MCQs in Semiconductors

Multiple Choice Questions in Semiconductors from the book Electronic Principles by Albert Malvino. Make sure to familiarize each and every questions

MCQs in Semiconductors
This is the Multiple Choice Questions in Chapter 2: Semiconductors from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

  • MCQs in Conductors
  • MCQs in Semiconductors
  • MCQs in Silicon Crystal
  • MCQs in Intrinsic Semiconductors
  • MCQs in Two Types of Flow
  • MCQs in Doping Semiconductors
  • MCQs in Two types of Extrinsic Semiconductors
  • MCQs in the Unbiased Diode
  • MCQs in Energy Levels
  • MCQs in Reversed-Biased Diode

Begin and Good luck!

Choose the letter of the best answer in each questions.

1. The nucleus of a copper atom contains how many protons?

  • a. 1
  • b. 4
  • c. 18
  • d. 29

2. The net charge of a neutral copper atom is

  • a. 0
  • b. +1
  • c. -1
  • d. +4

3. Assume the valence electron is removed from a copper atom. The net charge of the atom becomes

  • a. 0
  • b. + 1
  • c. -1
  • d. +4

4. The valence electron of a copper atom experiences what kind of attraction toward the nucleus?

  • a. None
  • b. Weak
  • c. Strong
  • d. Impossible to say

5. How many valence electrons does a silicon atom have?

  • a. 0
  • b. 1
  • c. 2
  • d. 4

6. Which is the most widely used semiconductor?

  • a. Copper
  • b. Germanium
  • c. Silicon
  • d. None of the above

7. How many protons does the nucleus of a silicon atom contain?

  • a. 4
  • b. 14
  • c. 29
  • d. 32

8. Silicon atoms combine into an orderly pattern called a

  • a. Covalent bond
  • b. Crystal
  • c. Semiconductor
  • d. Valence orbit

9. 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 electrons

10. Each valence electron in an intrinsic semiconductor establishes a

  • a. Covalent bond
  • b. Free electron
  • c. Hole
  • d. Recombination

11. The merging of a free electron and a hole is called

  • a. Covalent bonding
  • b. Lifetime
  • c. Recombination
  • d. Thermal energy

12. At room temperature an intrinsic silicon crystal acts approximately like

  • a. A battery
  • b. A conductor
  • c. An insulator
  • d. A piece of copper wire

13. The amount of time between the creation of a hole and its disappearance is called

  • a. Doping
  • b. Lifetime
  • c. Recombination
  • d. Valence

14. The valence electron of a conductor is also called a

  • a. Bound electron
  • b. Free electron
  • c. Nucleus
  • d. Proton

15. A conductor has how many types of flow?

  • a. 1
  • b, 2
  • c. 3
  • d. 4

16. A semiconductor has how many types of flow?

  • a. 1
  • b. 2
  • c. 3
  • d. 4

17. When a voltage is applied to a semiconductor, holes will flow

  • a. Away from the negative potential
  • b. Toward the positive potential
  • c. In the external circuit
  • d. None of the above

18. A conductor has how many holes?

  • a. Many
  • b. None
  • c. Only those produced by thermal energy
  • d. The same number as free electrons

19. In an intrinsic semiconductor, the number of free electrons

  • a. Equals the number of holes
  • b. Is greater than the number of holes
  • c. Is less than the number of holes
  • d. None of the above

20. Absolute zero temperature equals

  • a. -273 degrees C
  • b. 0 degrees C
  • c. 25 degrees C
  • d. 50 degrees C

21. At absolute zero temperature an intrinsic semiconductor has

  • a. A few free electrons
  • b. Many holes
  • c. Many free electrons
  • d. No holes or free electrons

22. At room temperature an intrinsic semiconductor has

  • a. A few free electrons and holes
  • b. Many holes
  • c. Many free electrons
  • d. No holes

23. The number of free electrons and holes in an intrinsic semiconductor increases when the temperature

  • a. Decreases
  • b. Increases
  • c. Stays the same
  • d. None of the above

24. The flow of valence electrons to the left means that holes are flowing to the

  • a. Left
  • b. Right
  • c. Either way
  • d. None of the above

25. Holes act like

  • a. Atoms
  • b. Crystals
  • c. Negative charges
  • d. Positive charges

26. Trivalent atoms have how many valence electrons?

  • a. 1
  • b. 3
  • c. 4
  • d. 5

27. A donor atom has how many valence electrons?

  • a. 1
  • b. 3
  • c. 4
  • d. 5

28. If you wanted to produce a p-type semiconductor, which of these would you use?

  • a. Acceptor atoms
  • b. Donor atoms
  • c. Pentavalent impurity
  • d. Silicon

29. Holes are the minority carriers in which type of semiconductor?

  • a. Extrinsic
  • b. Intrinsic
  • c. n-type
  • d. p-type

30. How many free electrons does a p-type semiconductor contain?

  • a. Many
  • b. None
  • c. Only those produced by thermal energy
  • d. Same number as holes

31. Silver is the best conductor. How many valence electrons do you think it has?

  • a. 1
  • b. 4
  • c. 18
  • d. 29

32. Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. If the temperature changes to 75'C, how many holes are there?

  • a. Fewer than 1 billion
  • b. 1 billion
  • c. More than 1 billion
  • d. Impossible to say

33. An external voltage source is applied to a p-type semiconductor. If the left end of the crystal is positive, which way do the majority carriers flow?

  • a. Left
  • b. Right
  • c. Neither
  • d. Impossible to say

34. Which of the following doesn't fit in the group?

  • a. Conductor
  • b. Semiconductor
  • c. Four valence electrons
  • d. Crystal structure

35. Which of the following is approximately equal to room temperature?

  • a. 0 degrees C
  • b. 25 degrees C
  • c. 50 degrees C
  • d. 75degrees C

36. How many electrons are there in the valence orbit of a silicon atom within a crystal?

  • a. 1
  • b. 4
  • c. 8
  • d. 14

37. Positive ions are atoms that have

  • a. Gained a proton
  • b. Lost a proton
  • c. Gained an electron
  • d. Lost an electron

38. Which of the following describes an n-type semiconductor?

  • a. Neutral
  • b. Positively charged
  • c. Negatively charged
  • d. Has many holes

39. A p-type semiconductor contains holes and

  • a. Positive ions
  • b. Negative ions
  • c. Pentavalent atoms
  • d. Donor atoms

40. Which of the following describes a p-type semiconductor?

  • a. Neutral
  • b. Positively charged
  • c. Negatively charged
  • d. Has many free electrons

41. Which of the following cannot move?

  • a. Holes
  • b. Free electrons
  • C. Ions
  • d. Majority carriers

42. What causes the depletion layer?

  • a. Doping
  • b. Recombination
  • c. Barrier potential
  • d. Ions

43. What is the barrier potential of a silicon diode at room temperature?

  • a. 0.3 V
  • b. 0.7 V
  • C. 1 V
  • d. 2 mV per degree Celsius

44. To produce a large forward current in a silicon diode, the applied voltage must be greater than

a. 0

b. 0.3 V

c. 0.7 V

d. 1 V

45. In a silicon diode the reverse current is usually

  • a. Very small
  • b. Very large
  • c. Zero
  • d. In the breakdown region

46. Surface-leakage current is part of the

  • a. Forward current
  • b. Forward breakdown
  • c. Reverse current
  • d. Reverse breakdown

47. The voltage where avalanche occurs is called the

  • a. Barrier potential
  • b. Depletion layer
  • c. Knee voltage
  • d. Breakdown voltage

48. Diffusion of free electrons across the junction of an unbiased diode produces

  • a. Forward bias
  • b. Reverse bias
  • c. Breakdown
  • d. The depletion layer

49. When the reverse voltage increases from 5 to 10 V, the depletion layer

  • a. Becomes smaller
  • b. Becomes larger
  • c. Is unaffected
  • d. Breaks down
  • d. All of the above

50. When a diode is forward biased, the recombination of free electrons and holes may produce

  • a. Heat
  • b. Light
  • c. Radiation
  • d. All of the above

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino


Labels:

Post a Comment

Contact Form

Name

Email *

Message *

Powered by Blogger.
Javascript DisablePlease Enable Javascript To See All Widget