Computers

11th -

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OCR A Level Computer Science (H446) - Component 1.3.1 - Compression, Encryption and Hashing

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  • 1. Multiple Choice
    1 minute
    1 pt

    What are the key reasons for compressing data?

    Less space needed for storage

    Less time to transmit

    Higher quality files

    Reduced amount of processing power

    Limited RAM

  • 2. Multiple Choice
    1 minute
    1 pt

    Lossless compression...

    Is used when not all the information is needed

    Is not as effective as lossy compression

    Can fully regenerate the original file

    Includes files such as .ZIP

    Would be a sensible choice for a music download site

  • 3. Multiple Choice
    1 minute
    1 pt

    Lossy compression...

    Permanently removes data from a file

    Always leads to a noticeable loss of quality

    Aims to remove redundant data

    Can return the original file to its original quality

    Would be a sensible choice for a music download site.`

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