Data Representation - Compression (GCSE Computing)

The following is a GCSE Computing test covering 'Data Representation - Compression'

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Question 1

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Which statement about audio quality and compression is generally true?

What does "lossy" compression mean?

Which compression algorithm builds a dictionary of repeated patterns during compression?

What does "lossless" compression mean?

What is an advantage of lossless compression?

Which of the following is an example of lossy compression for images?

What is a disadvantage of lossy compression?

Which format is commonly used for simple animations and supports a lossless indexed-colour compression?

How is compression ratio normally calculated?

Which statement best describes the trade-off in lossy compression?

Which type of data is typically the hardest to compress?

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