01 - Lossy vs Lossless compression

 1. What is compression?

  Reducing the size of a file

  Reducing the size of the CPU

  Improving the quality of a file

  Reducing the available memory

 2. Why might someone want to compress a file?

  To speed up the transfer of a file

  To find similar files

  To make the CPU work faster

  To write a program more quickly

 3. Where is downloaded audio or video often stored before it plays?
Image by Shassaf - Own work, CC BY-SA 4.0,

  In a den

  In a buffer

  In a pen

  In a coal scuttle

 4. Lossy compression removes …

  non-essential data

  data from the middle of the file

  random 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.



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


  mobile voice communications

  high quality audio

  software downloads

 7. Lossless compression records ' ____' in data.





 8. ZIP files are an example of lossless compression.



 9. Lossless compression produces smaller files than lossy compression.



 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