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Introduction to Semiconductors – Gibilisco MCQs in Electronics

Multiple choice questions in Introduction to Semiconductors

This is the Multiple Choice Questions (MCQs) in Chapter 19: Introduction to Semiconductors from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

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1. The term “semiconductor” arises from:

  • A. Resistor-like properties of metal oxides.
  • B. Variable conductive properties of some materials.
  • C. The fact that there’s nothing better to call silicon.
  • D. Insulating properties of silicon and GaAs.

2. Which of the following is not an advantage of semiconductor devices over vacuum tubes?

  • A. Smaller size.
  • B. Lower working voltage.
  • C. Lighter weight.
  • D. Ability to withstand high voltages.

3. The most common semiconductor among the following substances is:

  • A. Germanium.
  • B. Galena.
  • C. Silicon.
  • D. Copper.

4. GaAs is a(n):

  • A. Compound.
  • B. Element.
  • C. Conductor.
  • D. Gas.

5. A disadvantage of gallium-arsenide devices is that:

  • A. The charge carriers move fast.
  • B. The material does not react to ionizing radiation.
  • C. It is expensive to produce.
  • D. It must be used at high frequencies.

6. Selenium works especially well in:

  • A. Photocells.
  • B. High-frequency detectors.
  • C. Radio-frequency power amplifiers.
  • D. Voltage regulators.

7. Of the following, which material allows the lowest forward voltage drop in a diode?

  • A. Selenium.
  • B. Silicon.
  • C. Copper.
  • D. Germanium.

8. A CMOS integrated circuit:

  • A. Can only work at low frequencies.
  • B. Is susceptible to damage by static.
  • C. Requires considerable power to function.
  • D. Needs very high voltage.

9. The purpose of doping is to:

  • A. Make the charge carriers move faster.
  • B. Cause holes to flow.
  • C. Give a semiconductor material certain properties.
  • D. Protect devices from damage in case of transients.

10. A semiconductor material is made into N type by:

  • A. Adding an acceptor impurity.
  • B. Adding a donor impurity.
  • C. Injecting electrons.
  • D. Taking electrons away.

11. Which of the following does not result from adding an acceptor impurity?

  • A. The material becomes P type.
  • B. Current flows mainly in the form of holes.
  • C. Most of the carriers have positive electric charge.
  • D. The substance has an electron surplus.

12. In a P-type material, electrons are:

  • A. Majority carriers.
  • B. Minority carriers.
  • C. Positively charged.
  • D. Entirely absent.

13. Holes flow from:

  • A. Minus to plus.
  • B. Plus to minus.
  • C. P-type to N-type material.
  • D. N-type to P-type material.

14. When a P-N junction does not conduct, it is:

  • A. Reverse biased.
  • B. Forward biased.
  • C. Biased past the breaker voltage.
  • D. In a state of avalanche effect.

15. Holes flow the opposite way from electrons because:

  • A. Charge carriers flow continuously.
  • B. Charge carriers are passed from atom to atom.
  • C. They have the same polarity.
  • D. No! Holes flow in the same direction as electrons.

16. If an electron has a charge of -1 unit, a hole has:

  • A. A charge of -1 unit.
  • B. No charge.
  • C. A charge of +1 unit.
  • D. A charge that depends on the semiconductor type.

17. When a P-N junction is reverse-biased, the capacitance depends on all of the following except:

  • A. The frequency.
  • B. The width of the depletion region.
  • C. The cross-sectional area of the junction.
  • D. The type of semiconductor material.

18. If the reverse bias exceeds the avalanche voltage in a P-N junction:

  • A. The junction will be destroyed.
  • B. The junction will insulate; no current will flow.
  • C. The junction will conduct current.
  • D. The capacitance will become extremely high.

19. Avalanche voltage is routinely exceeded when a P-N junction acts as:

  • A. Current rectifier.
  • B. Variable resistor.
  • C. Variable capacitor.
  • D. Voltage regulator.

20. An unimportant factor concerning the frequency at which a P-N junction will work effectively is:

  • A. The type of semiconductor material.
  • B. The cross-sectional area of the junction.
  • C. The reverse current.
  • D. The capacitance with reverse bias.

Complete List of Multiple Choice Questions from this Book

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