AP Computer Science Principles - Big Idea 2 Data Practice Test

1. Question

Which of the following is a true statement about data compression?

Data compression is only useful for files being transmitted over the Internet.
Regardless of the compression technique used, once a data file is compressed, it cannot be restored to its original state.
Sending a compressed version of a file ensures that the contents of the file cannot be intercepted by an unauthorized user.
There are trade-offs involved in choosing a compression technique for storing and transmitting data.

2. Question

Which file type is lossy compressed sound?

mp4
mp3
wav
wma

3. Question

Which type of compression do zip files use?

Lossy
Lossless
Non-compressed
max-compressed

4. Question

Which unit is the smallest?

Kilobyte
megabyte
Gigabyte
Terabyte

5. Question

Which of the following is NOT an example of metadata for an image file?

Size of the image
Date the image was created
Image resolution
Copy of each image pixel

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?

How long the program takes to run
How much memory the program requires as it runs
How many programming statements the program contains
How much storage space the program requires as it runs

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?

The song was saved using fewer bits per second than the original song.
The song was saved using more bits per second than the original song.
The song was saved using a lossless compression technique.
Some information is lost every time a file is saved from one location on a computer to another location.

8. Question

Consider the following numbers: Binary 1100, Decimal 11, Hexadecimal D. Which letter shows the number’s order from least to greatest?

Binary 1100, Decimal 11, Hexadecimal D
Decimal 11, Binary 1100, Hexadecimal D
Decimal 11, Hexadecimal D, Binary 1100
Hexadecimal D, Decimal 11, Binary 1100

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?

2 more items can be uniquely identified.
10 more items can be uniquely identified.
2 times as many items can be uniquely identified.
10 times as many items can be uniquely identified.

10. Question

What is the best explanation for why digital data is represented in computers in binary?

The binary number system is the only system flexible enough to allow for representing data other than numbers.
As a consequence of history: early pioneers of computing were making secret codes in binary, and this simply evolved into modern computing.
It’s impossible to build a computing machine that uses anything but binary to represent numbers
It’s easier, cheaper, and more reliable to build machines and devices that only have to distinguish between binary states.

11. Question

Approximately how much bigger (how many more bytes) is a megabyte than a kilobyte?

1,000 times bigger
1,00,000 times bigger
1,000,000 times bigger
1,000,000,000 times bigger

12. Question

Which of the following classifies as metadata about a webpage?

The tags that make up the body of the webpage
A table on a webpage
A list on a webpage
The title of the webpage

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?

Lossy Compression
Lossless Compression
Fast Fourier Transform Compression
Tailored Compression

14. Question

When would lossless data compression be preferred over lossy one?

When you do not need to get back to the original file
When you need to display the file on mobile devices and websites
When you need to get back to the original file
When you have limited space available on your computer

15. Question

Which of the following is a reason to use lossy compression?

You want to save space and are not concerned if the file is the highest quality possible.
You want the compressed file to be larger than the original.
You want the highest quality audio file possible, with no modifications.
You want the highest quality image file possible, with no modifications.

16. Question

It is the collection of facts and patterns extracted from data.

Metadata
Information
Database
Message

17. Question

It is a data about a data.

Information
Database
Message
Metadata

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)

Cleaning data
Formatting data
Creating data
Data review

19. Question

__________ are important tools for finding information and recognizing patterns in data.

Visual tools
Data extracting systems
Data filtering systems
Data monitoring systems

Average score
Your score

AP Computer Science Principles – Big Idea 2 Data Practice Test

AP Computer Science Principles – Big Idea 2 Data Practice Test

AP Computer Science Principles – Big Idea 2 Data Practice Test

Quiz Summary

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Results

Results

Categories

1. Question

Which of the following is a true statement about data compression?

2. Question

Which file type is lossy compressed sound?

3. Question

Which type of compression do zip files use?

4. Question

Which unit is the smallest?

5. Question

Which of the following is NOT an example of metadata for an image file?

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?

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?

8. Question

Consider the following numbers: Binary 1100, Decimal 11, Hexadecimal D. Which letter shows the number’s order from least to greatest?

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?

10. Question

What is the best explanation for why digital data is represented in computers in binary?

11. Question

Approximately how much bigger (how many more bytes) is a megabyte than a kilobyte?

12. Question

Which of the following classifies as metadata about a webpage?

13. Question

14. Question

When would lossless data compression be preferred over lossy one?

15. Question

Which of the following is a reason to use lossy compression?

16. Question

It is the collection of facts and patterns extracted from data.

17. Question

It is a data about a data.

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)

19. Question

__________ are important tools for finding information and recognizing patterns in data.