Boolean logic: past paper questions

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• Question 8May/June 2026, paper 21Structured7 marks

  Consider the logic circuit: Write the logic expression for the given logic circuit.

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• Question 6Oct/Nov 2025, paper 22Structured8 marks

  Consider the logic expression: $$X=(J\text{ XOR NOT }K)\text{ NAND NOT }L$$ Draw a logic circuit for the logic expression.

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• Question 9Oct/Nov 2024, paper 22Structured8 marks

  Consider the logic expression: X = (NOT P OR Q) NAND (Q XOR R) Draw a logic circuit for this logic expression.

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• Question 9Oct/Nov 2023, paper 22Structured8 marks

  Consider the logic expression: Z = (A NAND B) OR NOT (B XOR C) Draw a logic circuit for this logic expression.

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• Question 8May/June 2026, paper 22Structured9 marks

  Consider the logic expression: Z = NOT (B OR NOT C) XOR (A NAND C) Draw a logic circuit for this logic expression.

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• Question 7May/June 2025, paper 21Structured8 marks

  Consider the logic expression: $$\mathrm{X}=(\mathrm{A}\mathrm{A}\mathrm{N}\mathrm{D}\mathrm{B})\mathrm{X}\mathrm{O}\mathrm{R}(\mathrm{B}\mathrm{O}\mathrm{R}\mathrm{N}\mathrm{O}\mathrm{T}\mathrm{C})$$ Draw a logic circuit for this logic expression.

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• Question 8May/June 2024, paper 21Structured9 marks

  Consider the logic expression: Z = (R OR NOT T) XOR (NOT S AND T) Draw a logic circuit for this logic expression.

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• Question 9May/June 2023, paper 21Structured8 marks

  Consider this logic expression. Z = (NOT A OR B) AND (B XOR C) Draw a logic circuit for this logic expression.

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• Question 8May/June 2025, paper 22Structured8 marks

  Draw the symbol for an XOR logic gate and complete the truth table for it.

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• Question 2May/June 2024, paper 22Structured4 marksHas a diagram

  Four logic functions and five standard symbols for logic gates are shown. Draw one line to link each logic function to its standard symbol.

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• Question 2May/June 2023, paper 22Structured4 marksHas a diagram

  Four logic gates and five standard symbols for logic gates are shown. Draw one line to link each logic gate to its standard symbol.

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• Question 8May/June 2024, paper 22Structured7 marksHas a diagram

  A logic circuit is to be built to control the opening of a safe used to store money. There are two keys, A and B, and a time switch C. The safe can only open if both keys are used and the time switch is off.

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• Question 8May/June 2023, paper 22Structured4 marksHas a diagram

  Consider this logic expression. X = (A OR B) AND (NOT B AND C) Complete the truth table for this logic expression.

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