**What is the basic unit of digital information?**

- a) Byte
- b) Bit
- c) Nibble
- d) Word

Answer: b) Bit

Explanation: A bit (binary digit) is the most fundamental unit of digital information, representing either a 0 or 1.

**Which logic gate performs the operation where the output is true only if all inputs are true?**

- a) OR gate
- b) NOR gate
- c) AND gate
- d) XOR gate

Answer: c) AND gate

Explanation: The AND gate outputs true (1) only when all of its inputs are true (1).

**What is the decimal equivalent of the binary number 1010?**

- a) 8
- b) 10
- c) 12
- d) 14

Answer: b) 10

Explanation: In binary, 1010 represents (1×8) + (0×4) + (1×2) + (0×1) = 8 + 0 + 2 + 0 = 10 in decimal.

**Which of the following is NOT a type of flip-flop?**

- a) D flip-flop
- b) T flip-flop
- c) K flip-flop
- d) JK flip-flop

Answer: c) K flip-flop

Explanation: Common types of flip-flops include D, T, SR, and JK. There is no standard “K flip-flop.”

**What does ROM stand for in digital electronics?**

- a) Random Operating Memory
- b) Read-Only Memory
- c) Rapid Output Module
- d) Reliable Oscillator Mechanism

Answer: b) Read-Only Memory

Explanation: ROM stands for Read-Only Memory, which is a type of non-volatile memory that stores data permanently.

**Which of the following is a universal gate?**

- a) OR gate
- b) AND gate
- c) NOT gate
- d) NAND gate

Answer: d) NAND gate

Explanation: A NAND gate is considered universal because any other logic gate can be constructed using only NAND gates.

**In Boolean algebra, what does the symbol “+” represent?**

- a) Addition
- b) Multiplication
- c) OR operation
- d) XOR operation

Answer: c) OR operation

Explanation: In Boolean algebra, the “+” symbol represents the logical OR operation, not arithmetic addition.

**What is the purpose of a multiplexer (MUX) in digital circuits?**

- a) To combine multiple digital signals into one
- b) To split one digital signal into multiple signals
- c) To amplify digital signals
- d) To convert analog signals to digital

Answer: a) To combine multiple digital signals into one

Explanation: A multiplexer selects one of several input signals and forwards it to a single output line.

**Which of the following represents the hexadecimal equivalent of decimal 255?**

- a) FF
- b) EE
- c) 11111111
- d) 1111

Answer: a) FF

Explanation: Decimal 255 is equivalent to binary 11111111, which in hexadecimal is represented as FF.

**What is the function of a full adder in digital circuits?**

- a) To subtract two binary numbers
- b) To add two single bits
- c) To add three single bits
- d) To multiply two binary numbers

Answer: c) To add three single bits

Explanation: A full adder adds three single bits: two input bits and one carry bit from a previous addition.