139 + Mcqs in Digital Concepts Page 1 McqOptions

1.	The range of voltages between V and V are ________.
A.	unknown
B.	unnecessary
C.	unacceptable
D.	between 2 V and 5 V
Answer» D. between 2 V and 5 V

Discussion

2.	A periodic digital waveform has a pulse width (t) of 6 ms and a period (T) of 18 ms. The duty cycle is ________.
A.	3.3%
B.	33.3%
C.	6%
D.	18%
Answer» C. 6%

Discussion

3.	What is the decimal value of 2?
A.	2
B.	4
C.	6
D.	8
Answer» E.

Discussion

4.	In a typical digital system, Logic 0 is 0V–0.8V, and Logic 1 is ________.
A.	2–5V
B.	2.5–5V
C.	3.0–5.5V
D.	3.5–5.5V
Answer» B. 2.5–5V

Discussion

5.	What is the decimal value of 2–1 ?
A.	0.5
B.	0.25
C.	0.05
D.	0.1
Answer» B. 0.25

Discussion

6.	A(n)________ is not a functional unit of a computer.
A.	input unit
B.	memory unit
C.	modem
D.	control unit
Answer» D. control unit

Discussion

7.	In ________ transmission, a single conductor is used.
A.	digital
B.	automatic
C.	serial
D.	binary
Answer» D. binary

Discussion

8.	In a binary system there are only two symbols.
A.	1
B.
Answer» B.

Discussion

9.	A logic circuit that can store one bit of information is a ________.
A.	flip-flop
B.	counter
C.	gate
D.	code converter
Answer» B. counter

Discussion

10.	A microcomputer is the smallest type of computer.
A.	1
B.
Answer» B.

Discussion

11.	PALs are relatively simple integrated circuit devices.
A.	1
B.
Answer» B.

Discussion

12.	Greater accuracy and precision are possible with digital techniques.
A.	1
B.
Answer» B.

Discussion

13.	The duty cycle of a square wave is ________.
A.	0.1
B.	0.25
C.	0.5
D.	1
Answer» D. 1

Discussion

14.	An inverter performs a NOT operation.
A.	1
B.
Answer» B.

Discussion

15.	The area represented by #4 in the given figure is the ________ level.
A.	HIGH
B.	LOW
C.	off
D.	unacceptable
Answer» E.

Discussion

16.	X-ray, MRI, and ultrasound systems in hospitals are examples of analog systems.
A.	1
B.
Answer» B.

Discussion

17.	A graph of phase vs. time is a timing diagram.
A.	1
B.
Answer» C.

Discussion

18.	The CPU contains all the circuitry for ________.
A.	storing data
B.	keeping track of time
C.	fetching and interpreting instructions
D.	Internet operations
Answer» D. Internet operations

Discussion

19.	The digit that changes most often when counting is called the ________.
A.	LSB
B.	LL Bean
C.	LED
D.	LCD
Answer» B. LL Bean

Discussion

20.	The control and arithmetic/logic units are often considered as one unit called the ________.
A.	central processing unit
B.	inputs and outputs
C.	microcomputer
D.	arithmetic/logic unit
Answer» B. inputs and outputs

Discussion

21.	A binary number can be converted to be viewed on a 7-segment display by a(n) ________.
A.	decoder
B.	encoder
C.	multiplexer
D.	magnitude comparator
Answer» B. encoder

Discussion

22.	It is possible to have an overlap between high and low levels in digital logic.
A.	1
B.
Answer» C.

Discussion

23.	With an OR gate, the output is HIGH only when both inputs are HIGH.
A.	1
B.
Answer» C.

Discussion

24.	The real world is mainly analog.
A.	1
B.
Answer» B.

Discussion

25.	The controls on an oscilloscope that will help obtain a stable display are in the ________.
A.	vertical section
B.	horizontal section
C.	trigger section
D.	display section
Answer» D. display section

Discussion

26.	Binary means having two states or values.
A.	1
B.
Answer» B.

Discussion

27.	Circuits that exhibit the property of memory normally revert to their original state when the input is removed.
A.	1
B.
Answer» C.

Discussion

28.	The rise-time of a pulse is normally measured between the ________.
A.	0 and 100% level
B.	10% and 90% level
C.	30% and 70% level
D.	50% level on the leading edge to the 50% level on the trailing edge
Answer» C. 30% and 70% level

Discussion

29.	The decimal system is composed of ________ symbols.
A.	2
B.	8
C.	10
D.	16
Answer» D. 16

Discussion

30.	The time interval on the leading edge of a pulse between 10% and 90% of the amplitude is the rise time.
A.	1
B.
Answer» B.

Discussion

31.	Using digital techniques of information storage is easy.
A.	1
B.
Answer» B.

Discussion

32.	Memory devices that use electronic latching circuits are called ________.
A.	RAM
B.	flip-flops
C.	magnetic tape
D.	DRAM
Answer» C. magnetic tape

Discussion

33.	________ is the highest-value seven-bit binary number.
A.	128
B.	127
C.	126
D.	125
Answer» C. 126

Discussion

34.	The LSB is always to the right of the MSB.
A.	1
B.
Answer» B.

Discussion

35.	To determine which of two binary numbers is larger, you could use a(n) ________.
A.	register
B.	adder
C.	encoder
D.	magnitude comparator
Answer» E.

Discussion

36.	Digital systems require that voltage levels change between high and low.
A.	1
B.
Answer» B.

Discussion

37.	The value of the data shown in the given figure is ________.
A.	between 0 and 1
B.	1011001
C.	5
D.	1001101
Answer» C. 5

Discussion

38.	A microprocessor that performs only specific, dedicated tasks is also called a ________.
A.	microcontroller
B.	calculator
C.	laptop microrocmputer
D.	workstation processor
Answer» B. calculator

Discussion

39.	One advantage of analog circuits over digital circuits is that it's easier to store data.
A.	1
B.
Answer» C.

Discussion

40.	The horizontal axis of an oscilloscope is normally calibrated in units of ________.
A.	voltage
B.	current
C.	time
D.	frequency
Answer» D. frequency

Discussion

41.	The CPU (Central Processing Unit) is composed of memory and outputs.
A.	1
B.
Answer» C.

Discussion

42.	If a HIGH logic level is assigned a binary zero (0), and a low level is assigned a binary one (1), the logic is called ________.
A.	negative logic
B.	positive logic
C.	invalid logic
D.	assertion-level logic
Answer» B. positive logic

Discussion

43.	Four bits equal one byte.
A.	1
B.
Answer» C.

Discussion

44.	In a positive logic system, the HIGH level is usually represented by ________.
A.	0 V
B.	+1 V
C.	+5 V
D.	+9 V
Answer» D. +9 V

Discussion

45.	The arithmetic/logic unit will send the results of its decisions to memory.
A.	1
B.
Answer» C.

Discussion

46.	Other ________ are often used to interpret or represent binary quantities for the convenience of the people who work with and use these digital systems.
A.	analog systems
B.	digital systems
C.	number systems
D.	binary systems
Answer» D. binary systems

Discussion

47.	In a negative logic system, a high is represented by 0.
A.	1
B.
Answer» B.

Discussion

48.	In ________ the quantities are not represented by continuously variable indicators.
A.	analog representation
B.	digital representation
C.	signal representation
D.	computer representation
Answer» C. signal representation

Discussion

49.	A set of instructions for a computer is called a(n) ________.
A.	instruction manual
B.	logic unit
C.	program
D.	diagram
Answer» D. diagram

Discussion

50.	Demultiplexing is a logic function that ________.
A.	determines which of several inputs is the greatest
B.	switches logic from one input to any of several output lines
C.	switches logic from several inputs onto one output line
D.	converts a code from one form to another
Answer» C. switches logic from several inputs onto one output line

Discussion

Explore topic-wise MCQs in Digital Electronics.

The range of voltages between V and V are ________.

A periodic digital waveform has a pulse width (t) of 6 ms and a period (T) of 18 ms. The duty cycle is ________.

What is the decimal value of 2?

In a typical digital system, Logic 0 is 0V–0.8V, and Logic 1 is ________.

What is the decimal value of 2–1 ?

A(n)________ is not a functional unit of a computer.

In ________ transmission, a single conductor is used.

In a binary system there are only two symbols.

A logic circuit that can store one bit of information is a ________.

A microcomputer is the smallest type of computer.

PALs are relatively simple integrated circuit devices.

Greater accuracy and precision are possible with digital techniques.

The duty cycle of a square wave is ________.

An inverter performs a NOT operation.

The area represented by #4 in the given figure is the ________ level.

X-ray, MRI, and ultrasound systems in hospitals are examples of analog systems.

A graph of phase vs. time is a timing diagram.

The CPU contains all the circuitry for ________.

The digit that changes most often when counting is called the ________.

The control and arithmetic/logic units are often considered as one unit called the ________.

A binary number can be converted to be viewed on a 7-segment display by a(n) ________.

It is possible to have an overlap between high and low levels in digital logic.

With an OR gate, the output is HIGH only when both inputs are HIGH.

The real world is mainly analog.

The controls on an oscilloscope that will help obtain a stable display are in the ________.

Binary means having two states or values.

Circuits that exhibit the property of memory normally revert to their original state when the input is removed.

The rise-time of a pulse is normally measured between the ________.

The decimal system is composed of ________ symbols.

The time interval on the leading edge of a pulse between 10% and 90% of the amplitude is the rise time.

Using digital techniques of information storage is easy.

Memory devices that use electronic latching circuits are called ________.

________ is the highest-value seven-bit binary number.

The LSB is always to the right of the MSB.

To determine which of two binary numbers is larger, you could use a(n) ________.

Digital systems require that voltage levels change between high and low.

The value of the data shown in the given figure is ________.

A microprocessor that performs only specific, dedicated tasks is also called a ________.

One advantage of analog circuits over digital circuits is that it's easier to store data.

The horizontal axis of an oscilloscope is normally calibrated in units of ________.

The CPU (Central Processing Unit) is composed of memory and outputs.

If a HIGH logic level is assigned a binary zero (0), and a low level is assigned a binary one (1), the logic is called ________.

Four bits equal one byte.

In a positive logic system, the HIGH level is usually represented by ________.

The arithmetic/logic unit will send the results of its decisions to memory.

Other ________ are often used to interpret or represent binary quantities for the convenience of the people who work with and use these digital systems.

In a negative logic system, a high is represented by 0.

In ________ the quantities are not represented by continuously variable indicators.

A set of instructions for a computer is called a(n) ________.

Demultiplexing is a logic function that ________.