Explain what data compression is.
Understand why data may be compressed and that there are different ways to compress data.
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Q 1/12
Score 0
What does the term data compression refer to?
30
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
Q 2/12
Score 0
Why might we need to compress data?
30
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
12 questions
Q.
What does the term data compression refer to?
1
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3.3.8.a
Q.
Why might we need to compress data?
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3.3.8.a
Q.
Which of these files can not be compressed?
3
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3.3.8.a
Q.
What is the name for a program that handles encoding or decoding audio, image and video files?
4
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3.3.8.a
Q.
What does lossless compression mean?
5
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3.3.8.a
Q.
What does lossy compression mean?
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30 sec
3.3.8.a
Q.
Microsoft word files can be compressed to a zip file for sending, but this is only a temporary change, why is this?
7
30 sec
3.3.8.a
Q.
If an image is converted from a JPEG to a PNG file type, what type of compression has been used?
8
30 sec
3.3.8.a
Q.
What is one disadvantage of using lossy compression?
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30 sec
3.3.8.a
Q.
What is one disadvantage of loseless compression?
10
30 sec
3.3.8.a
Q.
What file type is this process referring to? - The number of bits being used are reduced, this produces less pixels and lower image quality.
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30 sec
3.3.8.a
Q.
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.
