plumiCombinational logic: AQA A‑Level Physics questions
AQA A-Level Physics past-paper questions on 3.13.5.1 Combinational logic, 2008–2025, with mark schemes and examiner’s reports where available.
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All 37 questions on Combinational logic, as a list
- June 2025, Paper 3 Electronics, Q01.1 (5 marks): Figure 1 shows a system diagram for a timer designed by a student. Figure 1 The system displays the numbers from 00 to 59 before resetting. The timer is designe
- June 2025, Paper 3 Electronics, Q01.2 (2 marks): Another student designs a logic system to combine judgements from three people. When at least two of the three people input logic 1, the system provides an outp
- June 2025, Paper 3 Electronics, Q01.3 (1 mark): A single logic gate can sometimes be used to replace a more complex logic system. Figure 4 shows a logic system with inputs A and B and output Q. Figure 4 Which
- June 2024, Paper 3 Electronics, Q01.1 (2 marks): Explain how the logic level applied at B in Figure 1 determines the output frequency at Q. [2 marks]
- June 2024, Paper 3 Electronics, Q01.2 (2 marks): Write the Boolean algebra expression for output Q in terms of the inputs A, B and C. Use only the logic operations shown in Figure 1. [2 marks] Q =
- June 2024, Paper 3 Electronics, Q01.3 (1 mark): Option 1 is tested by replacing the 1 Hz signal generator with a manual input. The manual input is provided by the combination of a push-to-make switch and a 10
- June 2024, Paper 3 Electronics, Q01.5 (2 marks): To make the two-tone siren, the manufacturer decides to use a new design, Option 2. Option 2 contains: • one 1024 Hz signal generator • one N-bit binary counter
- June 2023, Paper 3 Electronics, Q01.2 (1 mark): One of the logic outputs a to g is controlled by a single NOT gate. This gate uses one of the inputs A, B or C. State the input that is used and the segment tha
- June 2023, Paper 3 Electronics, Q01.3 (1 mark): X represents one of the logic outputs. The Boolean expression for this output is: X = ( ) + ⋅ A B C State which of the logic outputs a to g is being controlled
- June 2023, Paper 3 Electronics, Q01.4 (3 marks): Y represents another of the logic outputs. The Boolean expression for this output is: Y = ( ) ( ) + ⋅ ⋅ A B B C Complete Figure 3 to show the combination of log
- June 2023, Paper 3 Electronics, Q05 (6 marks): Figure 10 shows a circuit that has an input signal which is a noisy square wave. The circuit is used to remove the noise and switch a motor M on and off. Figure
- June 2022, Paper 3 Electronics, Q02.1 (2 marks): Write the simplest Boolean algebra expression for output X in terms of inputs A and B. [2 marks] X =
- June 2022, Paper 3 Electronics, Q02.2 (1 mark): State the name of logic gate 5 in Figure 4. [1 mark]
- June 2022, Paper 3 Electronics, Q02.3 (2 marks): Complete Table 1, the truth table for this logic system. [2 marks] Table 1 B A C D E X Y Z 0 0 1 1 0 0 1 0 1 1 1 0 1 0 1 1 1 0 0 0
- June 2022, Paper 3 Electronics, Q02.4 (1 mark): Suggest a single logic gate that can replace the combination of gates 5 and 6 in this system. [1 mark]
- June 2022, Paper 3 Electronics, Q02.5 (1 mark): The logic system in Figure 4 is designed to indicate which of inputs A and B has the larger binary value, or whether the values are the same. Each decision is i
- November 2021, Paper 3 Electronics, Q02.1 (1 mark): Table 2 is a partially completed truth table for the logic subsystem. Table 2 Inputs Output C B A Q 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 1 1 0 1 1 1 0 1 1 1 Co
- November 2021, Paper 3 Electronics, Q02.2 (2 marks): Complete Figure 7 to show how this switch, together with a 10 kΩ resistor, can be connected to create the door detector circuit in Figure 5. Label the output of
- November 2021, Paper 3 Electronics, Q02.3 (2 marks): Write the Boolean algebra expression for Q in terms of inputs A, B and C. In your answer use only AND and NOR operators. [2 marks] Q =
- November 2021, Paper 3 Electronics, Q02.4 (1 mark): Figure 9 shows a logic circuit that has the same function as the circuit in Figure 8. Only one type of gate is used in the circuit in Figure 9. Figure 9 State t
- November 2021, Paper 3 Electronics, Q02.5 (1 mark): Microchips containing two-input logic gates are mass-produced. Each microchip contains four identical logic gates. A manufacturer of the logic circuit used in t
- November 2020, Paper 3 Electronics, Q01.2 (2 marks): A logic system is designed to identify prime numbers. The binary codes from the counter are now applied to the inputs ABC of the logic system shown in Figure 2.
- November 2020, Paper 3 Electronics, Q01.3 (1 mark): Complete Table 1, the truth table for the logic system in Figure 2. [1 mark] Table 1 Decimal number C B A D E F W 0 0 0 0 1 0 0 1 0 0 1 1 0 0 2 0 1 0 1 0 1 3 0
- November 2020, Paper 3 Electronics, Q01.4 (1 mark): The logic system in Question 01.2 is replaced with one that gives an output S using the same binary input codes CBA. The Boolean algebra equation for output S i
- November 2020, Paper 3 Electronics, Q01.5 (2 marks): Complete Figure 3 by drawing the logic system for S. You must use only the logic gate operations given in S = + A B C .( ) [2 marks] Figure 3
- June 2019, Paper 3 Electronics, Q01.2 (1 mark): A student sets up the counter to make the traffic light sequence: red → red + amber → green → amber The sequence then repeats. Figure 3 shows a partially comple
- June 2019, Paper 3 Electronics, Q04.5 (1 mark): The output W from the operational amplifier shown in Figure 12 becomes one of three inputs to the combinational logic circuit shown in Figure 13. Figure 13 Writ
- June 2018, Paper 3 Electronics, Q01.1 (2 marks): Two logic inputs, A and B, feed into the logic circuit shown in Figure 1. The logic output from the circuit is Q. Figure 1 Deduce the Boolean expression for the
- June 2018, Paper 3 Electronics, Q01.2 (2 marks): The truth table shows some of the logic states for the logic gates in Figure 1. Complete the truth table. [2 marks] B A C D E F Q 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1
- June 2018, Paper 3 Electronics, Q01.3 (2 marks): Figure 2 shows a different logic circuit that produces the same logic output as that of Figure 1. Figure 2 A manufacturer wants to produce a system that uses th
- June 2018, Paper 3 Electronics, Q01.4 (1 mark): State the single logic gate that would perform the same logic function as the circuits shown in Figure 1 and Figure 2. [1 mark]
- June 2017, Paper 3 Electronics, Q02.1 (2 marks): Complete Table 1 to show the logic outputs for the lamps L1 and L6. [2 marks]
- June 2017, Paper 3 Electronics, Q02.2 (1 mark): Deduce the simplest Boolean expression that can be used to show how output L7 can be controlled by the logic inputs. [1 mark]
- June 2017, Paper 3 Electronics, Q02.3 (2 marks): Figure 6 shows some of the input and output pins of the 4-bit binary counter. The data sheet for the counter indicates that the counter resets when the reset pi
- June 2017, Paper 3 Electronics, Q02.4 (3 marks): The output of both L3 and L4 can be written as (A . B . Cഥ) + (Bഥ . C) Figure 7 shows part of a logic circuit needed to represent this Boolean expression. Compl
- Specimen, Paper 3 Electronics, Q06.1 (1 mark): The Boolean equation for a particular logic circuit with inputs A and B and output Q is: 𝐐= (𝐀. 𝐁) + (𝐀ഥ. 𝐁ഥ) 0 6 Table 1 shows intermediate logic signals for t
- Specimen, Paper 3 Electronics, Q06.2 (3 marks): The Boolean equation for a particular logic circuit with inputs A and B and output Q is: 𝐐= (𝐀. 𝐁) + (𝐀ഥ. 𝐁ഥ) 0 6 Complete the diagram in Figure 6 to show the l
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