Electronics Engineering Mastery Test 5: ECE Pre-Board

(Last Updated On: December 25, 2017)

Electronics Engineering Exam 5

This is 100 items Practice Examinations set 5 in Electronics Engineering composed of previous Board Exams Questions. Read each questions and choices carefully! Choose the best answer. In the actual board, you have to answer 100 items in Electronics Engineering within 5 hours. You have to get at least 70% to pass the subject. Electronics Engineering is 30% of the total 100% Board Rating along with Mathematics (20%), General Engineering and Applied Sciences (20%) and Electronics Systems and Technology (30%).

Start the Test Yourself Exam 5

Choose the letter of the best answer in each questions.

1. According to the classical Bohr model, the ________ is viewed as having a planetary-type structure.

  • A. atom
  • B. proton
  • C. electron
  • D. neutron
View Answer:

Answer: Option A

Solution:

2. An n-type semi-conductive material is created by adding impurity atoms that have ________ valence electrons.

  • A. 2
  • B. 4
  • C. 3
  • D. 5
View Answer:

Answer: Option D

Solution:

3. What composes an atom?

  • A. One nucleus and only one electron
  • B. Protons, electrons, and nucleus
  • C. One nucleus and only one proton
  • D. Electrons and protons only
View Answer:

Answer: Option B

Solution:

4. What is nucleus of an atom?

  • A. It is made up of protons and neutrons.
  • B. Only protons are there.
  • C. Protons and electrons are within the nucleus.
  • D. It is composed only of neutrons.
View Answer:

Answer: Option A

Solution:

5. What is the atomic number of silicon?

  • A. 29
  • B. 34
  • C. 14
  • D. 15
View Answer:

Answer: Option C

Solution:

6. What is the atomic number of germanium?

  • A. 29
  • B. 34
  • C. 32
  • D. 15
View Answer:

Answer: Option C

Solution:

7. What is the letter designation of the valence shell in a silicon atom?

  • A. M
  • B. N
  • C. O
  • D. L
View Answer:

Answer: Option A

Solution:

8. Where are valence electrons found?

  • A. In the closest orbit to the nucleus
  • B. In various orbits around the nucleus
  • C. In the most distant orbit from the nucleus
  • D. In the nucleus of an atom
View Answer:

Answer: Option C

Solution:

9. How is positive ion formed?

  • A. When a valence electron breaks away from the atom
  • B. When there are more holes than electrons in the outer orbit
  • C. When the two atoms bond together
  • D. When an atom gains an extra valence electron
View Answer:

Answer: Option A

Solution:

10. How is negative ion formed?

  • A. When a valence electron breaks away from the atom
  • B. When there are more holes than electrons in the outer orbit
  • C. When the two atoms bond together
  • D. When an atom gains an extra valence electron
View Answer:

Answer: Option D

Solution:

11. What is the most widely used semiconductor material in electronic devices?

  • A. Germanium
  • B. Silicon
  • C. Gallium
  • D. Arsenic
View Answer:

Answer: Option B

Solution:

12. What energy band in which free electrons exists?

  • A. Valence band
  • B. Conduction band
  • C. First band
  • D. Second band
View Answer:

Answer: Option B

Solution:

13. How are electron-hole pairs produced?

  • A. By recombination
  • B. By thermal energy
  • C. By ionization
  • D. By doping
View Answer:

Answer: Option B

Solution:

14. When an electron falls into a hole this is

  • A. recombination
  • B. ionization
  • C. avalanche breakdown
  • D. doping
View Answer:

Answer: Option A

Solution:

15. What hold together the atoms in a semiconductor crystal?

  • A. By covalent bonding
  • B. By forces of attraction
  • C. By the interaction of valence electrons
  • D. All of the choices
View Answer:

Answer: Option D

Solution:

16. In a silicon crystal, each atom has

  • A. four conduction electrons
  • B. eight valence electrons, four of its own and four shared
  • C. four valence electrons
  • D. no valence electrons
View Answer:

Answer: Option B

Solution:

17. What produces the current in a semiconductor?

  • A. The electrons only.
  • B. The holes only.
  • C. Negative ions only.
  • D. By both electrons and holes.
View Answer:

Answer: Option D

Solution:

18. In an intrinsic semiconductor,

  • A. the free electrons are thermally produced.
  • B. there are as many free electrons as there are holes.
  • C. there are no free electrons.
  • D. Both A and B above.
View Answer:

Answer: Option D

Solution:

19. What is the difference between semiconductor and an insulator?

  • A. The atomic structure.
  • B. The number of free electrons.
  • C. A wider energy gap between the valence band and the conduction band.
  • D. All of the choices.
View Answer:

Answer: Option D

Solution:

20. What is the process of adding impurity to an intrinsic semiconductor?

  • A. Doping
  • B. Recombination
  • C. Ionization
  • D. Annihilation
View Answer:

Answer: Option A

Solution:

21. What impurity is added to silicon to create a p-type semiconductor?

  • A. Trivalent
  • B. Pentavalent
  • C. Intrinsic
  • D. Extrinsic
View Answer:

Answer: Option A

Solution:

22. What is the purpose of a pentavalent impurity?

  • A. To reduce the conductivity of silicon
  • B. To increase the number of holes
  • C. To create minority carriers
  • D. To increase number of free electrons
View Answer:

Answer: Option D

Solution:

23. What are the majority carriers in an n-type semiconductor?

  • A. Valence electrons
  • B. Conduction electrons
  • C. Protons
  • D. Holes
View Answer:

Answer: Option B

Solution:

24. What are holes in n-type semiconductor?

  • A. Majority carriers that are thermally produced.
  • B. Minority carriers that are thermally produced.
  • C. Majority carriers that are produced by doping.
  • D. Minority carriers that are produced by doping.
View Answer:

Answer: Option B

Solution:

25. How is pn junction formed?

  • A. By the boundary of p-type and n-type material
  • B. By ionization
  • C. By collision of proton and neutron in the nucleus
  • D. By the recombination process
View Answer:

Answer: Option A

Solution:

Electronics Engineering Mastery Test 5: ECE Pre-Board
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