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 of the following is an example of a lossy video codec family often used for streaming and storage?

What happens when you try to compress a file that is already compressed?

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

If an 8000-byte file is compressed with a ratio of 4:1, what is the compressed file size?

Which is the main practical difference between lossy and lossless compression?

Which metric is most useful for comparing how effective two compression methods are?

Which statement about compressed files is true?

Which statement about audio quality and compression is generally true?

In information theory, what does "entropy" of data measure in the context of compression?

How is compression ratio normally calculated?

Run-length encoding (RLE) is most effective on which type of data?

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