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. What is the output of a NAND gate if both inputs are true?
A.
True
B.
False
C.
1
D.
0
Show solution
Solution
A NAND gate outputs false only when both inputs are true; otherwise, it outputs true.
Correct Answer:
B
— False
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Q. What is the output of a NAND gate when both inputs are low?
A.
0
B.
1
C.
Undefined
D.
Depends on the circuit
Show solution
Solution
A NAND gate outputs 1 when at least one input is low; thus, it outputs 1 when both inputs are low.
Correct Answer:
B
— 1
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Q. What is the output of a NOR gate if one input is 1?
A.
0
B.
1
C.
undefined
D.
error
Show solution
Solution
A NOR gate outputs 0 if at least one input is 1.
Correct Answer:
A
— 0
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Q. What is the output of a NOR gate when both inputs are true?
A.
True
B.
False
C.
Undefined
D.
High impedance
Show solution
Solution
A NOR gate outputs false (0) when any of its inputs are true (1).
Correct Answer:
B
— False
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Q. What is the output of a NOT gate if the input is 0?
A.
0
B.
1
C.
undefined
D.
error
Show solution
Solution
The output of a NOT gate is 1 when the input is 0.
Correct Answer:
B
— 1
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Q. What is the output of a NOT gate when the input is 1?
Show solution
Solution
A NOT gate inverts the input; thus, if the input is 1, the output is 0.
Correct Answer:
A
— 0
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Q. What is the output of a NOT gate when the input is false?
A.
True
B.
False
C.
1
D.
0
Show solution
Solution
A NOT gate inverts the input; if the input is false, the output is true.
Correct Answer:
A
— True
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Q. What is the output of a shift register after shifting a binary '1011' left by 1 position?
A.
0110
B.
1100
C.
1011
D.
10110
Show solution
Solution
Shifting '1011' left by 1 position results in '10110'.
Correct Answer:
D
— 10110
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Q. What is the output of an AND gate if both inputs are 1?
A.
0
B.
1
C.
undefined
D.
error
Show solution
Solution
An AND gate outputs 1 only when both inputs are 1.
Correct Answer:
B
— 1
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Q. What is the output of an AND gate if both inputs are true?
A.
True
B.
False
C.
Undefined
D.
None of the above
Show solution
Solution
An AND gate outputs true only when both inputs are true.
Correct Answer:
A
— True
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Q. What is the output of an AND gate when both inputs are high?
A.
0
B.
1
C.
Undefined
D.
Depends on the circuit
Show solution
Solution
An AND gate outputs 1 only when both inputs are high (1).
Correct Answer:
B
— 1
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Q. What is the output of an Ex-NOR gate when both inputs are 1?
A.
1
B.
0
C.
Undefined
D.
Both 0 and 1
Show solution
Solution
An Ex-NOR gate outputs 1 when both inputs are the same, so for A=1 and B=1, the output is 1.
Correct Answer:
A
— 1
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Q. What is the output of an Ex-NOR gate when both inputs are the same?
A.
0
B.
1
C.
Depends on the circuit
D.
Undefined
Show solution
Solution
An Ex-NOR gate outputs 1 when both inputs are the same.
Correct Answer:
B
— 1
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Q. What is the output of an Ex-OR gate for inputs A=1 and B=1?
A.
1
B.
0
C.
Undefined
D.
Both 0 and 1
Show solution
Solution
The Ex-OR gate outputs 0 when both inputs are the same, so for A=1 and B=1, the output is 0.
Correct Answer:
B
— 0
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Q. What is the output of an Ex-OR gate when both inputs are the same?
A.
1
B.
0
C.
Undefined
D.
Both 0 and 1
Show solution
Solution
An Ex-OR gate outputs 0 when both inputs are the same (either 0 or 1).
Correct Answer:
B
— 0
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Q. What is the output of an OR gate if both inputs are 0?
A.
0
B.
1
C.
undefined
D.
error
Show solution
Solution
The output of an OR gate is 0 if both inputs are 0.
Correct Answer:
A
— 0
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Q. What is the output of an OR gate if both inputs are false?
A.
True
B.
False
C.
1
D.
0
Show solution
Solution
An OR gate outputs false only when both inputs are false.
Correct Answer:
B
— False
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Q. What is the output of an XOR gate when both inputs are high?
A.
0
B.
1
C.
Undefined
D.
Depends on the circuit
Show solution
Solution
An XOR gate outputs 0 when both inputs are high.
Correct Answer:
A
— 0
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Q. What is the output of the expression A XOR A?
A.
0
B.
1
C.
A
D.
Undefined
Show solution
Solution
The output of A XOR A is always 0.
Correct Answer:
A
— 0
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Q. What is the output state of a D Flip-Flop when the D input is 0 at the clock edge?
A.
1
B.
0
C.
Toggle
D.
Indeterminate
Show solution
Solution
The output of a D Flip-Flop will be 0 when the D input is 0 at the clock edge.
Correct Answer:
B
— 0
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Q. What is the output state of a D flip-flop when the D input is low at the clock edge?
A.
High
B.
Low
C.
Toggle
D.
Undefined
Show solution
Solution
The output state of a D flip-flop will be low when the D input is low at the clock edge.
Correct Answer:
B
— Low
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Q. What is the primary advantage of CMOS logic over TTL logic?
A.
Higher speed
B.
Lower power consumption
C.
Greater noise immunity
D.
Simpler design
Show solution
Solution
CMOS logic consumes significantly less power than TTL logic, especially when in a static state.
Correct Answer:
B
— Lower power consumption
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Q. What is the primary advantage of CMOS logic over TTL?
A.
Higher speed
B.
Lower power consumption
C.
Greater noise immunity
D.
Simpler design
Show solution
Solution
CMOS logic consumes significantly less power than TTL logic, especially when in a static state.
Correct Answer:
B
— Lower power consumption
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Q. What is the primary advantage of using a PLD?
A.
Lower cost than fixed-function devices
B.
Higher performance than microcontrollers
C.
Flexibility to change logic functions after manufacturing
D.
Easier to design than ASICs
Show solution
Solution
The primary advantage of using a PLD is the flexibility to change logic functions after manufacturing, allowing for rapid prototyping.
Correct Answer:
C
— Flexibility to change logic functions after manufacturing
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Q. What is the primary advantage of using a synchronous counter?
A.
Simplicity in design
B.
Faster operation
C.
Lower power consumption
D.
Easier to implement
Show solution
Solution
Synchronous counters operate faster because all flip-flops are triggered simultaneously.
Correct Answer:
B
— Faster operation
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Q. What is the primary advantage of using MSI circuits?
A.
Lower power consumption
B.
Increased complexity
C.
Reduced size and cost
D.
Higher speed
Show solution
Solution
The primary advantage of MSI circuits is reduced size and cost due to the integration of multiple functions on a single chip.
Correct Answer:
C
— Reduced size and cost
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Q. What is the primary characteristic of TTL logic families?
A.
High speed and low power consumption
B.
Low speed and high power consumption
C.
High speed and moderate power consumption
D.
Low speed and low power consumption
Show solution
Solution
TTL (Transistor-Transistor Logic) is known for its high speed and moderate power consumption compared to other logic families.
Correct Answer:
C
— High speed and moderate power consumption
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Q. What is the primary difference between a CPLD and an FPGA?
A.
CPLDs are more complex than FPGAs
B.
FPGAs have more logic resources than CPLDs
C.
CPLDs are slower than FPGAs
D.
FPGAs are less flexible than CPLDs
Show solution
Solution
The primary difference is that FPGAs typically have more logic resources and are better suited for complex designs compared to CPLDs.
Correct Answer:
B
— FPGAs have more logic resources than CPLDs
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Q. What is the primary disadvantage of bipolar junction transistors (BJTs) compared to MOSFETs in integrated circuits?
A.
Higher power consumption
B.
Lower switching speed
C.
More complex fabrication
D.
Larger size
Show solution
Solution
BJTs generally consume more power than MOSFETs, making them less favorable for low-power applications in integrated circuits.
Correct Answer:
A
— Higher power consumption
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Q. What is the primary function of a 555 timer in monostable mode?
A.
Generate a continuous square wave
B.
Generate a single pulse of a specific duration
C.
Act as a voltage comparator
D.
Control the brightness of an LED
Show solution
Solution
In monostable mode, the 555 timer generates a single pulse of a specific duration when triggered.
Correct Answer:
B
— Generate a single pulse of a specific duration
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