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Question 1 of 10

1. Question
'Lossy Compression' is best described as...
- A form of file compression that reduces the file size by permanently removing some of its data.
- A form of file compression that reduces the file size by temporarily removing some of it is data. This data is is reconstructed when the file is uncompressed.
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Question 2 of 10

2. Question
'Lossless Compression' is best described as...
- A form of file compression that reduces the file size by permanently removing some of its data.
- A form of file compression that reduces the file size by temporarily removing some of it is data. This data is is reconstructed when the file is uncompressed.
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Question 3 of 10

3. Question
'Run Length Encoding' is...
- ...a form of lossless compression that seeks to find patterns / sequences of data that can be encoded using fewer bits that the original data.
- ...a form of lossless compression, which looks to replace the file’s data with a reference to what the data is. For example, repeatedly replacing the data that represents a particular word with the indexed location of where that word is stored in a dictionary.
- ...a form of lossy compression that seeks to find patterns / sequences of data that can be encoded using fewer bits that the original data.
- ...a form of lossy compression, which looks to replace the file’s data with a reference to what the data is. For example, repeatedly replacing the data that represents a particular word with the indexed location of where that word is stored in a dictionary.
- ...a form of lossless compression, which looks at how many times each character appears in a piece of text and assigns each character that appears with a temporary binary code/number, with the most frequent character getting the smallest binary code and the least frequent character getting the largest code.
- ...a form of lossy compression, which looks at how many times each character appears in a piece of text and assigns each character that appears with a temporary binary code/number, with the most frequent character getting the smallest binary code and the least frequent character getting the largest code.
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Question 4 of 10

4. Question
'Dictionary Coding' is...
- ...a form of lossless compression that seeks to find patterns / sequences of data that can be encoded using fewer bits that the original data.
- ...a form of lossless compression, which looks to replace the file’s data with a reference to what the data is. For example, repeatedly replacing the data that represents a particular word with the indexed location of where that word is stored in a dictionary.
- ...a form of lossy compression that seeks to find patterns / sequences of data that can be encoded using fewer bits that the original data.
- ...a form of lossy compression, which looks to replace the file’s data with a reference to what the data is. For example, repeatedly replacing the data that represents a particular word with the indexed location of where that word is stored in a dictionary.
- ...a form of lossless compression, which looks at how many times each character appears in a piece of text and assigns each character that appears with a temporary binary code/number, with the most frequent character getting the smallest binary code and the least frequent character getting the largest code.
- ...a form of lossy compression, which looks at how many times each character appears in a piece of text and assigns each character that appears with a temporary binary code/number, with the most frequent character getting the smallest binary code and the least frequent character getting the largest code.
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Question 5 of 10

5. Question
'Huffman Coding ' is...
- ...a form of lossless compression that seeks to find patterns / sequences of data that can be encoded using fewer bits that the original data.
- ...a form of lossless compression, which looks to replace the file’s data with a reference to what the data is. For example, repeatedly replacing the data that represents a particular word with the indexed location of where that word is stored in a dictionary.
- ...a form of lossy compression that seeks to find patterns / sequences of data that can be encoded using fewer bits that the original data.
- ...a form of lossy compression, which looks to replace the file’s data with a reference to what the data is. For example, repeatedly replacing the data that represents a particular word with the indexed location of where that word is stored in a dictionary.
- ...a form of lossless compression, which looks at how many times each character appears in a piece of text and assigns each character that appears with a temporary binary code/number, with the most frequent character getting the smallest binary code and the least frequent character getting the largest code.
- ...a form of lossy compression, which looks at how many times each character appears in a piece of text and assigns each character that appears with a temporary binary code/number, with the most frequent character getting the smallest binary code and the least frequent character getting the largest code.
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Question 6 of 10

6. Question
When creating a 'tree' during the huffman coding compression method, what is the correct order of steps that need to be carried out?
- 1 Join (as a tree) the first two nodes from the right, adding the frequencies together and adding this sum to the root node.
  2 Re-insert the root node of the tree into the correct numerical position
  3 Repeat until only one node is left
- 1 Join (as a tree) the first two nodes from the right, adding the frequencies together and adding this sum to the root node.
  2 Repeat until only one node is left
  3 Re-insert the root node of the tree into the correct numerical position
- 1 Re-insert the root node of the tree into the correct numerical position
  2 Join (as a tree) the first two nodes from the right, adding the frequencies together and adding this sum to the root node.
  3 Repeat until only one node is left
- 1 Re-insert the root node of the tree into the correct numerical position
  2 Repeat until only one node is left
  3 Join (as a tree) the first two nodes from the right, adding the frequencies together and adding this sum to the root node.
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Question 7 of 10

7. Question
In a tree data structure, what is a node?
- A node is a piece of data in memory.
- A node is a memory location which contains data and (if the node has children) pointers.
- A node is a computer on a network.
- A node is the name given to a complete binary tree.
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Question 8 of 10

8. Question
Select the advantages of compression from the list below:
- Less storage space required.
- Faster download times – improving online experience.
- Improved definition of video when streaming.
- Faster steaming speeds of video/audio files.
- Slower but more reliable processing of data.
- An increase in bandwidth.
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Question 9 of 10

9. Question
MP3s are an example of a file that has been compressed using which compression method?
- Lossy
- Lossless
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Question 10 of 10

10. Question
Zip files are an example of files that have been compressed using which compression method?
- Lossy
- Lossless
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