Semiconductor Electronics: Materials, Devices and Simple Circuits Test 58

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 58

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Question 1
1 / -0

When the electrical conductivity of a semi-conductor is due to the breaking of its covalent bonds, then the semiconductor is said to be

A
Donar

B
Aceptor

C
Intrinsic

D
Exterinsic

Solution

Intrinsic $$\Rightarrow$$ Conductivity is due to the breaking of covalent bond
Extrisnsic semiconductor $$\Rightarrow$$ Conductivity is due to the breaking of covalent bond and excess of charge carriers due to impurity.
Question 2
1 / -0

Bonding in a germanium crystal (semi-conductor) is

A
Metallic

B
Ionic

C
Vander Waal's type

D
Covalent

Solution

Covalent bonding exists in semi-conductor.
Question 3
1 / -0

The laptop PC's modern electronic watches and calculator use the following for display

A
Single crystal

B
Poly crystal

C
Liquid crystal

D
Semiconductors

Solution

The laptop PC's modern electronic watches and calculator use the Liquid crystal for display.
Question 4
1 / -0

Electrical conductivity of a semiconductor

A
Decrease with the rise in its temperature

B
Increase with the rise in its temperature

C
Does not change with the rise in its temeprature

D
First increases and then decreases with the rise in its temperature

Solution

With temperature rise electrical conductivity of semiconductors increases.
Question 5
1 / -0

In good conductors of electricity, the type of bonding that exists is

A
Ionic

B
Vander Waals

C
Covalent

D
Metallic

Solution

In good conductors of electricity, the type of bonding that exists is metallic bonding.
Question 6
1 / -0

Zener breakdown in a semi-conductor diode occurs when

A
Forward current exceeds certain value

B
Reverse bias exceeds certain value

C
Forward bias exceeds certain value

D
Potential barrier is reduced to zero

Solution

When reverse bias is increased, the electric field at the junction also increases. At some stage the electric field breaks the covalent bond, thus the large number of charge carriers are generated . This is called Zener breakdown
Question 7
1 / -0

When the $$P$$ end of $$P-N$$ junction is connected to the negative terminal of battery and the $$N$$ end to the positive terminals of the battery, then the $$P-N$$ junction behaves like

A
A conductor

B
An insulator

C
A super-conductor

D
A semi-conductor

Solution

In this condition $$P-N$$ junction is reverse biased that's why when the P end of $$P−N$$ junction is connected to the negative terminal of battery and the $$N$$ end to the positive terminals of the battery, then the $$P−N$$ junction behaves like an insulator.
Question 8
1 / -0

The intrinsic semiconductor becomes an insulator at

A
$$0^{o}C$$

B
$$-100^{o}C$$

C
$$300\ K$$

D
$$0\ K$$

Solution

At $$0\ K$$ temperature semiconductor behaves as an insulator,because at very low temperature electrons cannot jump from the valence band to conduction band.
Question 9
1 / -0

Which is the correct diagram of a half-wave rectifier

A

B

C

D

Solution

The half wave rectifier is the circuit designed using the diode which is used for converting the AC voltage signal into the DC voltage. The half wave rectifier only passes the one half of the input sine wave (either positive or negative) and rejects the other half. The output of the half wave rectifier is pulsating DC.
Question 10
1 / -0

A logic gate is an electric

A
Makes logic decision

B
Allows electrons flow only in one direction

C
Work binary algebra

D
Alternates between $$0$$ and $$1$$ values

Solution

A logic gate is an idealized or physical electronic device implementing a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output.