Question Analysis

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n_e increases and v_d decreases

n_e decreases and v_d increases

Both n_e and v_d increases

Both n_e and v_d decreases

3eV < E_g < 6 eV

E_g > 6 eV

E_g < 3eV

E_g = 0 eV