AP Computer Science Principles – Big Idea 2 Data Practice Test
AP Computer Science Principles – Big Idea 2 Data Practice Test
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Question 1 of 19
1. Question
Which of the following is a true statement about data compression?
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Question 2 of 19
2. Question
Which file type is lossy compressed sound?
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Question 3 of 19
3. Question
Which type of compression do zip files use?
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Question 4 of 19
4. Question
Which unit is the smallest?
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Question 5 of 19
5. Question
Which of the following is NOT an example of metadata for an image file?
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Question 6 of 19
6. Question
A programmer is writing a program that is intended to be able to process large amounts of data. Which of the following considerations is LEAST likely to affect the ability of the program to process larger data sets?
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Question 7 of 19
7. Question
A student is recording a song on her computer. When the recording is finished, she saves a copy on her computer. The student notices that the saved copy is of lower sound quality than the original recording. Which of the following could be a possible explanation for the difference in sound quality?
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Question 8 of 19
8. Question
Consider the following numbers: Binary 1100, Decimal 11, Hexadecimal D. Which letter shows the number’s order from least to greatest?
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Question 9 of 19
9. Question
An online store uses 6-bit binary sequences to identify each unique item for sale. The store plans to increase the number of items it sells and is considering using 7-bit binary sequences. Which of the following best describes the result of using 7-bit sequences instead of 6-bit sequences?
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Question 10 of 19
10. Question
What is the best explanation for why digital data is represented in computers in binary?
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Question 11 of 19
11. Question
Approximately how much bigger (how many more bytes) is a megabyte than a kilobyte?
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Question 12 of 19
12. Question
Which of the following classifies as metadata about a webpage?
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Question 13 of 19
13. Question
A compression scheme for long strings of bits called run-length encoding is described as follows: Rather than record each 0 and 1 individually, instead record “runs” of bits by storing the number of consecutive 1s and 0s that appear. Since it’s binary, any run of 0s must be followed by a run of 1s (even if the run is only 1-bit long) and vice versa. Thus, you can store a list of small numbers that represents the alternating runs of 0s and 1s. Above is an example: To uncompress the data back into its original binary state, you simply reverse the process. This technique is an example of what type of compression?
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Question 14 of 19
14. Question
When would lossless data compression be preferred over lossy one?
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Question 15 of 19
15. Question
Which of the following is a reason to use lossy compression?
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Question 16 of 19
16. Question
It is the collection of facts and patterns extracted from data.
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Question 17 of 19
17. Question
It is a data about a data.
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Question 18 of 19
18. Question
It is a process that makes the data uniform without changing their meaning (e.g., replacing all equivalent abbreviations, spellings, and capitalizations with the same word)
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Question 19 of 19
19. Question
__________ are important tools for finding information and recognizing patterns in data.
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