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Semiconducting Materials

Total questions: 50

Worksheet time: 26mins

Name
Class
Date
1.

Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of

a)

diode

b)

semiconductor

c)

conductor

d)

insulator

e)

superconductor

2.

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

3.

These are the characteristics of Trivalent impurities except

a)

•3 valence electrons

b)

•produce p-type semiconductors

c)

•producing a "hole".

d)

Antimony, arsenic, and phosphorus are the examples

4.

The characteristics of p-type semiconductors is includes

a)

Majority carriers are electron

b)

Has tendency to gain electron

c)

Has tendency to donor electron

d)

Easy to conduct electricity

5.

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

a)

Doping

b)

Ionization

c)

Recombination

d)

Atomic modification

6.

Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of

a)

diode

b)

semiconductor

c)

conductor

d)

insulator

e)

superconductor

7.

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

a)

Quartz

b)

Silicon

c)

Diamond

d)

Tantalum

8.
Name this electronic component
a)
Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Transistor
9.

How is conduction increased in an p-type semiconductor?

a)

by increased applied electrical field

b)

by decreased applied electrical field

c)

by the availability of extra holes

d)

by the availability of donor electrons

10.

A material that conducts electricity well tends to have ____.

a)

no valence electrons

b)

partially filled bands

c)

completely filled bands

d)

conduction and valence bands that are far apart

11.

Which of the following is a semiconductor?

a)

Silicon

b)

Copper

c)

Plastic

d)

Brass

12.

What is the term for the object that is in between a conductor and an insulator?

a)

Conductor

b)

Semiconductor

c)

Insulator

d)

Brass

13.

Which of the following is a material that does NOT allow current to easily flow through it?

a)

Conductor

b)

Insulator

c)

Semiconductor

d)

Silicon

14.

Which of the following is a generator?

a)
b)
c)
d)
15.

Which of the following is an example of a motor?

a)
b)
c)
d)
16.

What is the term of a semiconductor that allows current to flow in only one direction?

a)

Diode

b)

Transistor

c)

Conductor

d)

Insulator

17.

Which of the following is an example of a diode?

a)

Transistor radio

b)

Motor

c)

Generator

d)

LEDs

18.

What does a transistor do?

a)

Work as a conductor

b)

Amplify sound

c)

Work as an insulator

d)

None of these

19.
1. The resistivity of a semiconductor lies between 
a)
(a)10 -6 Ωm to10-8 Ωm
b)
n(b) 108 Ωm to1014 Ωm
c)
(c) 10 -2 Ωm to104 Ωm
d)
(d) none of these
20.
2. The forbiddenn energy gap for Germanium is of the order of
a)
(a) 0.7 eV
b)
(b) 0.3 eV
c)
(c) 1.1 eV
d)
(d) 10 eV
21.
3. Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
a)
(a) Boron 
b)
Arsenic
c)
Indium
d)
Gallium
22.
The reverse saturation current in a PN Junction diode is only due to 
a)
majority carriers
b)
minority carriers
c)
acceptor ions
d)
donor ions
23.

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.

24.

which statement is correct? (the dark circles represent the electrons)

a)

p-type of the diode is connected to the negative terminal.

b)

Electron moves across the p-n junction, makes the diode forward biased

c)

current will not flow in the circuit

d)

reverse biased circuit

25.

The characteristics of p-type semiconductors is includes

a)

Majority carriers are electron

b)

Has tendency to gain electron

c)

Has tendency to donor electron

d)

Easy to conduct electricity

26.

The minority carriers in P-type silicon are called _________________

a)

Neutron

b)

Proton

c)

Electron

d)

Hole

27.

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

28.

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

29.

Let np and ne be the number density of holes and conduction electrons respectively in a semiconductor. Then,

a)

np > ne in an intrinsic semiconductor, I < Ip + Ie

b)

np = ne in an extrinsic semiconductor, I > Ip + Ie

c)

np = ne in an intrinsic semiconductor, I = Ip + Ie

d)

np > ne in an intrinsic semiconductor, I = 0( Here, Ip = current due to holes,Ie= current due to electrons, I= total current)

30.

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

31.

The nucleus of an atom is made up of

a)

protons and neutrons

b)

electrons

c)

electrons and protons

d)

electrons and neutrons

32.

The most widely used semi-conductive material in electronic device

a)

germanium

b)

carbon

c)

cooper

d)

silicon

33.

The energy band in which free electrons exist is the

a)

first band

b)

second band

c)

conductive band

d)

valence band

34.

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

35.

What is the name of this Diode?

a)

PN junction

b)

LED

c)

silicon

d)

PNP

36.

Device which converts electrical energy to light energy

a)

Optocoupler

b)

Regulator

c)

Light Emitting Diode

d)

Photodiode

37.

In an LED, the region responsible for emission of light is called as ____________________

a)

Passive region

b)

P region

c)

Active region

d)

N region

38.
Most of the elements on the periodic table are classified as ...
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Semiconductors
39.
The elements on the "green stair step" are known as ...
a)
Semiconductors/ Metalloids
b)
Metals
c)
Nonmetals
d)
Metal transformers
40.

Which of the following statements is incorrect?

a)

Conduction within pure semiconductors is termed intrinsic conduction.

b)

Doping pure semiconductor material with small amounts of donar impurities produces an n-type semiconductor.

c)

The dominant charge carriers within a doped semiconductor are called majority charge carriers.

d)

At room temperatures, pure semiconductors make excellent conductors.

41.

The intensity of light emitted by an LED depends on

a)

forward bias

b)

reverse bias

c)

band gap

d)

forward current

42.

By which properties, the orientation of molecules in a layer of liquid crystals can be changed?

a)

Magnetic field

b)

Electric field

c)

Electromagnetic field

d)

Gravitational field

43.

The full form of LCD is

a)

Liquid Crystal Display

b)

Liquid Crystalline Display

c)

Logical Crystal Display

d)

Logical Crystalline Display

44.

The optical properties of liquid crystals depend on the direction of

a)

Air

b)

Solid

c)

Light

d)

Water

45.

Electrical strain gauge works on the principle of

a)

variation of resistance

b)

variation of capacitance

c)

variation of inductance

d)

variation of area

46.

At room temperature, an intrinsic silicon crystal acts approximately as

a)

A battery

b)

A conductor

c)

An insulator

d)

A piece of copper wire

47.

Which method can be used to distinguish between the two types of carriers?

a)

Hall effect

b)

Rayleigh method

c)

Doppler effect

d)

Fermi effect

48.

The solar or photo voltaic cell converts:

a)

Chemical energy to electrical energy

b)

Solar radiation into electrical energy

c)

Solar radiation into thermal energy

d)

Thermal energy into electrical energy

49.

Which column elements are combined to make compound semiconductors?

a)

First and fourth

b)

Fifth and sixth

c)

Second and fourth

d)

Third and fifth

50.

A semiconductor has ………… temperature coefficient of resistance.

a)

Positive

b)

Zero

c)

Negative

d)

None of the above

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