Images and pixels

QuizÂ by GCSE Computer Science Teacher 2

GCSE (AQA)
Computer Science
English National Curriculum

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### Measures 1 skill fromGCSE (AQA)Computer ScienceEnglish National Curriculum

3.3.6.a

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12 questions
• Q1
What are images made up of?
Waves
Binary
Pixels
Pictures
30s
3.3.6.a
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• 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
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• 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
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• 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
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• 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
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• 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
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• 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
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• 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
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• Q9
Which of these is not an image file format
GIF
PNG
WAV
JPEG
30s
3.3.6.a
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• Q10
Which of these file formats results in lossy compression?
GIF
BMP
JPEG
PNG
30s
3.3.6.a
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• 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
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• Q12
How many colours can be represented in a colour depth of 8 bits?
32768
10253
256
65536
30s
3.3.6.a
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