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 flip-flop can be used to create a shift register?
A.
D Flip-Flop
B.
T Flip-Flop
C.
JK Flip-Flop
D.
SR Flip-Flop
Show solution
Solution
D Flip-Flops are commonly used to create shift registers, as they can store and shift data serially.
Correct Answer:
A
— D Flip-Flop
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Q. Which flip-flop can be used to divide the frequency of a clock signal by 2?
A.
D Flip-Flop
B.
T Flip-Flop
C.
JK Flip-Flop
D.
SR Flip-Flop
Show solution
Solution
The T Flip-Flop toggles its output on each clock pulse, effectively dividing the input frequency by 2.
Correct Answer:
B
— T Flip-Flop
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Q. Which flip-flop is commonly used for frequency division?
A.
D Flip-Flop
B.
T Flip-Flop
C.
JK Flip-Flop
D.
SR Flip-Flop
Show solution
Solution
The T Flip-Flop is commonly used for frequency division because it toggles its output on each clock pulse.
Correct Answer:
B
— T Flip-Flop
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Q. Which flip-flop is known for its ability to set and reset based on two inputs?
A.
D Flip-Flop
B.
T Flip-Flop
C.
JK Flip-Flop
D.
SR Flip-Flop
Show solution
Solution
The SR Flip-Flop has two inputs, Set (S) and Reset (R), allowing it to control the output state directly.
Correct Answer:
D
— SR Flip-Flop
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Q. Which flip-flop is known for its ability to toggle based on a single input?
A.
D Flip-Flop
B.
T Flip-Flop
C.
JK Flip-Flop
D.
SR Flip-Flop
Show solution
Solution
The T Flip-Flop is known for its ability to toggle its output state based on a single input signal.
Correct Answer:
B
— T Flip-Flop
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Q. Which gate can be used to create a parity checker?
A.
AND
B.
OR
C.
XOR
D.
NOT
Show solution
Solution
An XOR gate can be used to create a parity checker.
Correct Answer:
C
— XOR
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Q. Which gate is equivalent to an OR gate followed by a NOT gate?
A.
AND
B.
NAND
C.
NOR
D.
XOR
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Solution
A NOR gate is equivalent to an OR gate followed by a NOT gate.
Correct Answer:
C
— NOR
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Q. Which gate is known as an inverter?
A.
AND
B.
OR
C.
NOT
D.
XOR
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Solution
The NOT gate is known as an inverter because it inverts the input signal.
Correct Answer:
C
— NOT
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Q. Which gate is the opposite of an AND gate?
A.
OR
B.
NAND
C.
NOR
D.
XOR
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Solution
The NAND gate is the opposite of an AND gate, as it outputs 0 only when both inputs are 1.
Correct Answer:
B
— NAND
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Q. Which gate produces a true output only when both inputs are different?
A.
AND
B.
OR
C.
XOR
D.
NAND
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Solution
An XOR gate outputs true only when the inputs are different.
Correct Answer:
C
— XOR
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Q. Which instruction is used to clear a specific bit in the 8051 microcontroller?
A.
CLR
B.
CPL
C.
ANL
D.
ORL
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Solution
The CLR instruction is used to clear a specific bit in the 8051 microcontroller.
Correct Answer:
A
— CLR
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Q. Which instruction is used to clear a specific bit in the 8051?
A.
CLR
B.
CPL
C.
SETB
D.
ANL
Show solution
Solution
The 'CLR' instruction is used to clear a specific bit in the 8051 microcontroller.
Correct Answer:
A
— CLR
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Q. Which law states that A AND 1 = A?
A.
Identity Law
B.
Null Law
C.
Domination Law
D.
Idempotent Law
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Solution
This is known as the Identity Law in Boolean algebra.
Correct Answer:
A
— Identity Law
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Q. Which logic circuit can be used to implement a full adder?
A.
AND, OR, NOT
B.
NAND only
C.
XOR only
D.
OR only
Show solution
Solution
A full adder can be implemented using AND, OR, and NOT gates.
Correct Answer:
A
— AND, OR, NOT
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Q. Which logic family has the fastest propagation delay?
A.
TTL
B.
CMOS
C.
ECL
D.
BiCMOS
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Solution
ECL (Emitter-Coupled Logic) has the fastest propagation delay among common logic families.
Correct Answer:
C
— ECL
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Q. Which logic family has the highest noise margin?
A.
TTL
B.
CMOS
C.
ECL
D.
BiCMOS
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Solution
CMOS logic families typically have the highest noise margin, making them more robust against noise.
Correct Answer:
B
— CMOS
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Q. Which logic family is best suited for battery-operated devices?
A.
TTL
B.
CMOS
C.
ECL
D.
BiCMOS
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Solution
CMOS is best suited for battery-operated devices due to its low power consumption.
Correct Answer:
B
— CMOS
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Q. Which logic family is best suited for high-speed applications?
A.
TTL
B.
CMOS
C.
ECL
D.
DIP
Show solution
Solution
ECL (Emitter-Coupled Logic) is best suited for high-speed applications due to its fast switching capabilities.
Correct Answer:
C
— ECL
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Q. Which logic family is known for its high noise immunity?
A.
TTL
B.
CMOS
C.
ECL
D.
BiCMOS
Show solution
Solution
CMOS logic families are known for their high noise immunity due to their high input impedance.
Correct Answer:
B
— CMOS
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Q. Which logic family is known for its high-speed operation?
A.
CMOS
B.
TTL
C.
ECL
D.
BiCMOS
Show solution
Solution
ECL (Emitter Coupled Logic) is known for its high-speed operation, making it suitable for fast applications.
Correct Answer:
C
— ECL
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Q. Which logic family is known for its low power consumption?
A.
CMOS
B.
TTL
C.
ECL
D.
BiCMOS
Show solution
Solution
CMOS (Complementary Metal-Oxide-Semiconductor) logic families are recognized for their low power consumption, especially in static conditions.
Correct Answer:
A
— CMOS
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Q. Which logic family is most susceptible to noise?
A.
TTL
B.
CMOS
C.
ECL
D.
DIP
Show solution
Solution
CMOS logic families are more susceptible to noise compared to TTL due to their high input impedance.
Correct Answer:
B
— CMOS
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Q. Which logic family is typically used in high-speed applications?
A.
TTL
B.
CMOS
C.
ECL
D.
DIP
Show solution
Solution
ECL (Emitter-Coupled Logic) is favored in high-speed applications due to its fast switching capabilities.
Correct Answer:
C
— ECL
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Q. Which logic family typically has the highest noise margin?
A.
TTL
B.
CMOS
C.
ECL
D.
BiCMOS
Show solution
Solution
CMOS logic families generally have a higher noise margin compared to TTL and ECL, making them more robust in noisy environments.
Correct Answer:
B
— CMOS
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Q. Which logic function can be implemented using an MSI adder?
A.
AND
B.
OR
C.
Addition
D.
Subtraction
Show solution
Solution
An MSI adder is specifically designed to perform the addition of binary numbers.
Correct Answer:
C
— Addition
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Q. Which logic function can be implemented using an MSI circuit?
A.
Only AND functions
B.
Only OR functions
C.
Any combinational logic function
D.
Only sequential logic functions
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Solution
MSI circuits can implement any combinational logic function, including AND, OR, and NOT functions.
Correct Answer:
C
— Any combinational logic function
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Q. Which logic gate is commonly used in the design of shift registers?
A.
AND gate
B.
OR gate
C.
NOT gate
D.
D flip-flop
Show solution
Solution
D flip-flops are commonly used in the design of shift registers to store each bit.
Correct Answer:
D
— D flip-flop
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Q. Which logic gate is commonly used to implement a multiplexer?
A.
AND gate
B.
OR gate
C.
NOT gate
D.
NAND gate
Show solution
Solution
Multiplexers are commonly implemented using a combination of AND and OR gates.
Correct Answer:
B
— OR gate
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Q. Which logic gate is equivalent to an inverter followed by an AND gate?
A.
NAND gate
B.
NOR gate
C.
AND gate
D.
OR gate
Show solution
Solution
An inverter followed by an AND gate is equivalent to a NAND gate.
Correct Answer:
A
— NAND gate
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Q. Which logic gate is represented by the expression A + B?
A.
AND
B.
OR
C.
NOT
D.
XOR
Show solution
Solution
The expression A + B represents an OR gate.
Correct Answer:
B
— OR
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