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01 - Lossy vs Lossless compression

 1. What is compression?

  Reducing the size of a file

  Improving the quality of a file

  Reducing the available memory

  Reducing the size of the CPU

 2. Why might someone want to compress a file?

  To find similar files

  To make the CPU work faster

  To write a program more quickly

  To speed up the transfer of a file

 3. Where is downloaded audio or video often stored before it plays? 
Image by Shassaf - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=36228812
buffer.png

  In a den

  In a pen

  In a coal scuttle

  In a buffer

 4. Lossy compression removes …

  random data

  data from the middle of the file

  non-essential data

  data from the beginning and end of the file

 5. Higher frequency and quieter sounds are removed from the original track in MP3 files.

  FALSE

  TRUE

 6. In which of these applications is lossy compression most likely to be used?

  software downloads

  high quality audio

  mobile voice communications

  ebooks

 7. Lossless compression records ' ____' in data.

  intervals

  surpluses

  shortfalls

  patterns

 8. ZIP files are an example of lossless compression.
lossy_lossless.jpg

  True

  False

 9. Lossless compression produces smaller files than lossy compression.

  FALSE

  TRUE

 10. When would lossless compression be preferrable to lossy compression?

  If the data will be transferred on a flash memory stick

  If data will be transferred via the Internet

  If data quality is unimportant

  If data quality is a priority


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