Quizalize logo
placeholder image to represent content

Images and pixels

Quiz by GCSE Computer Science Teacher 2

GCSE (AQA)
Computer Science
English National Curriculum

Feel free to use or edit a copy

includes Teacher and Student dashboards

Measures 1 skill from
GCSE (AQA)
Computer Science
English National Curriculum

3.3.6.a

Track each student's skills and progress in your Mastery dashboards

With a free account, teachers can
  • edit the questions
  • save a copy for later
  • start a class game
  • view complete results in the Gradebook and Mastery Dashboards
  • automatically assign follow-up activities based on students’ scores
  • assign as homework
  • share a link with colleagues
  • print as a bubble sheet

Our brand new solo games combine with your quiz, on the same screen

Correct quiz answers unlock more play!

New Quizalize solo game modes
12 questions
Show answers
  • Q1
    What are images made up of?
    Waves
    Binary
    Pixels
    Pictures
    30s
    3.3.6.a
    Edit
    Delete
  • Q2
    What is a pixel?
    A collection of colours in a graphic image
    The name given to the colours used in images
    A square in a graphic image with an assigned colour
    A black or white image
    30s
    3.3.6.a
    Edit
    Delete
  • Q3
    Why are pixels encoded into binary representations?
    So they can be understood by computers
    To save storage
    To create smaller file sizes
    To make it easier to humans to read
    30s
    3.3.6.a
    Edit
    Delete
  • Q4
    What does image resolution refer to?
    The number of versions of the image
    The image after compression
    The numbers of pixels per inch (ppi)
    The number of images in a folder
    30s
    3.3.6.a
    Edit
    Delete
  • Q5
    What is the correct formula for calculating the file size of an image?
    Pixels high + pixels wide + colour depth = file size
    Pixels high x pixels wide x colour depth = file size
    Pixels high x pixels wide / colour depth = file size
    Pixels high x pixels wide + colour depth = file size
    30s
    3.3.6.a
    Edit
    Delete
  • Q6
    What does the term colour depth mean?
    The amount of colours found in an image
    The amount of bits available to store colour in an image
    The amount of pixels per inch
    The file size of an image
    30s
    3.3.6.a
    Edit
    Delete
  • Q7
    What is a bitmap?
    An image made up of lines and shapes
    An image made up of a number of pixels
    A map of the colour ranges in an image
    A colour chart to use with images
    30s
    3.3.6.a
    Edit
    Delete
  • Q8
    What does reducing the image resolution mean for the file size?
    It increased the file size
    The file size grows at the pixels grow
    It reduces the file size
    The file size stays the same
    30s
    3.3.6.a
    Edit
    Delete
  • Q9
    Which of these is not an image file format
    GIF
    PNG
    WAV
    JPEG
    30s
    3.3.6.a
    Edit
    Delete
  • Q10
    Which of these file formats results in lossy compression?
    GIF
    BMP
    JPEG
    PNG
    30s
    3.3.6.a
    Edit
    Delete
  • Q11
    Why does saving a thumb nail from google, offer a lower quality image than the source file?
    The image needs to be copied and not saved
    The owner of the image copyrights the image to stop it being used
    It is a snapshot of the original and does not have the same resolution
    The thumb nail will have a clearer quality if expanded
    30s
    3.3.6.a
    Edit
    Delete
  • Q12
    How many colours can be represented in a colour depth of 8 bits?
    32768
    10253
    256
    65536
    30s
    3.3.6.a
    Edit
    Delete

Teachers give this quiz to your class