AQA 8525 3.3 Data Compression Quiz

Which of the following is NOT a use of compressing data files?

• Smaller files take up less storage space on a device

• It allows web pages to load more quickly in web browsers

• Compressed files are more difficult to send via email

• Streaming services normally have restrictions on the size of the attachment you can send

What is the difference between lossy and lossless compression?

• Lossy compression temporarily removes data, while lossless compression permanently removes data

• Lossy compression permanently removes data, while lossless compression temporarily removes data

• Both lossy and lossless compression permanently remove data

• Both lossy and lossless compression do not remove any data

Which of the following is a pro of lossy compression?

• It can be decompressed, turned back into the original

• It greatly reduces file size, meaning more files can be stored

• There is no reduction in quality, the compressed file should look or sound like the original

• It allows for a slight reduction in file size

Which of the following file types is typically associated with lossless compression?

• MP3 (audio)

• JPEG (image)

• FLAC (audio)

• AMC (audio)

What is a disadvantage of lossless compression compared to lossy compression?

• Lossless compression results in a greater reduction in file size

• Lossless compression files cannot be decompressed

• Lossless compression still takes up quite a bit of space on your device

• Lossless compression files are harder to stream or download quickly

Data compression is important for websites because:

• Your webpage will load faster
• Compressed images look better

The first line of this image in RLE would be...

• 8W, 1Bl, 20B, 1W

• 10B, 4Y, 17R, 2G

• 2G, 10P, 17Y, 2Bl

Algorithm used to strip out least important data

• Lossy Compression
• Lossless Compression

Typically less effective at reducing file size

• Lossy Compression
• Lossless Compression

Examples: JPEG, MP3, MPEG

• Lossy Compression
• Lossless Compression