SAM HARRIS TECH REVISION

Extra Data Representation Past Paper Questions (J277)

Note [!]: Data Representation is not its own topic.

• Year: 2024 (June)
  A sound file is recorded. Describe how sampling is used to store the sound in a digital form.
  Mark: [3]
• Year: 2024 (June)
  Calculate the maximum number of different colours that can be represented with a colour depth of 7 bits.
  Mark: [1]
• Year: 2023 (June)
  Convert the denary number 104 into an 8-bit binary number. Show your working.
  Mark: [2]
• Year: 2023 (June)
  Explain how an overflow error can occur when adding two 8-bit binary values.
  Mark: [2]
• Year: 2022 (June)
  State two advantages of using hexadecimal instead of binary to represent numbers in computer science.
  Mark: [2]
• Year: 2022 (June)
  An image is 100 pixels wide and 50 pixels high. It has a colour depth of 4 bits. Calculate the file size of the image in bytes. Show your working.
  Mark: [3]
• Year: 2021 (November)
  Explain the difference between a character set and a character.
  Mark: [2]
• Year: 2021 (November)
  Identify two reasons why Unicode was introduced as an alternative to ASCII.
  Mark: [2]
• Year: 2020 (Sample Paper)
  Perform a binary shift left of 2 places on the binary number 00011100.
  Mark: [1]
• Year: 2020 (Sample Paper)
  Explain how the sampling frequency affects the quality and size of a sound file.
  Mark: [4]