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Advanced Semiconductor

Total questions: 80

Worksheet time: 41mins

Name
Class
Date
1.

A semiconductor has generally ……………… valence electrons.

a)

2

b)

3

c)

6

d)

4

2.

Doping of Semiconductors

a)

materials which can conduct electricity better than insulator, but not as well as conductors.

b)

The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.

c)

when 4 electrons in outermost orbit.

3.

The process of adding an impurity to an intrinsic semiconductor is called

a)

Doping

b)

Ionization

c)

Recombination

d)

Atomic modification

4.

The minority carriers in P-type silicon are called _________________

a)

Neutron

b)

Proton

c)

Electron

d)

Hole

5.

During formation of p-n junction

a)

an electron diffuses from n to p side

b)

a hole diffuses from p to n side

c)

a hole diffuses from n to p side

d)

an electron diffuses from p to n side

6.

Which is not one of the properties of semiconductor?

a)

4 electrons in outermost orbit, in covalent bonding.

b)

atoms vibrate causes electron to break free from the bonds.

c)

Electron free leaves hole.

d)

Semiconductor has 2 types of charge carriers.

e)

all of the above are the properties of it

7.

Which among these is NOT a semiconductor

a)

Germanium

b)

Silicon

c)

Gallium Arsenide

d)

Titanium

8.

Electrons and holes are equal in magnitude but opposite in polarity

a)

True

b)

False

9.

An n type semiconductor is negatively charged

a)

True

b)

False

10.

Who contribute to the current in a semiconductor

a)

electrons only

b)

holes only

c)

negative ions

d)

both electrons and holes

11.

Addition of trivalent impurity to a semiconductor creates many ……..

a)

Holes

b)

Free electrons

c)

Valence electrons

d)

Bound electrons

12.

When a pentavalent impurity is added to a pure semiconductor, it becomes ………

a)

An insulator

b)

An intrinsic semiconductor

c)

p-type semiconductor

d)

n-type semiconductor

13.

The battery connections required to forward bias a pn junction are ……

a)

+ve terminal to p and –ve terminal to n

b)

-ve terminal to p and +ve terminal to n

c)

-ve terminal to p and –ve terminal to n

d)

None of the above

14.

With forward bias to a pn junction , the width of depletion layer ………

a)

Decreases

b)

Increases

c)

Remains the same

d)

None of the above

15.

At room temperature, an intrinsic semiconductor has ……….

a)

Many holes only

b)

A few free electrons and holes

c)

Many free electrons only

d)

No holes or free electrons

16.

The minority carriers in P-type silicon are called _________________

a)

Neutron

b)

Proton

c)

Electron

d)

Hole

17.

Basic building blocks of all electronic circuits are

a)

Devices in which there is a flow of electrons

b)

devices in which there is no flow of electrons

c)

devices in which there is a controlled flow of electrons

d)

devices in which there is an uncontrolled flow of electrons

18.

conductivity of semiconductor increases with increase in temperature, because

a)

number density of free charge carriers increases

b)

relaxation time increases

c)

both number density of free charge carriers and relaxation time increases

d)

number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

19.

During formation of p-n junction

a)

an electron diffuses from n to p side

b)

a hole diffuses from p to n side

c)

a hole diffuses from n to p side

d)

an electron diffuses from p to n side

20.

Which among these is NOT the property of a semiconductor?

a)

Four electrons in the valence band forming covalent bonds

b)

At 0 Kelvin semiconductor acts like an insulator

c)

Semiconductors have two type of charge carriers

d)

Semiconductors are temperature insensitive

21.

Which among these is the fundamental characteristic of a p type semiconductor

a)

Electrons are the majority charge carriers

b)

Has a tendency to gain an electron

c)

Has a tendency to donate an electron

d)

Easy to conduct electricity

22.

Method implemented to increase conductivity is

a)

Increase electrical field

b)

Increase temperature

c)

Increase doping concentration

d)

Shining light of proper wavelength on the semiconductor

e)

All of the above

23.

Electrons and holes are equal in magnitude but opposite in polarity

a)

True

b)

False

24.

Which semiconductor has higher conductivity at room temperature

a)

Silicon

b)

Germanium

c)

Gallium Arsenide

25.

Which charge carrier has higher mobility?

a)

Electrons

b)

Holes

c)

Both electrons and holes

26.

The ratio of majority and minority charge carriers in intrinsic semiconductors is unity

a)

True

b)

False

27.

Which of the following is a symbol of NPN transistor ?

a)
b)
c)
d)
28.

What is the name of this component?

a)

PN junction

b)

LED

c)

silicon

d)

PNP

29.
Diode 
a)
 allows current to flow in one direction
b)
 allows current to flow in two directions
c)
is a resistor
30.

Which of the following acts as a donor impurity in doping process ?

a)

Arsenic

b)

Indium

c)

Gallium

d)

Boron

31.
Name this electronic component
a)
Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Transistor
32.

LED is

a)

Light Enhancing Diode

b)

Light Emitting Diode

c)

Light Emitting Detector

d)

Light Enhancing Detector

33.

The energy band in which free electrons exist is know as

a)

first band

b)

second band

c)

conductive band

d)

valence band

34.

What is the most common semiconductor material used for producing integrated circuits

a)

Quartz

b)

Silicon

c)

Diamond

d)

Tantalum

35.

2. Semiconductors are further classified on the basis if impurities added or not

In case impurities added ______

In case impurities not added_____

(a)  

36.

3. What do you mean by 'doping'?

a)

Impurities are added

b)

Some impurities are added

c)

No impurities are added

d)

None of them

37.

. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

a)

Doping

b)

Free Electrons

c)

Thermal Energy

d)

Valence

38.

When a voltage is applied to a semiconductor crystal then free electrons will flow

a)

Away from the negative potential

b)

Toward the positive potential

c)

In the external circuit

d)

None of the above

39.

Which is the principal characteristic of a tunnel diode?

a)

a very high PIV

b)

a high forward current rating

c)

a high forward resistance

d)

a negative resistance region

40.

What are the three terminals in a FET transistor?

a)

gate, source, drain

b)

base, emitter, collector

c)

gate, base, drain

d)

source, drain, collector

41.

What transistor has two operating modes: enhancement mode and depletion mode?

a)

MOSFET

b)

FET

c)

JFET

42.

Which of the following is NOT a part of a diode?

a)

anode

b)

band

c)

bridge

d)

cathode

43.

Every known element has

a)

the same type of atoms

b)

the same number of atoms

c)

a unique type of atom

d)

several different types of atoms

44.

An atom consists of

a)

one nucleus and only one electron

b)

one nucleus and one or more electrons

c)

protons, electrons and neutrons

d)

answer (b) and (c)

45.

Valence electrons are

a)

in the closest orbit to the nucleus

b)

in the most distant orbit from the nucleus

c)

in various orbits around the nucleus

d)

not associated with a particular atom

46.

The nucleus of an atom is made up of

a)

protons and neutrons

b)

electrons

c)

electrons and protons

d)

electrons and neutrons

47.

The most widely used semi-conductive material in electronic device

a)

germanium

b)

carbon

c)

cooper

d)

silicon

48.

The energy band in which free electrons exist is the

a)

first band

b)

second band

c)

conductive band

d)

valence band

49.

The current in a semiconductor is produced by

a)

electron only

b)

holes only

c)

negative ions

d)

both electrons and holes

50.

Semiconductor are substances whose electrical conductivity lies between that of

a)

conductor and insulator

b)

conductor and metal

c)

plastic and wood

d)

insulator and gold

51.

Colour of the LED output light is decided by

a)

coloured glass covering it

b)

colour added at time of manufacturing

c)

material used for its construction

d)

size of LED

52.

A device that converts the energy of light directly into electrical energy is

a)

photodiode

b)

LED

c)

Solar Cell

d)

rectifier diode

53.

Semiconductor is defined as

a)

substance for the width of the forbiden energy region is

1eV

b)

germanium and silicon are having band gap of 0.785 and 1.21eV

respectively

c)

These are known as intrinsic semiconductor

d)

The forbiden band seprates the filled valence region

electronfrom the vacant band

54.

Semiconductors behave as insulator state at condition

a)

valence band remains full,the conduction band is emptyat low

temperature

b)

some of the valence electrons acquire thermal energy greater than energy acquired in forbidden band gap

c)

conducting electrons becomes slightly conducting.

d)

insulators become slightly conducting

55.

The phrase "holes in a semiconductor"

a)

holes may serve as carrier of electriciy

b)

empty energy level in an otherwise filled valence band

c)

mechanism by which a hole contribute to conductivity

d)

results in allowable energy states which lie in the forbidden

energy gap

56.

Drift currents are given by

a)
b)
c)
d)
57.

Give an example for Semiconductor Material

a)

Copper

b)

Nichrome

c)

Glass

d)

Germanium

58.

The forbidden Energygap of Silicon is

(a)  

59.

Co-valent bonds are formed by sharing of valence electrons

a)

True

b)

False

60.

In solids, _________in outer most orbits of atoms determine its electrical properties

a)

protons

b)

neutron

c)

electrons

d)

positron

61.

Electron occupying an energy level can be determined by

a)

probability function F(E)

b)

probability function Z(E)

c)

Normalized function F(E)

d)

Occupation function N(E)

62.

Highest energy level that can be occupied by an electron at 0 K

a)

Excited state

b)

Conduction state

c)

Fermi energy

d)

Average energy

63.

If F(E) =1, then

a)

0% probability that the electrons to occupy energy level below Fermi level

b)

50% probability that the electrons to occupy energy level below Fermi level

c)

75% probability that the electrons to occupy energy level below Fermi level

d)

100% probability that the electrons to occupy energy level below Fermi level

64.

Wolfgang Pauli formulated the law stating that ____ electrons can have the same set of quantum numbers.

a)

no two

b)

only two

c)

only one

d)

no one

65.

In density of states, the shape of metal piece considered initially was

a)

sphere

b)

shell

c)

cube

d)

cylinder

66.

What is the most common semiconductor material used for producing integrated circuits

a)

Quartz

b)

Silicon

c)

Diamond

d)

Tantalum

67.

Determine the notations of electron in every layer of Silicon

a)

2. 8. 4

b)

8. 2. 4

c)

2. 4. 4

d)

4. 8. 4

68.

The characteristic of n-type semiconductor including ____________

a)

Majority carrier is electron

b)

Majority carrier hole

c)

Minority carrier electron

d)

Majority carrier photon

69.

The characteristic of covalent bond in semiconductor are TRUE except ___________

a)

Strong bond

b)

Sharing outer layer electron

c)

Can be break at high temperature

d)

Has tendency to donor electron

70.

In semiconductor the forbidden energy gap lies

a)

Just below the conduction band

b)

Just above the conduction band

c)

Either above or below the conduction band

d)

Between the valence band and conduction band

71.

In a N-type semiconductor, the Fermi level lies in

a)

centre of the energy gap

b)

lower than the centre of energy gap

c)

higher than the centre of energy gap

d)

Can be anywhere depending upon the doping concentration

72.

Which charge carrier has higher mobility?

a)

Electrons

b)

Holes

c)

Both electrons and holes

73.

Which semiconductor has higher conductivity at room temperature

a)

Silicon

b)

Germanium

c)

Gallium Arsenide

74.

Which among these is the fundamental characteristic of a p type semiconductor

a)

Electrons are the majority charge carriers

b)

Has a tendency to gain an electron

c)

Has a tendency to donate an electron

d)

Easy to conduct electricity

75.

What is the semiconductor diode used as?

a)

a) Oscillator

b)

b) Amplifier

c)

c) Rectifier

76.

in p-type semiconductor majority carriers are

a)

holes

b)

free electrons

c)

protons

77.

A material that offers a very low level of conductivity under an applied voltage is known as

a)

Semiconductor

b)

Conductor

c)

Insulator

d)

Dielectric

78.

The energy band in which free electrons exist is the

a)

Valence Band

b)

Conduction Band

c)

First Band

d)

Second Band

79.

What determines whether a solid material will act as a conductor, a semiconductor or an insulator?

a)

The energy level of the valence band

b)

The energy level of the conduction band

c)

The energy difference across the forbidden gap

d)

None of the answer mentioned above

80.

Which of the sentence describe a p-type semiconductor?

a)

Electrically stable

b)

Positively charged ion

c)

Negatively charged ion

d)

Has many free electrons

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