Circuit that performs logical operations

Digital Electronics MCQ

Digital Electronics MCQ Questions – Practice MCQs with Answers

Explore 30+ Digital Electronics MCQs with detailed answers designed to help students and professionals strengthen their understanding of fundamental digital concepts. These questions cover important topics such as logic gates, Boolean algebra, combinational circuits, sequential circuits, flip-flops, counters, registers, multiplexers, and more. Regular practice of these MCQs can improve problem-solving skills and prepare you for academic exams, competitive tests, interviews, quizzes, and certification assessments. Whether you are a beginner learning the basics or an advanced learner revising key concepts, this collection provides an effective way to test and enhance your Digital Electronics knowledge.

Q1. What is digital electronics?

Correct Answer: B

Digital electronics deals with digital signals (0 and 1) and logic circuits.

Q2. Which number system is used in digital electronics?

Correct Answer: B

Binary number system is used in digital electronics.

Q3. How many states does a digital signal have?

Correct Answer: B

Digital signals have two states: 0 and 1.

Q4. What is logic gate?

Correct Answer: B

Logic gates perform logical operations on binary inputs.

Q5. Which is NOT a basic logic gate?

Correct Answer: D

ADC is not a logic gate.

Q6. Which gate gives output 1 only when all inputs are 1?

Correct Answer: B

AND gate outputs 1 only when all inputs are 1.

Q7. Which gate gives output 1 when any input is 1?

Correct Answer: B

OR gate outputs 1 if any input is 1.

Q8. NOT gate is also called:

Correct Answer: A

NOT gate is called inverter.

Q9. What is NAND gate?

Correct Answer: A

NAND is NOT of AND gate.

Q10. What is NOR gate?

Correct Answer: A

NOR is NOT of OR gate.

Q11. Which gate is universal gate?

Correct Answer: C

NAND gate is a universal gate.

Q12. Which gate is also a universal gate?

Correct Answer: C

NOR gate is also universal.

Q13. What is XOR gate output when inputs are same?

Correct Answer: A

XOR outputs 0 for same inputs.

Q14. What is flip-flop?

Correct Answer: A

Flip-flop is a memory storage element.

Q15. Which flip-flop is used for memory storage?

Correct Answer: A

RS flip-flop stores binary data.

Q16. What is clock signal used for?

Correct Answer: B

Clock synchronizes digital circuits.

Q17. What is a register?

Correct Answer: A

Q18. How many bits in a nibble?

Correct Answer: B

Nibble = 4 bits.

Q19. How many bits in a byte?

Correct Answer: B

1 byte = 8 bits.

Q20. What is combinational circuit?

Correct Answer: B

Combinational circuits depend only on current inputs.

Q21. What is sequential circuit?

Correct Answer: B

Sequential circuits have memory.

Q22. Which is combinational circuit example?

Correct Answer: C

Adder is combinational circuit.

Q23. Which is sequential circuit example?

Correct Answer: C

Counter is sequential circuit.

Q24. What is multiplexer?

Correct Answer: B

MUX selects one input from many.

Q25. What is demultiplexer?

Correct Answer: B

DEMUX sends one input to many outputs.

Q26. What is encoder?

Correct Answer: B

Encoder converts inputs into binary code.

Q27. What is decoder?

Correct Answer: A

Decoder converts binary to output lines.

Q28. What is full adder?

Correct Answer: B

Full adder adds 3 bits (A, B, Carry-in).

Q29. What is half adder?

Correct Answer: B

Half adder adds two bits.

Q30. What is latch?

Correct Answer: A

Latch is basic memory element.

Q31. What is counter in digital electronics?

Correct Answer: B

Counter counts clock pulses.

Q32. What is shift register?

Correct Answer: A

Shift register shifts data serially.

Q33. Which gate is used in half adder sum?

Correct Answer: C

XOR gives sum in half adder.

Q34. Which gate is used for carry in half adder?

Correct Answer: A

AND gate gives carry output.

Q35. What is propagation delay?

Correct Answer: A

Propagation delay is time taken for output response.

Q36. What is tri-state buffer?

Correct Answer: C

Tri-state buffer has high impedance state.

Q37. What is binary code?

Correct Answer: B

Binary code uses 0 and 1.

Q38. What is logic family?

Correct Answer: A

Logic family is group of digital logic circuits.

Q39. Which is fastest logic family?

Correct Answer: C

ECL is fastest logic family.

Q40. What is IC in digital electronics?

Correct Answer: B

IC stands for Integrated Circuit.

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Digital Electronics MCQ