Digital Electronics MCQ & Objective Questions
Digital Electronics is a crucial subject for students preparing for school and competitive exams in India. Mastering this topic not only enhances your understanding of electronic systems but also significantly boosts your exam scores. Practicing MCQs and objective questions in Digital Electronics helps you identify important concepts and improves your problem-solving skills, making it an essential part of your exam preparation.
What You Will Practise Here
Fundamentals of digital logic design
Binary number systems and conversions
Logic gates and their truth tables
Combinational circuits and their applications
Sequential circuits and flip-flops
Boolean algebra and simplification techniques
Key definitions and important formulas
Exam Relevance
Digital Electronics is a significant topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions related to logic gates, number systems, and circuit design. Common patterns include multiple-choice questions that test both theoretical knowledge and practical applications, making it vital to be well-prepared with important Digital Electronics questions for exams.
Common Mistakes Students Make
Confusing between different types of logic gates and their functions.
Misunderstanding the conversion processes between binary and decimal systems.
Overlooking the importance of truth tables in combinational circuits.
Failing to apply Boolean algebra correctly in simplification problems.
Neglecting the timing diagrams in sequential circuits.
FAQs
Question: What are the key topics I should focus on in Digital Electronics for exams?Answer: Focus on logic gates, number systems, combinational and sequential circuits, and Boolean algebra.
Question: How can I improve my performance in Digital Electronics MCQs?Answer: Regular practice of MCQs and understanding the underlying concepts will greatly enhance your performance.
Start solving practice MCQs today to test your understanding and solidify your knowledge in Digital Electronics. Remember, consistent practice is the key to success in your exams!
Q. Which logic gate is used to implement the carry function in binary addition?
A.
AND
B.
OR
C.
XOR
D.
NOT
Show solution
Solution
The AND gate is used to generate the carry in binary addition.
Correct Answer:
A
— AND
Learn More →
Q. Which logic gate outputs 1 when at least one input is 1?
A.
AND
B.
OR
C.
NOT
D.
NAND
Show solution
Solution
An OR gate outputs 1 when at least one of its inputs is 1.
Correct Answer:
B
— OR
Learn More →
Q. Which logic gate outputs true if at least one input is true?
A.
AND
B.
OR
C.
NOT
D.
NAND
Show solution
Solution
An OR gate outputs true if at least one of its inputs is true.
Correct Answer:
B
— OR
Learn More →
Q. Which logic gate outputs true only when at least one input is true?
A.
AND
B.
OR
C.
NOT
D.
NAND
Show solution
Solution
An OR gate outputs true (1) when at least one of its inputs is true (1).
Correct Answer:
B
— OR
Learn More →
Q. Which logic gate outputs true only when both inputs are true?
A.
AND
B.
OR
C.
NOT
D.
XOR
Show solution
Solution
The AND gate outputs true only when both inputs are true.
Correct Answer:
A
— AND
Learn More →
Q. Which logic gate produces a true output only when both inputs are different?
A.
AND
B.
OR
C.
XOR
D.
NOR
Show solution
Solution
An XOR gate outputs true (1) only when the inputs are different.
Correct Answer:
C
— XOR
Learn More →
Q. Which number system is used in digital electronics for representing data?
A.
Decimal
B.
Binary
C.
Octal
D.
Hexadecimal
Show solution
Solution
The binary number system is used in digital electronics for representing data.
Correct Answer:
B
— Binary
Learn More →
Q. Which number system uses base 16?
A.
Binary
B.
Decimal
C.
Octal
D.
Hexadecimal
Show solution
Solution
The hexadecimal number system uses base 16.
Correct Answer:
D
— Hexadecimal
Learn More →
Q. Which of the following best describes a GAL?
A.
A type of FPGA
B.
A type of CPLD
C.
A programmable logic device with a fixed architecture
D.
A microcontroller
Show solution
Solution
A GAL (Generic Array Logic) is a programmable logic device with a fixed architecture, allowing for specific logic functions to be programmed.
Correct Answer:
C
— A programmable logic device with a fixed architecture
Learn More →
Q. Which of the following best describes a microcontroller?
A.
A microprocessor with additional peripherals integrated
B.
A type of memory used in computers
C.
A high-performance computing unit
D.
A standalone processing unit without any peripherals
Show solution
Solution
A microcontroller is essentially a microprocessor with additional peripherals integrated, designed for specific control applications.
Correct Answer:
A
— A microprocessor with additional peripherals integrated
Learn More →
Q. Which of the following binary numbers is the largest?
A.
1010
B.
1100
C.
1110
D.
1001
Show solution
Solution
1110 is the largest binary number among the options.
Correct Answer:
C
— 1110
Learn More →
Q. Which of the following circuits can be used to implement a binary counter?
A.
Decoder
B.
Multiplexer
C.
Flip-flop
D.
Shift register
Show solution
Solution
Flip-flops are commonly used to implement binary counters, as they can store and toggle states.
Correct Answer:
C
— Flip-flop
Learn More →
Q. Which of the following circuits can be used to implement a full adder?
A.
AND, OR, NOT gates
B.
NAND gates only
C.
XOR gates only
D.
OR gates only
Show solution
Solution
A full adder can be implemented using AND, OR, and NOT gates.
Correct Answer:
A
— AND, OR, NOT gates
Learn More →
Q. Which of the following configurations can a 555 timer be used in?
A.
Astable
B.
Monostable
C.
Bistable
D.
All of the above
Show solution
Solution
A 555 timer can be configured in astable, monostable, and bistable modes.
Correct Answer:
D
— All of the above
Learn More →
Q. Which of the following configurations can a 555 timer NOT be used in?
A.
Monostable
B.
Astable
C.
Bistable
D.
Quadrastable
Show solution
Solution
The 555 timer can be used in monostable, astable, and bistable configurations, but not quadrastable.
Correct Answer:
D
— Quadrastable
Learn More →
Q. Which of the following counters can count both up and down?
A.
Decade counter
B.
Up counter
C.
Down counter
D.
Up/Down counter
Show solution
Solution
An Up/Down counter can count in both directions, either incrementing or decrementing the count.
Correct Answer:
D
— Up/Down counter
Learn More →
Q. Which of the following describes a GAL?
A.
Generic Array Logic
B.
General Array Logic
C.
Graphical Array Logic
D.
Global Array Logic
Show solution
Solution
GAL stands for Generic Array Logic, which is a type of programmable logic device that allows for the implementation of combinational logic.
Correct Answer:
A
— Generic Array Logic
Learn More →
Q. Which of the following describes a SPDT switch?
A.
Single Pole Double Throw
B.
Single Pole Double Terminal
C.
Single Phase Double Throw
D.
Single Phase Double Terminal
Show solution
Solution
SPDT stands for Single Pole Double Throw, meaning it can connect one input to one of two outputs.
Correct Answer:
A
— Single Pole Double Throw
Learn More →
Q. Which of the following describes a zero-crossing detector?
A.
A device that measures amplitude
B.
A device that detects frequency
C.
A device that detects when a signal crosses zero voltage
D.
A device that amplifies signals
Show solution
Solution
A zero-crossing detector identifies points where the signal crosses the zero voltage level, which is useful for timing and synchronization.
Correct Answer:
C
— A device that detects when a signal crosses zero voltage
Learn More →
Q. Which of the following describes an analog signal?
A.
Discrete values
B.
Continuous values
C.
Binary values
D.
Digital values
Show solution
Solution
An analog signal is characterized by continuous values that can represent a range of information.
Correct Answer:
B
— Continuous values
Learn More →
Q. Which of the following describes the Nyquist theorem?
A.
Signals can be reconstructed if sampled at twice the highest frequency
B.
Signals can be amplified without distortion
C.
Signals can be compressed without loss
D.
Signals can be filtered without delay
Show solution
Solution
The Nyquist theorem states that a signal can be accurately reconstructed if it is sampled at a rate greater than twice its highest frequency.
Correct Answer:
A
— Signals can be reconstructed if sampled at twice the highest frequency
Learn More →
Q. Which of the following devices is commonly used in MSI logic circuits for data routing?
A.
Flip-flop
B.
Counter
C.
Multiplexer
D.
Register
Show solution
Solution
A multiplexer is commonly used in MSI logic circuits for routing data from multiple inputs to a single output.
Correct Answer:
C
— Multiplexer
Learn More →
Q. Which of the following devices is NOT typically classified as MSI?
A.
Binary counter
B.
Shift register
C.
Full adder
D.
Single transistor
Show solution
Solution
A single transistor is not classified as MSI; it is a basic electronic component, while the others are MSI devices.
Correct Answer:
D
— Single transistor
Learn More →
Q. Which of the following expressions is equivalent to NOT (A OR B)?
A.
NOT A AND NOT B
B.
NOT A OR NOT B
C.
A AND B
D.
A OR B
Show solution
Solution
According to De Morgan's Theorem, NOT (A OR B) is equivalent to NOT A AND NOT B.
Correct Answer:
A
— NOT A AND NOT B
Learn More →
Q. Which of the following expressions represents the output of an Ex-OR gate?
A.
A AND B
B.
A OR B
C.
A XOR B
D.
NOT A AND NOT B
Show solution
Solution
The Ex-OR gate is also known as the XOR gate, which outputs true when inputs differ.
Correct Answer:
C
— A XOR B
Learn More →
Q. Which of the following file extensions typically indicates a text file?
A.
.exe
B.
.txt
C.
.jpg
D.
.mp3
Show solution
Solution
.txt is the file extension for plain text files.
Correct Answer:
B
— .txt
Learn More →
Q. Which of the following file formats is typically used for images?
A.
JPEG
B.
HTML
C.
CSS
D.
XML
Show solution
Solution
JPEG (Joint Photographic Experts Group) is a commonly used method of lossy compression for digital images.
Correct Answer:
A
— JPEG
Learn More →
Q. Which of the following gates is known as an inverter?
A.
AND
B.
OR
C.
NOT
D.
NAND
Show solution
Solution
A NOT gate is known as an inverter because it inverts the input signal.
Correct Answer:
C
— NOT
Learn More →
Q. Which of the following interrupts has the highest priority in the 8051 microcontroller?
A.
External Interrupt 0
B.
Timer 0 Interrupt
C.
External Interrupt 1
D.
Timer 1 Interrupt
Show solution
Solution
External Interrupt 0 has the highest priority in the 8051 microcontroller.
Correct Answer:
A
— External Interrupt 0
Learn More →
Q. Which of the following is a benefit of using digital signatures?
A.
Increased file size
B.
Enhanced security and authenticity
C.
Slower processing
D.
Higher costs
Show solution
Solution
Digital signatures provide enhanced security and authenticity by ensuring that the document has not been altered and verifying the identity of the signer.
Correct Answer:
B
— Enhanced security and authenticity
Learn More →
Showing 361 to 390 of 486 (17 Pages)
