 # MCQ in Solid State Devices Part 1 | ECE Board Exam

(Last Updated On: August 9, 2018)

This is the Multiples Choice Questions Part 1 of the Series in Solid State Devices/Circuits as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

### MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQs in Semiconductor Fundamentals
• MCQs in Transistor Components
• MCQs in Circuit Analysis and Design
• MCQs in Special Services (Photo Electric, Photo voltaic)

### Start Practice Exam Test Questions Part 1 of the Series

Choose the letter of the best answer in each questions.

1. How many electrons are there in the fourth orbit of a copper atom?

A. 1

B. 2

C. 3

D. 4

Solution:

2. The maximum permissible number of electrons in the third orbit is

A. 18

B. 8

C. 32

D. 2

Solution:

3. Varactor diodes are commonly used

A. As voltage controlled capacitance

B. As a constant current source

C. As voltage multiplier

D. As a constant voltage source

Solution:

4. The reason why electrons are not pulled into the nucleus of an atom.

A. Because of the centrifugal or outward force created by their orbital motion.

B. Because of the force of attraction between them and the nucleus is weak.

C. Because they are not being attracted by the positive nucleus.

D. Because of the strong bonding between them that resists any force pulling them towards the nucleus.

Solution:

5. The electrons in the largest orbit travel ________ than the electrons in the smaller orbits.

A. More slowly

B. Faster

C. In the same velocity

D. A little bit slower

Solution:

6. A transistor configuration with the lowest current gain.

A. Common base

B. Common emitter

C. Common collector

D. Emitter-follower

Solution:

7. A semiconductor in its purest form is called

A. Pure semiconductor

B. Doped semiconductor

C. Intrinsic semiconductor

D. Extrinsic semiconductor

Solution:

8. Valence orbit is the other form for

A. Outer orbit

B. 3rd orbit

C. 4th orbit

D. 2nd orbit

Solution:

9. K shell means

A. First orbit

B. 2nd orbit

C. 3rd orbit

D. 4th orbit

Solution:

10. For either germanium or silicon diodes, the barrier potential decreases _______ for each Celsius degree rise.

A. 1 mV

B. 3 mV

C. 4 mV

D. 2 mv

Solution:

11. A diode modeling circuit which considers the threshold voltage, average resistance and switch as the diode’s equivalent circuit.

A. Ideal model

B. Simplified model

C. Piecewise linear model

D. Real model

Solution:

12. There are two mechanisms by which holes and electrons move through a silicon crystal. They are

A. Covalent bond and recombination

B. Diffusion and drift

C. Free and charge particles

D. Forward and reverse bias

Solution:

13. A semiconductor is an element with a valence of

A. Four

B. Eight

C. Two

D. One

Solution:

14. What orbit controls the electrical property of the atom?

A. Valence orbit

B. First orbit

C. Fourth orbit

D. M shell

Solution:

15. ________ is a substance that contains atoms with several bands of electrons but with only one valence electron.

A. Insulator

B. Conductor

C. Semiconductor

D. Resistor

Solution:

16. Pure silicon crystal atoms contain how may valence electrons as a result of covalent bonding?

A. 1

B. 4

C. 8

D. 16

Solution:

17. The peak inverse voltage of a full wave center tapped rectifier circuit is equal to _______ of the input signal.

A. Thrice the peak

B. Twice the peak

C. One half

D. One third

Solution:

18. Diffusion or storage capacitance is the term used to refer to

A. The reverse bias capacitance of a diode

B. The forward bias capacitance of a diode

C. The breakdown capacitance of a zener diode

D. The effective capacitance of the rectifier

Solution:

19. What is considered as the key electrical conductivity?

A. The number of electrons in the valence orbit

B. The number of protons in the nucleus

C. The number of neutrons in the nucleus

D. The number of protons plus the number of electrons in the atom

Solution:

20. Each atom in the silicon crystal has how many electrons in its valence orbit?

A. 8

B. 32

C. 2

D. 4

Solution:

21. Lifetime is the amount of time between the creation and disappearance of a/an

A. Free electron

B. Proton

C. Ion

D. Neutron

Solution:

22. A silicon crystal is an intrinsic semiconductor

A. If every atom in the crystal is a silicon atom

B. If majority of the atoms in crystal is a silicon atom

C. If the crystal contains 14 silicon atoms

D. If the crystal is undoped

Solution:

23. At room temperature, a silicon crystal acts approximately like a/an

A. Insulator

B. Semiconductor

C. Conductor

D. Superconductor

Solution:

24. An extrinsic semiconductor is a

A. Doped semiconductor

B. Pure semiconductor

C. Good insulator

D. Good conductor

Solution:

25. What is associated with random motion due to thermal agitation in the movement of holes and electrons in a silicon crystal?

A. Drift

B. Diffusion

C. Doping

D. Recombination

Solution:

26. The peak inverse voltage of a half wave rectifier circuit is approximately equal to the ________ of the input signal.

A. Peak amplitude

B. Frequency

C. Voltage sinusoidal

D. Current

Solution:

27. Silicon that has been doped with a trivalent impurity is called a/an

A. P-type semiconductor

B. N-type semiconductor

C. Intrinsic semiconductor

D. Extrinsic semiconductor

Solution:

28. Silicon that has been doped with a pentavalent impurity is called a/an

A. N-type semiconductor

B. P-type semiconductor

C. Intrinsic semiconductor

D. Extrinsic semiconductor

Solution:

29. What is another name for a pn crystal

A. Junction diode

B. PN junction

C. Diode

D. Lattice

Solution:

30. An acceptor atom is also called

A. Pentavalent atom

B. Trivalent atom

C. Minority carrier

D. Majority carrier

Solution:

31. Which is a donor atom?

A. Trivalent atom

B. Aluminum

C. Boron

D. Pentavalent atom

Solution:

32. In an n-type semiconductor, free electrons are called

A. Minority carriers

B. Valence electrons

C. Majority carriers

D. Charge carriers

Solution:

33. in an n-type semiconductor, holes are called

A. minority carriers

B. majority carriers

C. protons

D. charge carriers

Solution:

34. What is the barrier potential of germanium at 25˚C

A. 0.7 V

B. 0.3 V

C. 0.5 V

D. 0.4 V

Solution:

35. The barrier potential for a silicon diode at 25˚C is approximately

A. 0.4 V

B. 0.3 V

C. 0.7 V

D. 0.5 V

Solution:

36. Each pair of positive and negative ions at the junction is called a/an

A. Anion

B. Positron

C. Cation

D. Dipole

Solution:

37. When temperature increases, barrier potential _________.

A. Remains the same

B. Decreases

C. Increases

D. Either increases or decreases depending on the semiconductor material used

Solution:

38. Avalanche effects occurs at

A. Higher reverse voltages

B. Lower reverse voltages

C. Higher forward voltages

D. Lower forward voltages

Solution:

39. The creation of free electrons through zener effect is also known as

A. Avalanche emission

B. Thermionic emission

C. Low-field emission

D. High-field emission

Solution:

40. Zener effect only depends on the

A. High-speed minority carriers

B. High-speed majority carriers

C. Intensity of the electric field

D. Intensity of the magnetic field

Solution:

41. What temperature is inside the diode, right at the junction of the p and n-type materials?

A. Junction temperature

B. Ambient temperature

C. Internal temperature

D. Absolute temperature

Solution:

42. What is the input control parameter of a FET?

A. Gate voltage

B. Source voltage

C. Drain voltage

D. Gate current

Solution:

43. One of the important diode parameters which gives the magnitude of current the diode candle without burning.

A. Reverse saturation current

B. Reverse current

C. Forward current

D. Forward breakdown current

Solution:

44. The maximum reverse voltage that can be applied before current surges is called

A. Reverse recovery time

B. Maximum junction voltage

C. Forward voltage

D. Reverse breakdown voltage

Solution:

45. What is the other name of Esaki diode?

A. Diac

B. Hot-carrier diode

C. Shockley diode

D. Tunnel diode

Solution:

46. The most important application of Schottky diodes is in

A. Digital computers

B. Power supplies

C. Amplifier circuits

D. Voltage regulators

Solution:

47. A diode is a nonlinear device because

A. It produces a nonlinear graph

B. Its current is not directly proportional to its voltage

C. It has a built-in barrier potential

D. It can rectify alternating current

Solution:

48. The sum of the resistance of the p-region and the n-region is called

A. Junction resistance

B. Extrinsic resistance

C. Intrinsic resistance

D. Bulk resistance

Solution:

49. What is the typical bulk resistance of rectifier diodes?

A. Less than 1Ω

B. Greater than 1Ω

C. Equal to 1Ω

D. It depends on the doping level

Solution:

50. The reverse bias diode capacitance is termed as

A. Transition region capacitance

B. Diffusion capacitance

C. Storage capacitance

D. Reverse capacitance

Solution:

### Questions and Answers in Solid State Devices

Following is the list of practice exam test questions in this brand new series:

MCQ in Solid State Devices
PART 1: MCQs from Number 1 – 50                        Answer key: PART 1
PART 2: MCQs from Number 51 – 100                   Answer key: PART 2
PART 3: MCQs from Number 101 – 150                 Answer key: PART 3
PART 4: MCQs from Number 151 – 200                 Answer key: PART 4
PART 5: MCQs from Number 201 – 250                 Answer key: PART 5
PART 6: MCQs from Number 251 – 300                 Answer key: PART 6
PART 7: MCQs from Number 301 – 350                 Answer key: included
PART 8: MCQs from Number 351 – 400                 Answer key: included
PART 9: MCQs from Number 401 – 450                 Answer key: included
PART 10: MCQs from Number 451 – 500                 Answer key: included

### Complete List of MCQ in Electronics Engineering per topic

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