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01 - Lossy vs Lossless compression

 1. What is compression?

  Reducing the available memory

  Improving the quality of a file

  Reducing the size of the CPU

  Reducing the size of a file

 2. Why might someone want to compress a file?

  To make the CPU work faster

  To speed up the transfer of a file

  To write a program more quickly

  To find similar files

 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 buffer

  In a pen

  In a den

  In a coal scuttle

 4. Lossy compression removes …

  data from the middle of the file

  non-essential data

  data from the beginning and end of the file

  random data

 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

  mobile voice communications

  high quality audio

  ebooks

 7. Lossless compression records ' ____' in data.

  intervals

  patterns

  surpluses

  shortfalls

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

  True

  False

 9. Lossless compression produces smaller files than lossy compression.

  TRUE

  FALSE

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

  If data quality is a priority

  If the data will be transferred on a flash memory stick

  If data quality is unimportant

  If data will be transferred via the Internet


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