01 Logic Gates and Circuits

Match the following gate symbols to their names.

• AND

• 
• NOT

• 
• OR

• 
• XOR

• 

Match the following descriptions to the correct logic gate.

• Output is True if the input is False.

• AND

• Output is True if both of the inputs are different.

• OR

• Output is True if at least one input is True.

• XOR

• Output is True if both of the inputs are True.

• NOT

If A was 1 and B was 0 in this circuit, what would Q be?

• 0

• 1

In this circuit, if A and B were both 0, what would R be?

• 0

• 1

Which of the following scenarios is the only one where R would be 0 in this circuit?

• If all of the switches were on.

• If all of the switches were off.

• If half of the switches were on.

• If only one of the switches were on.

The following logic circuit would need a Truth Table with _ columns.

Answer explanation

A column is needed for each of the initial inputs, and then the final output from each gate.

If a logic circuit has three inputs, how many rows will there need to be on the Truth Table. Remember - Rows go across. Each possible combination of inputs needs to be on a different row.

• 2

• 3

• 8

• Depends on the type of gates that it uses.

If a logic circuit has three inputs, how many rows will there need to be on the Truth Table. Remember - Rows go across. Each possible combination of inputs needs to be on a different row.

• 2

• 3

• 8

• Depends on the type of gates that it uses.

No Points: How confident are you that you can...

...identify NOT, AND, OR and XOR gates by their circuit symbols.

• Not Confident

• Not Sure

• Quite Confident

• Very Confident

No Points: How confident are you that you can...

...construct a complete truth table for NOT, AND, OR and XOR gates.

• Not Confident

• Not Sure

• Quite Confident

• Very Confident