Quiz  /  Data compression Class 11 MCQ Questions With Answers

  • 1. 
    When Lossy compression is used data is lost?

  • True
  • False

  • 2. 
    What is Lossless Compression?

  • No information is lost but file size is increased
  • There is no loss of information at all after compression
  • Files which have the exact same data after compression
  • Compression involves an algorithm

  • 3. 
    Jaspreet and Mark are recording a podcast that they will be uploading to the internet so that listeners can download or stream it. What type of compression is suitable for the sound file?

  • Lossy
  • Lossless

  • 4. 
    What type of compression would you use to compress a text file?

  • Lossy
  • Lossless

  • 5. 
    Uncompressed audio and video files require less memory than compressed files....

  • True
  • False

  • 6. 
    What does Lossy Compression do to files?

  • Increases the file size and keeps the same quality
  • Eliminates no information at all
  • Decreases the file size and keeps the same quality
  • Eliminates unnecessary information in a file to reduce file size

  • 7. 
    TRUE or FALSE: Some file formats are able to support both lossy and lossless compression

  • True
  • False

  • 8. 
    What is compression?

  • To convert one file to another
  • To reduce the size of data to save space
  • To minimise the time taken for a file to be download
  • To compress something by pressing it hard

  • 9. 
    What type of compression does the ZIP format use?

  • Lossy
  • Lossless

  • 10. 
    Kara is using an app to convert printed text into e-books that she can read on her phone. What type of compression would be appropriate here?

  • Lossy
  • Lossless

  • 11. 
    Which best describes Lossless Compression?

  • No information is lost but file size is increased
  • There is no loss in information at all after compression
  • Files which have the exact same data after compression
  • Compression that involves an algorithm

  • 12. 
    The purpose of data compression is to decrease file sizes .

  • True
  • False

  • 13. 
    The correct encoding of the letter C in this tree is...

  • 11
  • 10
  • 01
  • 00

  • 14. 
    Data encryption and compression both work on binary code.

  • True
  • False

  • 15. 
    How do you calculate the number of bits of a body of text in ASCII?

  • Number of characters * 7
  • Number of characters (including spaces) *7
  • bits in Huffman * 7
  • bits in Huffman / 7

  • 16. 
    Which formula shows how to work out the percentage a file has been compressed by?

  • bits in (Huffman *7) /100
  • bits in ASCii - bits in Huffman
  • difference in bits / bits in ASCII * 100
  • None of these

  • 17. 
    Huffman trees use the _______________ of each character to work out their encoding.

  • Frequency
  • Order in ASCII
  • Number value
  • None of these

  • 18. 
    Which of these terms is a type of data compression?

  • resolution
  • zipping
  • inputting
  • caching

  • 19. 
    Lossy or lossless? This type of compression does not get rid of any data

  • Lossy
  • Lossless
  • Both
  • All of above

  • 20. 
    How do you move through a Huffman tree?

  • 0 = right 1= left
  • 1 = left 2 = right
  • 0 = left 1 = right
  • 0 = middle 1 = back

  • 21. 
    Lossy or lossless? This type of compression gets rid of some information

  • Lossy
  • Lossless
  • Both
  • None of these

  • 22. 
    What are the main reasons to compress data?

  • To reduce secondary storage space
  • To reduce packet congestion on networks
  • To speed up network transmission times
  • All of above

  • 23. 
    Data compression usually works by..

  • Finding repeating patterns.
  • Deleting random bits data

  • 24. 
    Lossy or lossless? This type of compression makes the file smaller

  • Lossy
  • Lossless
  • Both
  • All of above

  • 25. 
    WHAT TYPE OF FILE IS REPRESENTED HERE?

  • MPEG
  • MP3
  • WAV
  • BMP

  • 26. 
    Data compression means to decrease the file size

  • True
  • False
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