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Data Compression

Quiz by GCSE Computer Science Teacher 2

GCSE (AQA)
Computer Science
English National Curriculum

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12 questions
Show answers
  • Q1
    What does the term data compression refer to?
    Reducing the size of data in a program
    The process of reducing a files size by compressing data
    Reducing the number of data sets needed in a program
    The process of reducing the number of files
    30s
    3.3.8.a
  • Q2
    Why might we need to compress data?
    To be able to send it via email
    To reduce the file size and allow more storage space
    To be able to upload it to the internet
    All of these
    30s
    3.3.8.a
  • Q3
    Which of these files can not be compressed?
    A word document
    An image file
    An executable program file
    An audio file
    30s
    3.3.8.a
  • Q4
    What is the name for a program that handles encoding or decoding audio, image and video files?
    Encoder
    Audio-Encoder
    Codex
    Codec
    30s
    3.3.8.a
  • Q5
    What does lossless compression mean?
    Data is not lost during the compression
    Data can be lost during the compression
    Files will be deleted after the compression
    Files will not be deleted after the compression
    30s
    3.3.8.a
  • Q6
    What does lossy compression mean?
    Files will not be deleted after the compression
    Data can be lost during the compression
    Data is not lost during the compression
    Files will be deleted after the compression
    30s
    3.3.8.a
  • Q7
    Microsoft word files can be compressed to a zip file for sending, but this is only a temporary change, why is this?
    All of these reasons
    There is lossless compression method for these file types
    You can not loose data from a word document as it will not read the same after
    The most frequent letters are converted to bits, holding less space, until it is unzipped again
    30s
    3.3.8.a
  • Q8
    If an image is converted from a JPEG to a PNG file type, what type of compression has been used?
    Lossless
    Lossy
    30s
    3.3.8.a
  • Q9
    What is one disadvantage of using lossy compression?
    The quality is better after the compression
    The file can not be restored to its former pre-compression state
    It can not be used on audio files
    It uses up more memory after the encoding
    30s
    3.3.8.a
  • Q10
    What is one disadvantage of loseless compression?
    There are limited file types it can be used on
    The file looses some of its quality
    The process takes too long
    The file size can only be reduced 25%
    30s
    3.3.8.a
  • Q11
    What file type is this process referring to? - The number of bits being used are reduced, this produces less pixels and lower image quality.
    Image
    Video
    Word document
    Audio
    30s
    3.3.8.a
  • Q12
    What file type is this process referring to? - The number of bits being used are reduced, this means the sample rate is reduced and less frames per second are used.
    Video
    Audio
    Word document
    Image
    30s
    3.3.8.a

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