This is the Multiples Choice Questions Part 1 of the Series in Computer Fundamentals 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.

### Multiple Choice Questions Topic Outline

- MCQs in Analog and Digital System
- MCQs in Binary Number System
- MCQs in Boolean Algebra
- MCQs in Mathematical Logic and Switching Networks
- MCQs in Basic digital Circuits (logic gates, flip-flops, multivibrators, etc)
- MCQs in Static and dynamic Memory Devices
- MCQs in Programming and Machine Languages
- MCQs in Information and Acquisition Processing
- MCQs in Analog / Digital Conversion
- MCQs in Computer Networking

### The Series

Following is the list of multiple choice questions in this brand new series:

**Computer Principles MCQs**

**MCQs from Number 51 – 100**Answer key:

**PART II**

**MCQs from Number 101 – 150**Answer key:

**PART III**

**MCQs from Number 151 – 200**Answer key:

**PART IV**

**MCQs from Number 201 – 250**Answer key:

**PART V**

**MCQs from Number 251 – 300**Answer key:

**PART VI**

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

1. Which of the following involves digital quantities?

- A. Ten position switch
- B. Current meter
- C. Temperature
- D. Radio volume control

2. Which of the following choices is NOT a characteristic of analog quantity?

- A. Variable amplitude
- B. One quantity is represented by another which is proportional to the first
- C. Is considered discrete
- D. They can vary over a continuous range of values

3. The decimal system is composed of _____ numerals or symbols.

- A. 2
- B. 10
- C. 8
- D. 16

4. Change in state is

- A. same state
- B. reset
- C. set
- D. toggle

5. What is the decimal equivalent of (1101011)2?

- A. 107
- B. 108
- C. 96
- D. 100

6. What is the next binary number following (10111)2 in the counting sequence?

- A. 11100
- B. 11001
- C. 10110
- D. 11000

7. What is the largest decimal value that can be represented using 12 bits?

- A. 144
- B. 2048
- C. 4095
- D. 4096

8. What is the largest number that can be represented using 8 bits?

- A. 11111111
- B. 10111011
- C. 10111111
- D. 11011111

9. A digital circuit is also referred to as a/an _____ circuit.

- A. arithmetic
- B. logic
- C. electrical
- D. sequential

10. CMOS means

- A. Complementary Main-Oxide Semiconductor
- B. Complementary Metal-Oxide Semiconductor
- C. Complements Main-Oxidation Semiconductor
- D. Correlation in Metal Oxidized Semiconductor

11. What is the smallest type of computer in terms of their physical size?

- A. Minicomputer
- B. Mainframe
- C. Maxicomputer
- D. Microcomputer

12. Equivalent of decimal value of 178 in straight binary code is _____ and in BCD is _____.

- A. 11000, 11111111
- B. 10111101, 100000
- C. 10110010, 101111000
- D. 111111, 1100000

13. If each digit of a decimal number is represented by its binary equivalent, the result is a code called

- A. Morse code
- B. Binary system
- C. Binary-coded decimal
- D. Straight binary coding

14. Convert (614)8 to decimal.

- A. 400
- B. 384
- C. 392
- D. 396

15. BCD code has always _____ bits per number.

- A. 2
- B. 4
- C. 8
- D. 16

16. Convert (B2F)16 to octal.

- A. 5547
- B. 5457
- C. 7547
- D. 11010

17. Convert 1000 1001 0111 (BCD) to its decimal equivalent.

- A. 798
- B. 457
- C. 897
- D. 101

18. Which of the following items below is NOT one of the three basic operations of Boolean algebra?

- A. Logical addition
- B. Logical complementation
- C. Logical subtraction
- D. Logical multiplication

19. How many bits are required to represent an eight digit decimal number in BCD?

- A. 256
- B. 4
- C. 255
- D. 32

20. The _____ belongs to a class of codes called the minimum-change codes, in which only one bit in the code group changes when going from one step to the next.

- A. Morse code
- B. BCD code
- C. Excess-3 code
- D. Gray code

21. The most widely used 7-bit alphanumeric code is the

- A. ASCII
- B. EBCDIC
- C. Straight binary code
- D. Gray code

22. What is the hex equivalent of an ASCII code which means “HELP”?

- A. 48 45 4C 50
- B. 4C 50 51 52
- C. 58 57 58 48
- D. 48 45 50 50

23. A _____ takes the complete decimal number and represents it in binary.

- A. BCD
- B. Gray code
- C. Excess-3 code
- D. Straight binary code

24. The number of input combinations will equal _____ for an N-input truth table.

- A. 2N-1
- B. N
- C. 2N
- D. N-1

25. The _____ operation result will be 1 if any one or more variables is a 1.

- A. NOT
- B. AND
- C. OR
- D. NOR

26. A circuit that operates in such a way that its output is high when all its inputs are high.

- A. OR
- B. NAND
- C. NOR
- D. AND

27. What is the only input combination that will produce a high at the output of a five-input AND gate?

- A. At least one low input
- B. At least one high input
- C. All inputs should be low
- D. All inputs should be high

28. The output of an inverter is connected to the input of a second inverter. Determine the output level of the second inverter.

- A. Output level is the complement of the input level
- B. Output level is the same as the input level
- C. High output is observed
- D. Undetermined state

29. Given: **x = A’BC (A+D)’**. Determine the output of the circuit x if A = 0, B = 1, C = 1

and D = 0.

- A. 0
- B. 1
- C. 2
- D. 10

30. With OR operation, 1 + 1 = _____

- A. 1
- B. 0
- C. 10
- D. 2

31. Use the expression for **x = D + [(A+B)C]’ · E **to determine the output of the circuit for the conditions A = B = E = 1, C = D = 0.

- A. 0
- B. 1
- C. 2
- D. 10

32. The Boolean expression for a six-input OR gate

- A. A + B + C
- B. A
**·**B**·**C**·**D**·**E**·**F - C. A + B + C + D + E + F
- D. U + V + W + X + Y + Z

33. What type of gate is equivalent to a NAND gate followed by an inverter?

- A. OR
- B. AND
- C. XOR
- D. NOR

34. Simplify the expression **y = AB’D + AB’D’.**

- A. AB
- B. D’
- C. BCD
- D. AB’

35. How many different ways can we implement the inversion operation in a logic circuit?

- A. One
- B. Two
- C. Three
- D. Four

36. In Boolean algebra, **B · B’ **=

- A. B
- B. B’
- C. 0
- D. 1

37. In Boolean algebra, **G + GF **=

- A. GF
- B. G
- C. F
- D. 1

38. In Boolean algebra, **X + 1** =

- A. X + 1
- B. X
- C. 0
- D. 1

39. A circuit with no memory characteristic and whose output depends only on the current value of its inputs.

- A. SLC
- B. Boolean circuits
- C. CLC
- D. Multiplexers

40. Determine the sum-of-product expression for a circuit with four inputs and an output that is HIGH only when A is low at the same time that exactly two inputs are low.

- A. A’B’C’D + A’B’CD’ + A’BC’D’
- B. A’B’C’ + C’D’
- C. A’B’C’ + A’C’D’ + A’B’D’
- D. 10

41. What graphical device is used to convert a truth table to its corresponding logic circuit in a simple and orderly process?

- A. Karnaugh map
- B. State table
- C. Truth table
- D. State diagram

42. What is the output of an EX – OR gate when a logic signal and its exact inverse are connected to its input?

- A. X’
- B. X
- C. 1
- D. 0

43. One of the standard levels of complexity of integrated circuits which contains 100,000 and more number of gates.

- A. SSI
- B. MSI
- C. VLSI
- D. ULSI

44. What is the most common type of digital IC package?

- A. DIP
- B. Metal type
- C. CMOS
- D. TTL

45. An acceptable voltage range of a logic 0 for TTL.

- A. 2 to 5 V
- B. 0 to 0.8 V
- C. 0 to 1.5 V
- D. 3.5 to 5 V

46. An acceptable voltage range of a logic 1 for TTL.

- A. 2 to 5 V
- B. 0 to 0.8 V
- C. 0 to 1.5 V
- D. 3.5 to 5 V

47. An acceptable voltage range of a logic 0 for CMOS operating at VDD = 5 V.

- A. 2 to 5 V
- B. 0 to 0.8 V
- C. 0 to 1.5 V
- D. 3.5 to 5 V

48. An acceptable voltage range of a logic 1 for CMOS operating at VDD = 5 V.

- A. 2 to 5 V
- B. 0 to 0.8 V
- C. 0 to 1.5 V
- D. 3.5 to 5 V

49. What happens when the input to a digital IC is left unconnected for TTL ICs?

- A. It acts like logic 1
- B. It becomes overheated
- C. It acts just like logic 0
- D. It eventually destroys itself.

50. An unconnected input is termed as _____.

- A. open
- B. close
- C. disconnected
- D. floating

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

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