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Computer Science
Data Compression
Quiz 3
Solution
Q.1.
When is Run Length Encoding used?
When we want to compress patterns of data
When we want to decompress patterns of data
When we want to encode running videos
Q.2.
What type of compression would you use to compress a text file?
Lossy
Lossless
Q.3.
Data compression is important for websites because:
Your webpage will load faster
Compressed images look better
Q.4.
What type of compression does the ZIP format use?
Lossy
Lossless
Q.5.
What is Lossless Compression?
No information is lost but file size is increased
There is no loss of information at all after compression
Files which have the exact same data after compression
Compression involves an algorithm
Q.6.
What is compression?
To convert one file to another
To reduce the size of data to save space
To minimise the time taken for a file to be download
To compress something by pressing it hard
Q.7.
What does Lossy Compression do to files?
Increases the file size and keeps the same quality
Eliminates no information at all
Decreases the file size and keeps the same quality
Eliminates unnecessary information in a file to reduce file size
Q.8.
Compression that can compress data files without losing any of the information is called
Lossy
Lossless
Q.9.
How many bytes are in 2GB?
2,000000 (2 million)
2000 (2 thousand)
2,000,000,000 (2 billion)
Q.10.
How many bytes are in 2KB?
2,000000 (2 million)
2000 (2 thousand)
2,000,000,000 (2 billion)
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