GCSE Computer Science Paper 2: Topic 4

What shape is used to represent a NOT gate in logic diagrams?

• Rectangle

• Triangle without a circle

• Triangle with a circle at the end

• Circle

What does the truth table for a NOT gate indicate about its output when the input is 1?

• Output is 0

• Output is 1

• Output is unchanged

• Output alternates between 0 and 1

In an AND gate, when do you get an output of 1?

• At least one input is 1

• Both inputs are 0

• Both inputs are 1

• None of the inputs are 1

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

• The output alternates

• The output is unchanged

• 1

• 0

What alternative name is given to the OR gate?

• Negation

• Conjunction

• Multiplication

• Disjunction

Which condition must be met for an OR gate to output 0?

• Both inputs are 1

• At least one input is 1

• Both inputs are 0

• At least one input is 0