Data Representation - Compression (GCSE Computing)

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

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

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

What is a disadvantage of lossy compression?

What does "lossy" compression mean?

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

What does "lossless" compression mean?

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

Which algorithm is dictionary-based and commonly used in GIF and old ZIP variants?

In Huffman coding, what usually happens to rare symbols compared to frequent symbols?

What determines the code length for symbols in Huffman coding?

What is the role of a psychoacoustic model in audio compression algorithms like MP3?

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