AP CSP Unit 1 Test Review

AP CSP Unit 1 Test Review

​

Multiple Choice

Which of the following best describes how computing devices represent information?

• A computer represents information as bits which contain 8 bytes.

• A computer represents data as bits which is either a 0 or a 1

• A computer will either represent information as bits or bytes but not both

• A computer represents data as a byte which is either a 0 or a 1

Multiple Choice

Which of the following is NOT true of how computers represent complex information?

• Depending on context the same sequence of bits may represent different types of information

• Common abstractions that are represented by computing devices include numbers, characters, and color.

• Computing devices use patterns of bits to represent complex information

• Abstraction helps represent complex information by surfacing complexity that might otherwise be hidden

Multiple Choice

When visiting a museum Sue takes a photo of a painting with a smartphone which stores the photo as an image file. Which of the following best describes the differences between the painting itself and the photo of the painting stored on the smartphone?

• Both the painting and the photo are analog

• The phone can represent the photo in either digital or analog formats depending on the sampling technique that is used

• The photo is a digital representation of the analog painting

• Sampling can be used to determine whether the analog image is an accurate representation of the painting

Multiple Choice

Your computer uses 5 bits to represent decimal numbers (0, 1, 2, 3 and so on) in binary. What is the SMALLEST number for which an overflow error occur?

• 30

• 31

• 32

• 33

Multiple Choice

Which of the following is true of how computers represent numbers?

• Using a fixed but large number of bits, for example 128, eliminates the possibility of overflow errors.

• With a large but fixed number of bits it is possible to eliminate either round-off errors or overflow errors, but not both.

• With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors.

• Using a fixed but large number of bits can eliminate the possibility of round off error when representing numbers in binary

Multiple Choice

Which of the following is true of lossy and lossless compression algorithms?

• Lossy compression algorithms are used when perfect reconstruction of the original data is important.

• Lossless compression algorithms are only used to compress text data.

• Lossless compression algorithms only allow for an approximate reconstruction of the original data.

• Lossy compression algorithms are typically better than lossless compression algorithms at reducing the number of bits needed to represent a piece of data.

Multiple Choice

Jorge is sending a large image file to a friend as part of a shared classroom project. Which of the following is most likely true if Jorge opts to compress the image before sending it?

• The image will require fewer bits in order to be represented.

• The image will require more pixels to display it on the screen.

• The image can no longer be represented using bits.

• The image will have been converted into an analog form.

Multiple Choice

Which of the following is true of intellectual property?

• Information created on a computer is not owned by anyone since only analog information is protected under copyright law.

• Creative Commons has severely hindered broad and open access to digital information

• You do not need to cite work created by someone else if both the original work and your use of it are in digital form.

• Creative Commons enables content creators to freely distribute their otherwise copyrighted work.

Multiple Choice

Lucy is completing a project as part of a science class using materials she found online. Which of the following is MOST LIKELY to lead to legal consequences?

• Modifying a piece of open source software.

• Failing to publish her work under a Creative Commons license

• Using images posted online by another student without permission or citation.

• Using open access research for which she does not acquire a license.

Multiple Choice

Ryan is designing an app that needs to quickly send low quality photos between users. Most smartphones take much higher quality photos than Ryan needs for his app. Which answer best describes the type of compression Ryan should choose and why?

• Lossy compression since it ensures perfect reconstruction of the photo.

• Lossless compression since it ensures perfect reconstruction of the photo.

• Lossless compression since it typically results in smaller data sizes.

• Lossy compression since it typically results in smaller data sizes.

Multiple Choice

Lisa takes a picture with her smartphone which she subsequently posts online. Allen finds the picture online and posts a copy of it on his website with an attached Creative Commons license. Which of the following best describes who owns the photo?

• Allen owns the photo because only holders of a Creative Commons license can own works online.

• Lisa owns the photo because it was granted a Creative Commons license by another person online.

• Lisa owns the photo because she was the original creator and did not license the work.

• Both own the photo because creating a copy makes it her intellectual property.

Multiple Choice

Which of these binary (base-2) numbers is the smallest?

• 1000 0001

• 1100 0001

• 0110 0110

• 0001 1111

Multiple Choice

How many numbers can be represented with an 8-bit binary system?

• 255

• 256

• 128

• 127