Digital Electronics Quizzes: Test Your Knowledge

Question 1

Which logic gate has an output that is TRUE only when both inputs are TRUE?

Accepted Answer

AND gate

Answer

OR gate

Answer

NOT gate

Answer

XOR gate

Question 2

A digital circuit whose output depends solely on the current inputs is known as a:

Accepted Answer

Combinational circuit

Answer

Sequential circuit

Answer

Memory circuit

Answer

Analog circuit

Question 3

According to the truth table, when is the output of a 2-input OR gate TRUE?

Accepted Answer

At least one input is TRUE

Answer

Both inputs are FALSE

Answer

Only one input is TRUE

Answer

Neither input is TRUE

Question 4

What is the primary function of a multiplexer?

Accepted Answer

Selecting one input signal from multiple options to pass to the output

Answer

Storing digital information

Answer

Generating a clock signal

Answer

Converting analog signals to digital signals

Question 5

Which characteristic describes a D flip-flop?

Accepted Answer

Data is stored on the rising edge of the clock

Answer

Data is stored on the falling edge of the clock

Answer

Data is stored when the clock is HIGH

Answer

Data is stored when the clock is LOW

Question 6

What is the main purpose of a binary counter?

Accepted Answer

Counting pulses in a binary sequence

Answer

Storing data in binary format

Answer

Converting analog signals to digital signals

Answer

Generating a clock signal

Question 7

Which of the following is not a fundamental logic gate?

Accepted Answer

NOR

Answer

AND

Answer

OR

Answer

NOT

Question 8

A combinational circuit is characterized by its output depending solely on:

Accepted Answer

Current inputs

Answer

Previous inputs

Answer

Feedback loops

Answer

Clock signal

Question 9

Which of the following is an example of a sequential circuit?

Accepted Answer

Flip-flop

Answer

Multiplexer

Answer

Decoder

Answer

Adder

Question 10

Which Boolean expression represents the functionality of a NAND gate?

Accepted Answer

A' . B'

Answer

A . B

Answer

A + B

Answer

A - B

Question 11

A Karnaugh map is primarily used for:

Accepted Answer

Simplifying Boolean expressions

Answer

Designing combinational circuits

Answer

Analyzing sequential circuits

Answer

Converting decimal numbers to binary

Question 12

A state machine diagram is used to:

Accepted Answer

Represent the behavior of sequential circuits

Answer

Design combinational circuits

Answer

Analyze Boolean expressions

Answer

Convert binary numbers to decimal

Question 13

A digital-to-analog converter (DAC) is used to:

Accepted Answer

Convert digital signals to analog signals

Answer

Convert analog signals to digital signals

Answer

Amplify digital signals

Answer

Filter analog signals

Question 14

The output of a JK flip-flop is 1 when:

Accepted Answer

J=1, K=1

Answer

J=0, K=0

Answer

J=1, K=0

Answer

J=0, K=1

Question 15

What is the purpose of a decoder in a digital circuit?

Accepted Answer

To generate control signals for other circuits

Answer

To convert binary code to decimal code

Answer

To convert decimal code to binary code

Answer

To amplify digital signals

Question 16

Which of the following number systems uses a base of 16?

Accepted Answer

Hexadecimal

Answer

Binary

Answer

Octal

Answer

Decimal

Question 17

What is the term for a circuit that stores data in a binary format?

Accepted Answer

Register

Answer

Counter

Answer

Flip-flop

Answer

Decoder

Question 18

Which of the following is NOT a fundamental logic gate?

Accepted Answer

ADD

Answer

AND

Answer

XOR

Answer

NOT

Question 19

Which of the following is the Boolean expression for the AND gate shown in the image?

Accepted Answer

A . B

Answer

A / B

Answer

A ^ B

Answer

A + B

Question 20

Which of the following is a primary advantage of using digital electronics in electronic systems?

Accepted Answer

Increased reliability due to the use of binary logic

Answer

Higher power consumption

Answer

Reduced cost

Answer

Larger physical size

Question 21

A logic circuit has the following Boolean expression: F = (A + B) . (C + D). How many 2-input logic gates are required to implement this circuit?

Accepted Answer

Two 2-input AND gates and one 2-input OR gate

Answer

Two 3-input OR gates and one 2-input AND gate

Answer

One 3-input AND gate and one 2-input OR gate

Answer

One 4-input AND gate

Question 22

Which number system is primarily used to represent binary data in digital electronics?

Accepted Answer

Binary

Answer

Hexadecimal

Answer

Octal

Answer

Decimal

Question 23

What is the primary purpose of a Karnaugh map in digital electronics?

Accepted Answer

To simplify Boolean expressions and minimize logic circuits

Answer

To analyze sequential circuits

Answer

To design logic circuits from scratch

Answer

To convert binary to decimal

Question 24

Identify the option that does not represent a type of combinational circuit:

Accepted Answer

Sequential circuit

Answer

Adder

Answer

Decoder

Answer

Comparator

Question 25

Which of the following is a basic logic gate?

Accepted Answer

NOT

Answer

Multiplexer

Answer

Flip-flop

Answer

Decoder

Question 26

The output of a combinational circuit relies solely on:

Accepted Answer

Present input values

Answer

Neither present nor past input values

Answer

Both present and past input values

Answer

Past input values

Question 27

In digital electronics, which number system is commonly employed?

Accepted Answer

Binary

Answer

Octal

Answer

Decimal

Answer

Hexadecimal

Question 28

What is a primary application of a Karnaugh map?

Accepted Answer

Simplifying Boolean expressions

Answer

Designing combinational circuits

Answer

Converting between number systems

Answer

Analyzing sequential circuits

Question 29

What is the main function of a demultiplexer?

Accepted Answer

Selecting one of multiple output lines based on a control signal

Answer

Combining multiple input lines into a single output line

Answer

Storing binary data

Question 30

Which type of integrated circuit (IC) is used for storing binary information?

Accepted Answer

Flip-flop

Answer

Logic gate

Answer

Demultiplexer

Answer

Multiplexer

Question 31

What is the process of converting a digital signal to an analog signal known as?

Accepted Answer

Digital-to-analog conversion (DAC)

Answer

Analog-to-digital conversion (ADC)

Answer

Pulse-width modulation (PWM)

Answer

Frequency modulation (FM)

Question 32

Which logic gate produces the inverse of its input?

Accepted Answer

NOT gate

Answer

NOR gate

Answer

AND gate

Answer

NAND gate

Question 33

Which type of circuit is characterized by its output depending solely on its current inputs, without being influenced by any previous inputs?

Accepted Answer

Combinational circuit

Answer

Asynchronous circuit

Answer

Sequential circuit

Answer

Synchronous circuit

Question 34

Which of the following number systems is used to represent numbers in digital electronics?

Accepted Answer

Binary

Answer

Decimal

Answer

Octal

Answer

Hexadecimal

Question 35

Which component in digital electronics is used to store data in binary form?

Accepted Answer

Register

Answer

Decoder

Answer

Multiplexer

Answer

Comparator

Question 36

Which logic gate produces a 'high' output when both its inputs are 'low'?

Accepted Answer

NAND gate

Answer

XOR gate

Answer

NOR gate

Answer

AND gate

Question 37

Which type of device is used to amplify analog signals?

Accepted Answer

Operational amplifier

Answer

Flip-flop

Answer

Multiplexer

Answer

Comparator

Question 38

Which of the following is a type of sequential circuit?

Accepted Answer

Flip-flop

Answer

Capacitor

Answer

Transistor

Answer

Resistor

Question 39

What is the function of a multiplexer in a digital circuit?

Accepted Answer

To select one of several input signals to pass to an output

Answer

To filter and amplify analog signals

Answer

To store and retrieve data

Question 40

Which of the following is a technique used in modern digital circuit design?

Accepted Answer

Hierarchical design

Answer

Random logic design

Answer

Ad hoc design

Question 41

What is the purpose of a Schmitt trigger in a digital circuit?

Accepted Answer

To eliminate noise and provide a clean digital signal

Answer

To generate and store digital data

Answer

To amplify and filter analog signals

Question 42

Which of the following is a characteristic of a synchronous sequential circuit?

Accepted Answer

All state changes occur at the same time, triggered by a common clock signal

Answer

State changes occur randomly and are not synchronized

Answer

The circuit operates at very high speeds

Question 43

What is the primary use of a ROM (Read-Only Memory) in digital systems?

Accepted Answer

To store permanent data that cannot be modified

Answer

To store temporary data that can be erased and rewritten

Answer

To perform logical operations

Answer

To convert digital signals to analog signals