Question 1 – Boolean logic - AQA Computer Science Questions

Boolean logic Questions

Practise AQA GCSE Computer Science Boolean logic with exam-style questions for GCSE Computer Science. 83 questions, matched to the AQA GCSE Computer Science (8525) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

A secure laboratory door release system is being designed to control an electronic door lock.

The system has two entry authentication devices: a primary keycard scanner, $K_1$ , and a backup numeric keypad, $K_2$ . Each outputs a 1 if successfully activated. The door should unlock if either of these devices is activated.
The door must only unlock if an emergency lockdown switch, $L$ , is NOT active (meaning $L\,$ outputs a 0 when not active, and 1 when active).
The output to release/unlock the door is $D$ .

Complete the logic circuit for this system by drawing or identifying the correct gates and connections.

A logic circuit template. On the left side, there are three input terminals labeled K_1, K_2, and L. On the right side, there is one output terminal labeled D. In the center is a blank area for drawing logic gates and connecting wires.