Semiconductor Principles MCQs

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A commonly used pentavalent material is:

  • A. arsenic
  • B. boron
  • C. gallium
  • D. neon
  • Correct Answer: Option A

A P-N junction mimics a closed switch when it:

  • A. has a low junction resistance
  • B. is reverse biased
  • C. cannot overcome its barrier voltage
  • D. has a wide depletion region
  • Correct Answer: Option A

Atoms that normally have three electrons in their outer shell are called __________________ atoms.

  • A. trivalent
  • B. pentavalent
  • C. tetravalent
  • D. charged
  • Correct Answer: Option A

Electron pair bonding occurs when atoms:

  • A. lack electrons
  • B. share holes
  • C. lack holes
  • D. share electrons
  • Correct Answer: Option D

Elements with 1, 2, or 3 valence electrons usually make excellent:

  • A. conductors
  • B. semiconductors
  • C. insulators
  • D. neutral
  • Correct Answer: Option A

Forward bias of a silicon P-N junction will produce a barrier voltage of approximately how many volts?

  • A. 0.2
  • B. 0.3
  • C. 0.7
  • D. 0.8
  • Correct Answer: Option C

How many valence electrons are in every semiconductor material?

  • A. 1
  • B. 2
  • C. 3
  • D. 4
  • Correct Answer: Option D

If conductance increases as temperature increases, this is known as a:

  • A. positive coefficient
  • B. negative current flow
  • C. negative coefficient
  • D. positive resistance
  • Correct Answer: Option C

In “n” type material, majority carriers would be:

  • A. holes
  • B. dopants
  • C. slower
  • D. electrons
  • Correct Answer: Option D

In “p” type material, minority carriers would be:

  • A. holes
  • B. dopants
  • C. slower
  • D. electrons
  • Correct Answer: Option D

Intrinsic semiconductor material is characterized by a valence shell of how many electrons?

  • A. 1
  • B. 2
  • C. 4
  • D. 6
  • Correct Answer: Option C

Ionization within a P-N junction causes a layer on each side of the barrier called the:

  • A. junction
  • B. depletion region
  • C. barrier voltage
  • D. forward voltage
  • Correct Answer: Option B

Minority carriers are many times activated by:

  • A. heat
  • B. pressure
  • C. dopants
  • D. forward bias
  • Correct Answer: Option A

Reverse bias is a condition that essentially ___________ current through the diode.

  • A. allows
  • B. prevents
  • C. increases
  • D. blocks
  • Correct Answer: Option B

Silicon atoms combine into an orderly pattern called a:

  • A. covalent bond
  • B. crystal
  • C. semiconductor
  • D. valence orbit
  • Correct Answer: Option B

Solid state devices were first manufactured during:

  • A. World War 2
  • B. 1904
  • C. 1907
  • D. 1960
  • Correct Answer: Option D

What can a semiconductor sense?

  • A. magnetism
  • B. temperature
  • C. pressure
  • D. all of the above
  • Correct Answer: Option D

What causes the depletion region?

  • A. doping
  • B. diffusion
  • C. barrier potential
  • D. ions
  • Correct Answer: Option B

What electrical characteristic of intrinsic semiconductor material is controlled by the addition of impurities?

  • A. conductivity
  • B. resistance
  • C. power
  • D. all of the above
  • Correct Answer: Option A

What is a type of doping material?

  • A. extrinsic semiconductor material
  • B. pentavalent material
  • C. n-type semiconductor
  • D. majority carriers
  • Correct Answer: Option B

What is an energy gap?

  • A. the space between two orbital shells
  • B. the energy equal to the energy acquired by an electron passing a 1 V electric field
  • C. the energy band in which electrons can move freely
  • D. an energy level at which an electron can exist
  • Correct Answer: Option A

What is the most significant development in electronics since World War II?

  • A. the development of color TV
  • B. the development of the diode
  • C. the development of the transistor
  • D. the development of the TRIAC
  • Correct Answer: Option C

When an electron jumps from the valence shell to the conduction band, it leaves a gap. What is this gap called?

  • A. energy gap
  • B. hole
  • C. electron-hole pair
  • D. recombination
  • Correct Answer: Option B

When and who discovered that more than one transistor could be constructed on a single piece of semiconductor material:

  • A. 1949, William Schockley
  • B. 1955, Walter Bratten
  • C. 1959, Robert Noyce
  • D. 1960, John Bardeen
  • Correct Answer: Option C

When is a P-N junction formed?

  • A. in a depletion region
  • B. in a large reverse biased region
  • C. the point at which two opposite doped materials come together
  • D. whenever there is a forward voltage drop
  • Correct Answer: Option C

Which material may also be considered a semiconductor element?

  • A. carbon
  • B. ceramic
  • C. mica
  • D. argon
  • Correct Answer: Option A

Which of the following cannot actually move?

  • A. majority carriers
  • B. ions
  • C. holes
  • D. free electrons
  • Correct Answer: Option B

Which semiconductor material is made from coal ash?

  • A. germanium
  • B. silicon
  • C. tin
  • D. carbon
  • Correct Answer: Option A