Logic Boolean Gates (Intermediate)

Question 1

Define AND gate.

Answer 1

A digital logic gate that outputs true only if all inputs are true.

Question 2

What is the output of an OR gate with one true input?

Answer 2

The output is true.

Question 3

True or false: An XOR gate outputs true if both inputs are the same.

Answer 3

FALSE

An XOR gate outputs true only if inputs differ.

Question 4

Fill in the blank: An NAND gate is the opposite of a(n) ______.

Answer 4

AND gate

Question 5

What does a NOR gate output when all inputs are false?

Answer 5

The output is true.

Question 6

Define NOT gate.

Answer 6

A gate that inverts the input signal; outputs true if input is false.

Question 7

What is the function of a buffer in digital circuits?

Answer 7

To strengthen the signal without changing its value.

Question 8

True or false: Logic gates can be implemented using transistors.

Answer 8

TRUE

Question 9

Fill in the blank: A truth table shows all possible ______ of a logic circuit.

Answer 9

Input combinations

Question 10

What is the primary use of logic gates?

Answer 10

To perform basic logical functions in digital circuits.

Question 11

Define combinational logic.

Answer 11

Logic where the output depends only on current inputs, not past states.

Question 12

What is a half adder?

Answer 12

A circuit that adds two single binary digits, producing a sum and carry.

Question 13

True or false: A full adder can add three binary digits.

Answer 13

TRUE

Question 14

Fill in the blank: The output of an AND gate is true only when ______.

Answer 14

All inputs are true

Question 15

What is the output of a NAND gate with two true inputs?

Answer 15

The output is false.

Question 16

Define logic level.

Answer 16

The state of a signal, typically high (1) or low (0).

Question 17

What does a decoder do?

Answer 17

Converts binary information from n input lines to a maximum of 2^n unique output lines.

Question 18

True or false: An encoder performs the reverse function of a decoder.

Answer 18

TRUE

Question 19

Fill in the blank: A multiplexer selects one of many inputs and forwards it to a single ______.

Answer 19

Output line

Question 20

What is a demultiplexer?

Answer 20

A device that takes a single input and channels it to one of several outputs.

Question 21

Define Boolean algebra.

Answer 21

A mathematical structure that deals with true or false values.

Question 22

What is the purpose of Karnaugh maps?

Answer 22

To simplify Boolean expressions and minimize logic circuits.

Question 23

True or false: De Morgan’s Theorems are used to simplify logic expressions.

Answer 23

TRUE

Question 24

Fill in the blank: The output of an OR gate is false only when ______.

Answer 24

All inputs are false

Question 25

What is the role of **flip-flops** in digital circuits?

Answer 25

To store binary data and maintain state information.