Boolean Logic

Question 1

Why do computers use binary?

Answer 1

Computers are made up of lots of transistors (switches) which can either be OFF (0) or ON (1).

Question 2

What are Logic Gates?

Answer 2

Special circuits built into computer chips that receive binary data, apply a Boolean operation, then output a binary result.

Question 3

What is the function of an AND gate?

Answer 3

Outputs “true”(1) only when both inputs are “true”(1). Otherwise, it outputs “false”(0).

Question 4

What is the function of an OR gate?

Answer 4

Outputs “true”(1) if one or more of its inputs are “true”(1). Otherwise, it outputs “false”(0)

Question 5

What is the function of a NOT gate?

Answer 5

Outputs “true”(1) if input is “false”(0). Outputs “false”(0) if input is “true”(1).

Output that is always the opposite value to the input.

Question 6

How many inputs and outputs does an NOT gate have?

Answer 6

One input
One output

Question 7

How many inputs and outputs does an AND gate have?

Answer 7

Two inputs
One output

Question 8

What is the output of an AND gate when both inputs are 1?

Answer 8

1

Question 9

What is the output of an AND gate when at least one input is 0?

Answer 9

0

Question 10

How many inputs and outputs does an OR gate have?

Answer 10

Two inputs
One output

Question 11

What is the output of an OR gate when at least one input is 1?

Answer 11

1

Question 12

What is the output of an OR gate when both inputs are 0?

Answer 12

0

Question 13

What is a truth table?

Answer 13

A table showing the outputs for all possible combinations of inputs to a logic gate or circuit.