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O-LevelComputer ScienceData Representation2210/11 · May/June 2018 · Q46 Marks

Michele wants to email a file to Elsa. The file is too large so it must be compressed.

  1. (a)Name two types of compression that Michele could use. Compression type 1 ................................................................................................................................. Compression type 2 .................................................................................................................................[2]
  2. (b)The file Michele is sending contains the source code for a large computer program. Identify which type of compression would be most suitable for Michele to use. Explain your choice. Compression type.......................................................................................................................... Explanation...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................[4]

Mark scheme

Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.

  1. [1] (a) Lossy (compression)
  2. [1] (a) Lossless (compression)
  3. [1] (b) Lossless (compression)
  4. [1] (b) The file can be restored/decompressed to the exact same state it was before compression/ to original
  5. [1] (b) (It is a computer program so) no data can be lost // Lossy would remove data
  6. [1] (b) Will not run correctly (with any other compression)
  7. [1] (b) (Lossless) will give repeating words/sections of word a value// RLE is used // Other valid examples of methods of lossless compression
  8. [1] (b) Value is recorded in an index

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About this question

Topic
Data Representation, O-Level Computer Science (syllabus 2210). Structured question, 6 marks.
Source
O-Level Computer Science, May/June 2018 Paper 1 Variant 1, question 4.

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