• True
• False
• #### 2.  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

• Lossy
• Lossless

• Lossy
• Lossless

• True
• False
• #### 6.  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

• True
• False
• #### 8.  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

• Lossy
• Lossless

• Lossy
• Lossless
• #### 11.  Which best describes Lossless Compression?

• No information is lost but file size is increased
• There is no loss in information at all after compression
• Files which have the exact same data after compression
• Compression that involves an algorithm

• True
• False

• 11
• 10
• 01
• 00

• True
• False
• #### 15.  How do you calculate the number of bits of a body of text in ASCII?

• Number of characters * 7
• Number of characters (including spaces) *7
• bits in Huffman * 7
• bits in Huffman / 7
• #### 16.  Which formula shows how to work out the percentage a file has been compressed by?

• bits in (Huffman *7) /100
• bits in ASCii - bits in Huffman
• difference in bits / bits in ASCII * 100
• None of these
• #### 17.  Huffman trees use the _______________ of each character to work out their encoding.

• Frequency
• Order in ASCII
• Number value
• None of these

• resolution
• zipping
• inputting
• caching

• Lossy
• Lossless
• Both
• All of above
• #### 20.  How do you move through a Huffman tree?

• 0 = right 1= left
• 1 = left 2 = right
• 0 = left 1 = right
• 0 = middle 1 = back
• #### 21.  Lossy or lossless? This type of compression gets rid of some information

• Lossy
• Lossless
• Both
• None of these
• #### 22.  What are the main reasons to compress data?

• To reduce secondary storage space
• To reduce packet congestion on networks
• To speed up network transmission times
• All of above
• #### 23.  Data compression usually works by..

• Finding repeating patterns.
• Deleting random bits data

• Lossy
• Lossless
• Both
• All of above

• MPEG
• MP3
• WAV
• BMP

• True
• False
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