Semiconductor Electronics: Materials, Devices and Simple Circuits Test 12

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 12

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Question 1
1 / -0

Zener diode acts as a/an

A
oscillator

B
regulator

C
rectifier

D
fliter

Solution

Zener diode is used to supply constant voltage in voltage regulator circuit hence option (b) is correct.
Question 2
1 / -0

The vacancy created due to the absence of an electron in the valence band of a semiconductor is called a _________ .

A
electron

B
hole

C
proton

D
position

Solution

Whenever an electron jumps from a valence band to conduction band, an equal and opposite charge is left behind in the place of an electron. This is called a hole.
Question 3
1 / -0

The number $$0$$ (zero) is required for

A
transistor

B
abacus

C
computer

D
calculator

Solution

The number $$0$$ is most important in digital communication where only two states $$0,1$$ control the input and output and computer is based on digital signals.
Question 4
1 / -0

For germanium diode, the junction voltage is about _____.

A
$$0.7V$$

B
$$0.3V$$

C
$$0.6V$$

D
$$3V$$

Solution

The junction voltage $$V_{o}$$ for a germanium diode is 0.3 V at room temperature. This potential opposes the diffusion of electrons from n-side and holes from p-side. It is 0.7 eV for Si at room temperature.
Question 5
1 / -0

The truth table given below is for (A and B are the inputs, Y is the output)
A B Y
0 0 1
0 1 1
1 0 1
1 1 0

A
NOR

B
AND

C
XOR

D
NAND

Solution

$$A$$ $$B$$ $$Y$$ $$\bar{Y}$$
0 0 1 0
0 1 1 0
1 0 1 0
1 1 0 1
We can observe from the table that $$\bar { Y } =A.B\Rightarrow Y=\overline { AB } $$
So, the table represents a NAND gate.
Question 6
1 / -0

LED is a p-n junction diode which is

A
forward biased.

B
either forward biased or reverse biased.

C
reverse biased.

D
neither forward biased nor reverse biased.

Solution

An LED is a light emitting diode. The LED emits light when it is forward biased and it emits no light when it is reverse biased. The intensity of light is proportional to the square of the current flowing through the device.
When a junction diode is forward biased, energy is released at the junction due to recombination of electrons and holes. In the junction diode made of gallium arsenide or indium phosphide, the energy is released in visible region. Thus, light is emitted form the diode and hence the name 'light emitting diode'.
Question 7
1 / -0

Which logic gate produces LOW output when any of the inputs is HIGH?

A
AND

B
OR

C
NAND

D
NOR

Solution

The truth table for $$NOR$$ gate is shown above which suggests that $$NOR$$ gate is the logic gate which produces low output when any of the inputs is high.
Question 8
1 / -0

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material most likely is a/an

A
p-type semiconductor

B
insulator

C
metal

D
n-type semiconductor

Solution

In this Band diagram, number of holes in valence band are more as compared to no.number of electrons in the conduction band. So, it is a p-type semiconductor.
Question 9
1 / -0

The energy band gap (distance between the conduction band and valence band) in conductor is.

A
$$0$$

B
$$4\overset{o}{A}$$

C
$$10\overset{o}{A}$$

D
$$100\overset{o}{A}$$

Solution

In conductors, the valence band and conduction band overlap each other or have the extremely small energy gap between them approximately equal to zero.
Question 10
1 / -0

In insulators________. (C.B is conduction band and V.B is valence band)

A
V.B. is partially filled with electrons

B
C.B. is partially filled with electrons

C
C.B. is empty and V.B. is filled with electrons

D
C.B. is filled with electrons and V.B. is empty

Solution

As shown in the image, insulators have a very large forbidden gap. Their conduction band is empty, thus they cannot conduct electricity under normal room temperature and pressure conditions. The valence band is full.

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$$A$$	$$B$$	$$Y$$	$$\bar{Y}$$
0	0	1	0
0	1	1	0
1	0	1	0
1	1	0	1

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 12

Result

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 12

Score

-

Rank

-

SHARING IS CARING

Question 1

oscillator

regulator

rectifier

fliter

Solution

Question 2

electron

hole

proton

position

Solution

Question 3

transistor

abacus

computer

calculator

Solution

Question 4

$$0.7V$$

$$0.3V$$

$$0.6V$$

$$3V$$

Solution

Question 5

NOR

AND

XOR

NAND

Solution

Question 6

forward biased.

either forward biased or reverse biased.

reverse biased.

neither forward biased nor reverse biased.

Solution

Question 7

AND

OR

NAND

NOR

Solution

Question 8

p-type semiconductor

insulator

metal

n-type semiconductor

Solution

Question 9

$$0$$

$$4\overset{o}{A}$$

$$10\overset{o}{A}$$

$$100\overset{o}{A}$$

Solution

Question 10

V.B. is partially filled with electrons

C.B. is partially filled with electrons

C.B. is empty and V.B. is filled with electrons

C.B. is filled with electrons and V.B. is empty

Solution

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