Digital Electronics MCQ

Q1. Which of the following is a universal gate? 

a) AND

b) OR

c) XOR

d) NAND

Answer: (d) NAND (NOR is also a universal gate) 

 Q2. Which characteristic best describes an analog signal?

a) It is discrete in nature.

b) It has only two states (HIGH/LOW).

c) It is continuous and can take any value within a range.

d) It uses binary coding exclusively.

Answer: (c) It is continuous and can take any value within a range.

Q3. In digital electronics, a logic HIGH typically represents which binary value?

a) 0

b) -1

c) 1

d) 50% duty cycle

Answer: (c) 1

Q4. The number system with a base of 2 is called:

a) Decimal

b) Octal

c) Hexadecimal

d) Binary

Q5. A group of 8 bits is known as a:

a) Nibble

b) Word

c) Byte

d) Kilobyte

Answer: (c) Byte

Q6. Which of the following systems is immune to noise compared to others?

a) Analog systems

b) Digital systems

c) Hybrid systems

d) Linear systems

Answer: (b) Digital systems

Q7. Which basic logic gate implements the Boolean expression \(X=A+B\)?

 a) AND

b) OR

c) NOT

d) XOR

 Answer: (b) OR 

Q8. The output of an AND gate is HIGH (1) only when:

a) At least one input is HIGH.

b) All inputs are LOW.

c) All inputs are HIGH.

d) Inputs are different.