AP CSP Data Compression (2.2)
Quiz
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Computers
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9th - 12th Grade
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Practice Problem
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Medium
Herman Galioulline
Used 93+ times
FREE Resource
About this resource
This quiz focuses on data compression algorithms within the broader context of computer science principles, specifically examining the fundamental differences between lossless and lossy compression techniques. Designed for advanced high school students at the 11th-12th grade level, this assessment evaluates students' understanding of how compression algorithms function, their respective advantages and limitations, and the practical applications of each type in real-world scenarios. Students need to grasp the core concept that lossless compression preserves all original data and allows perfect reconstruction, while lossy compression sacrifices some data to achieve greater file size reduction. The questions require students to analyze trade-offs between compression ratio, data integrity, transmission speed, and storage efficiency, demonstrating their ability to evaluate which compression method suits specific use cases such as file storage, social media platforms, and data transmission. Created by Herman Galioulline, a Computers teacher in CH who teaches grade 9-12. This quiz serves as an excellent formative assessment tool for AP Computer Science Principles students studying data representation and compression concepts. Teachers can deploy this assessment as a warm-up activity to gauge prior knowledge before diving deeper into compression algorithms, or as a review exercise following instruction on binary data representation and file formats. The quiz works particularly well as homework reinforcement, allowing students to apply their understanding of compression concepts to practical scenarios they encounter daily through social media and file sharing. It also functions effectively as a checkpoint assessment to identify students who need additional support with algorithmic thinking and data analysis concepts. This assessment aligns with AP CSP Learning Objective 2.2.3, which requires students to describe the relationship between the amount of data being transmitted and the bandwidth of the communication system, and supports the broader Big Idea 2 understanding of how data and information facilitate creative expression and communication.
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4 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following is an advantage of a lossless compression algorithm over a lossy compression algorithm?
A lossless compression algorithm can guarantee that compressed information is kept secure, while a lossy compression algorithm cannot.
A lossless compression algorithm can guarantee reconstruction of original data, while a lossy compression algorithm cannot.
A lossless compression algorithm typically allows for faster transmission speeds than does a lossy compression algorithm.
A lossless compression algorithm typically provides a greater reduction in the number of bits stored or transmitted than does a lossy compression algorithm.
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A user wants to save a data file on an online storage site. The user wants to reduce the size of the file, if possible, and wants to be able to completely restore the file to its original version. Which of the following actions best supports the user’s needs?
Compressing the file using a lossless compression algorithm before uploading it
Compressing the file using a lossy compression algorithm before uploading it
Compressing the file using both lossy and lossless compression algorithms before uploading it
Uploading the original file without using any compression algorithm
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A programmer is developing software for a social media platform. The programmer is planning to use compression when users send attachments to other users. Which of the following is a true statement about the use of compression?
Lossless compression of video files will generally save more space than lossy compression of video files.
Lossless compression of an image file will generally result in a file that is equal in size to the original file.
Lossy compression of an image file generally provides a greater reduction in transmission time than lossless compression does.
Sound clips compressed with lossy compression for storage on the platform can be restored to their original quality when they are played.
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
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.
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