Semiconductors MCQs

Semiconductors MCQs

These Semiconductors multiple-choice questions and their answers will help you strengthen your grip on the subject of Semiconductors. You can prepare for an upcoming exam or job interview with these 100+ Semiconductors MCQs.
So scroll down and start answering.

1: What do diodes do?

A.   Open current flow for in all directions

B.   Block current in one direction while letting current flow in another direction.

C.   Close current flow in all directions

2: What is the only p-type dopant used in silicon device manufacturing?

A.   Antimony

B.   Phosphorus

C.   Arsenic

D.   Boron

3: What mathematical formula most accurately predicts the Fermi level of a semiconductor?

A.   Fermi-Dirac distribution

B.   Maxwell-Boltzmann distribution

C.   Bose-Einstein distribution

4: Diodes and most photovoltaic cells contain which feature?

A.   A p-n junction

B.   An Early voltage

C.   A metal-insulator-metal junction

D.   A Hall effect junction

5: When silicon has been doped, what does this mean?

A.   It has been melted and stirred.

B.   Impurities have been added to make it less conductive.

C.   Impurities have been added that alter its electronic properties in a controllable way.

D.   It has had all of its impurities removed.

6: What does 'doping' do?

A.   Changes a semiconductor's behavior

B.   Duplicate the semiconductor

C.   Oxygenate a semiconductor

D.   Purifies a semiconductor

7: Can pure silicon alone be used to make a semiconductor?

A.   Yes. All semiconductors are found in sand quarries.

B.   No. It needs impurities to become semi-conductive.

C.   Yes.

D.   Yes. The purer, the better.

8: What are the two basic types of impurities used in semiconductor doping?

A.   N-Type & P-Type

B.   Schottky & De Forest

C.   Left-handed & Right-handed

D.   Intrinsic & Extrinsic

9: At which frequency, capacitive reactance equals to inductive reactance?

A.   cut off frequency

B.   Matching Frequency

C.   Resonant Frequency

D.   Tunning Frequency

10: What law predicts the future of integrated circuits?

A.   Miller's

B.   Marleau's

C.   Moore's

D.   Marchand's

11: What are the four terminals of an FET transistor?

A.   Source, gate, signal, and body.

B.   Sand, gate, drain, and body.

C.   Source, NOR, AND, and OR.

D.   Source, gate, drain, and body.

12: What is the reason for reducing drain doping in a metal-oxide semiconductor device design?

A.   To increase line focus

B.   To improve breakdown voltage

C.   To reduce step response time

D.   To reduce the buildup of calcium carbonate

13: What are the two bands in which an electron can reside?

A.   Resistive and conductive

B.   Gamma and delta

C.   Photon and phonon

D.   Valence and conduction

14: What is the simplest semiconductor device?

A.   Resistors

B.   Electron

C.   Diode

D.   Transistor

15: What is a semiconductor?

A.   Half a conductor.

B.   A conductor that doesn't work very well.

C.   The combination of a conductive material, and an insulator.

D.   Two halves of a conductor.

16: What is a common scheme of electrical polarity in a MOSFET transistor?

A.   N-n-n, and p-n-p.

B.   N-p-r, u-p-n

C.   n-p-n, and p-n-p.

D.   n-p-n, and p-n-n-p.

17: Which of the following is a type of transistor?


B.   MTT

C.   NRT

D.   BJT

18: Why are semiconductors important?

A.   They are not important.

B.   They are large and durable.

C.   They successfully replaced vacuum tubes as the primary way to compute data.

D.   They replaced silicon.

19: What are the components of a MOSFET?

A.   Source, drain, and gate

B.   Voltage, current, and resistivity

C.   Emitter, collector, and base

D.   Dopant, acceptor, and donor

20: The process of deliberately adding impurities to affect conductivity is called:

A.   Fabrication

B.   Insertion

C.   Photolithography

D.   Doping

21: When infusing impurities into silicon to make a semiconductor, what is this process called?

A.   Melting.

B.   Cracking.

C.   Doping.

D.   Conducting.

22: What does BJT stand for?

A.   Bimetallic Jennings transistor

B.   Back justified transistor

C.   Boron joint transistor

D.   Bipolar junction transistor

23: What are semiconductors made out of primarily?

A.   Salt.

B.   Silicon.

C.   Glass.

D.   Rubber.

24: What does LED stand for?

A.   Light Emission Device

B.   Light Electromagnetic Diode

C.   Light Emitting Diode

D.   Light Electron Device

25: What does the acronym IGBT stand for?

A.   Insulated gate bipolar transistor.

B.   Intrinsic germanium-based transistor

C.   Inert gate bidirectional transistor

D.   Iodine graphite boron transistor

26: An electron is a _____

A.   fermion

B.   boson

27: What is a III-V semiconductor?

A.   A semiconductor made of three parts of one element to five parts of another element

B.   A semiconductor made from elements in columns III and V of the periodic table

C.   A semiconductor with conduction bands at 3 eV and 5 eV

28: What type of semiconductor do you get if you dope it with boron?

A.   An n-type semiconductor.

B.   A boronic transistor.

C.   A boric reaction transistor.

D.   A p-type semiconductor.

29: Which two formulas determine the carrier distribution of a semiconductor?

A.   Fermi-Dirac distribution & density of states

B.   Ohm's law & Kirchhoff's current law

C.   Riemann zeta function & Fourier transform

D.   Bose-Einstein distribution & Bessel functions

30: The process by which electrons and holes annihilate is called:

A.   Tunneling

B.   Spontaneous emission

C.   Initialization

D.   Recombination

31: What three primary types of carrier action occur inside a semiconductor?

A.   Drift, Diffusion, Recombination-Generation

B.   Recombination-Generation, Dissension, Diffusion

C.   Dissension, Drift, Recombination-Generation

D.   Drift, Diffusion, Dissension

32: Which of the following is a voltage controlled device?

A.   BJT

B.   SCR



33: Where must doping be added within a semiconductor to alter their conductivity?

A.   Their crystal lattice.

B.   Their outside.

C.   Their center.

D.   Their layers.

34: What is an exciton?

A.   A photon-phonon pair

B.   An electron-hole pair

C.   A magnetic monopole

D.   A bandgap resonance

35: The wavelength of light emitted by an LED is determined by its:

A.   bandgap

B.   phonon frequency

C.   electron effective mass

D.   permittivity

36: The electron-volt is a unit of:

A.   Potential

B.   Energy

C.   Conductivity

D.   Power

37: Which concept describes the chemical potential of a semiconductor?

A.   Fermi energy

B.   Dirac statistics

C.   Fermi level

D.   Fermion level

38: What technique is commonly used to pattern semiconductors?

A.   Photolithography

B.   Chemical Vapor Deposition (CVD)


D.   Sputtering

39: In ellipsometry, the azimuth is the angle between the _______ and the plane of incidence.

A.   semi-minor axis of the ellipse

B.   major axis of the ellipse

C.   major chord

D.   minor axis of the ellipse

40: A degenerate semiconductor has which of the following characteristics?

A.   All of these are characteristics of a degenerate semiconductor

B.   It conducts like a metal

C.   Its Fermi level is nearly equal to its conduction or valence band energy

D.   It is highly doped

41: Memristors are also known as _________.

A.   Metal Transistors

B.   Memory Thyristors

C.   Metal Resistors

D.   Memory resistors

42: On a circuit board what letter usually marks a transistor?

A.   L

B.   Q

C.   T

D.   R

43: What devices are typically used to control volume in electronics?

A.   Transistors

B.   Inductors

C.   Diodes

D.   Resistors

44: What is the maximum theoretical efficiency for a single-junction silicon solar cell?

A.   17%

B.   33%

C.   52%

D.   21%

45: What are the four elements in CIGS?

A.   Copper, indium, gallium, selenium

B.   Cadmium, indium, germanium, sulphur

C.   Copper, indium, gallium, silver

D.   Carbon, iodine, germanium, sulphur

46: What is the value of kT at room temperature?

A.   1.12 eV

B.   25.6 meV

C.   15 eV

D.   137 meV

47: Which type of element is most widely used for the manufacture of semiconductor devices?

A.   Group IV

B.   Group V

C.   Group III

D.   Group VI

48: What is the term for a semiconductor device manufacturing plant?

A.   Fab

B.   Chip shop

C.   Semiconductor production facility (SPF)

D.   Platter plant

49: What is the bandgap of silicon?

A.   1.12 eV

B.   1.41 eV

C.   2.83 eV

D.   0.79 eV

50: Which semiconductor has a direct bandgap?

A.   Germanium

B.   Gallium arsenide

C.   Silicon carbide

D.   Silicon