Skip to content
Try on iPad

Number bases: AQA A‑Level Computer Science questions

Every AQA A-Level Computer Science exam question on 4.5.2 Number bases, 2020–2025, with its mark scheme and examiner’s report.

Find questions561
Calculations

561 questions

  1. Q02.2

    June 2025 · AS Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    June 2025 AS Paper 2, question 02.2: The bit pattern in Figure 1 represents an 8-bit unsigned binary integer. Figure 1 0 1 0 0 0 0 1 1 Convert the bit pattern in Figure 1 to decimal. [1 mark]

  2. Q02.1

    June 2024 · AS Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    June 2024 AS Paper 2, question 02.1: Convert the bit pattern 10001010 to hexadecimal. [1 mark]

  3. Q02.2

    June 2024 · AS Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    June 2024 AS Paper 2, question 02.2: Represent the decimal number 139 as an 8-bit unsigned binary integer. [1 mark]

  4. Q02.1

    June 2023 · AS Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    June 2023 AS Paper 2, question 02.1: Assembly language programmers can use hexadecimal to represent bit patterns instead of binary. Explain why assembly language programmers will often choose to us

  5. Q01.1

    June 2022 · Paper 2

    2 marks4.5.2 Number bases
    The whole paper ↗
    June 2022 Paper 2, question 01.1: Describe how a 12-bit unsigned binary integer such as 010010101110 can be converted directly into hexadecimal. The method you describe must not involve converti

  6. Q01.2

    June 2022 · Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    June 2022 Paper 2, question 01.2: State one reason why hexadecimal is often used in preference to binary. [1 mark]

  7. Q02.1

    June 2022 · AS Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    June 2022 AS Paper 2, question 02.1: Convert the decimal number 177 to unsigned binary using 8 bits. [1 mark]

  8. Q02.2

    June 2022 · AS Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    June 2022 AS Paper 2, question 02.2: Convert the decimal number 193 to hexadecimal. [1 mark]

  9. Q01.1

    November 2020 · AS Paper 2

    1 mark4.5.2 Number bases
    The whole paper ↗
    November 2020 AS Paper 2, question 01.1: State the decimal equivalent of the hexadecimal number C57 [1 mark]
All 9 questions on Number bases, as a list
  1. June 2025, AS Paper 2, Q02.2 (1 mark): The bit pattern in Figure 1 represents an 8-bit unsigned binary integer. Figure 1 0 1 0 0 0 0 1 1 Convert the bit pattern in Figure 1 to decimal. [1 mark]
  2. June 2024, AS Paper 2, Q02.1 (1 mark): Convert the bit pattern 10001010 to hexadecimal. [1 mark]
  3. June 2024, AS Paper 2, Q02.2 (1 mark): Represent the decimal number 139 as an 8-bit unsigned binary integer. [1 mark]
  4. June 2023, AS Paper 2, Q02.1 (1 mark): Assembly language programmers can use hexadecimal to represent bit patterns instead of binary. Explain why assembly language programmers will often choose to us
  5. June 2022, Paper 2, Q01.1 (2 marks): Describe how a 12-bit unsigned binary integer such as 010010101110 can be converted directly into hexadecimal. The method you describe must not involve converti
  6. June 2022, Paper 2, Q01.2 (1 mark): State one reason why hexadecimal is often used in preference to binary. [1 mark]
  7. June 2022, AS Paper 2, Q02.1 (1 mark): Convert the decimal number 177 to unsigned binary using 8 bits. [1 mark]
  8. June 2022, AS Paper 2, Q02.2 (1 mark): Convert the decimal number 193 to hexadecimal. [1 mark]
  9. November 2020, AS Paper 2, Q01.1 (1 mark): State the decimal equivalent of the hexadecimal number C57 [1 mark]

Questions, mark schemes and examiner’s reports are © AQA, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Full past papers.

Rather write your answers by hand on iPad? Plumi marks them against the same mark schemes.