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Worksheets2.6 Data Representation Compression
Total questions: 40
Worksheet time: 30mins
Name
Class
Date
1.
What is compression?
a)
To convert one file to another
b)
To reduce the size of data to save space
c)
To minimise the time taken for a file to be download
d)
To compress something by pressing it hard
2.
What does Lossy Compression do to files?
a)
Increases the file size and keeps the same quality
b)
Eliminates no information at all
c)
Decreases the file size and keeps the same quality
d)
Eliminates unnecessary information in a file to reduce file size
3.
What is Lossless Compression?
a)
No information is lost but file size is increased
b)
There is no loss of information at all after compression
c)
Files which have the exact same data after compression
d)
Compression involves an algorithm
4.
What type of compression does the ZIP format use?
a)
Lossy
b)
Lossless
5.
What type of compression would you use to compress a video?
a)
Lossy
b)
Lossless
6.
What type of compression would you use to compress a text file?
a)
Lossy
b)
Lossless
7.
When Lossy compression is used data is lost?
a)
True
b)
False
8.
Which of the following are not in a compressed format?
a)
JPEG
b)
MPEG
c)
Bitmap
d)
MP3
9.
Uncompressed audio and video files require less memory than compressed files....
a)
True
b)
False
10.
JPEG stands for...
a)
Joint Photo Exempted Grade
b)
Joint Photographic Experts Group
c)
Junior Photographic Export Group
11.
These files will remove data in the compression process in order to make the file smaller
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
12.
These files are still usable even when data has been removed during compression.
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
13.
This type of compression is best used for media files.
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
14.
Media files which can be transmitted over the Internet would be best to use
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
15.
High quality media files created during production would most likley use
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
16.
MP3 and WMA files are both examples of
a)
Audio files using lossy compression.
b)
Audio files using lossless compression.
c)
Video files using lossy compression.
d)
Video files using lossless compression.
e)
Image files using lossy compression
17.
JPEG (JPG) files are an example of
a)
Audio files using lossy compression.
b)
Audio files using lossless compression.
c)
Video files using lossy compression.
d)
Image files using lossless compression.
e)
Image files using lossy compression
18.
MP4, MPEG and MOV files are all examples of
a)
Audio files using lossy compression.
b)
Audio files using lossless compression.
c)
Video files using lossy compression.
d)
Video files using lossless compression.
e)
Image files using lossy compression
19.
AVI files are examples of
a)
Audio files using lossy compression.
b)
Audio files using lossless compression.
c)
Video files using lossy compression.
d)
Video files using lossless compression.
e)
Image files using lossy compression
20.
GIF and BMP files are both examples of
a)
Audio files using lossy compression.
b)
Audio files using lossless compression.
c)
Video files using lossy compression.
d)
Image files using lossless compression.
e)
Image files using lossy compression
21.
FLAC and WAV are both examples of
a)
Audio files using lossy compression.
b)
Audio files using lossless compression.
c)
Video files using lossy compression.
d)
Video files using lossless compression.
e)
Image files using lossy compression
22.
Which of the following cannot use lossy compression?
a)
Word document
b)
Audio file
c)
Video file
d)
Image file
e)
All of them
23.
Which of the following can use lossless compression?
a)
Word document
b)
Audio file
c)
Video file
d)
Image file
e)
All of them
24.
Which type of compression would a program need to use?
a)
Lossy compression
b)
Lossless compression
c)
Doesn't matter. It can use either lossy or lossless compression.
25.
What type of compression would a Python coding file need to use?
a)
Lossy compression
b)
Lossless compression
c)
Doesn't matter. It can use either lossy or lossless compression.
26.
These files do not remove data during the compression process.
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
27.
The more compressed the file, the more noticeable that data has been removed.
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
28.
Once the file has been compressed, it cannot be decompressed back to the original file.
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
29.
Once the file has been compressed, it can be decompressed back to the original file.
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
30.
This type of compression reduces the entire file without removing any data.
a)
Lossy compression
b)
Lossless compression
c)
Both lossy and lossless compression
31.
Makes the file smaller by deleting parts of the file permanently (forever)
a)
Lossy Compression
b)
Lossless Compression
32.
Makes the file smaller by giving repeated patterns/colours a specific code
a)
Lossy Compression
b)
Lossless Compression
33.
Which of these is an advantage for Lossy compression?
a)
The file size becomes significantly (much) smaller
b)
The file size does not become much smaller than 50%
34.
What would you use compression for?
a)
Making an image file smaller
b)
Modifying an image
35.
Which of the following would not be suitable for Lossy Compression?
a)
Images
b)
Sounds
c)
Videos
d)
Text
36.
Compression in general makes it _______ to send, upload and stream data
a)
Quicker
b)
Slower
37.
Lossless compression permanently deletes the data
a)
True
b)
False
38.
Lossy compression would be suitable for text files
a)
True
b)
False
39.
Compression looks for _______ data
a)
Unnecessary
b)
Repeated
40.
There are _____ different types of compression
a)
2
b)
3
c)
4
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