AP CSP - Unit 1 Quiz

What is the hexadecimal (base 16) number 56 in the decimal system?

86

Each student that enrolls at a school is assigned a unique ID number, which is stored as a binary number. The ID numbers increase sequentially by 1 with each newly enrolled student. If the ID number assigned to the last student who enrolled was the binary number 1001 0011, what binary number will be assigned to the next student who enrolls?

1001 0100

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 times as many items can be uniquely identified.

What are the decimal numbers equivalent to 1111-1111, 1111-1111, and 1111-0000

255, 255, 240

How many times bigger is a 128-bit address than a 32-bit address?

2^96

What is the decimal number equivalent to the binary number 1001010?

74

Which of the following is NOT an advantage of using open-source software?

The original developer of open-source software provides free or low-cost support for users installing and running the software.

In a certain computer program, two positive integers are added together, resulting in an overflow error. Which of the following best explains why the error occurs?

The program can only use a fixed number of bits to represent integers; the computed sum is greater than the maximum representable value.

A musician is creating a song using audio samples. Which of the following actions will minimize the risk of a copyright violation when creating sample-based music?

Using samples published with a no-rights-reserved Creative Commons license

Which of the following can be represented by a sequence of bits?

An integer, an alphanumeric character, and a machine language instruction.

What are the three binary numbers equivalent to 75, 0, and 130 respectively?

1001011, 0, and 10000010

What are the decimal equivalents of the binary numbers 0011, 0110, and 1111?

3, 6, and 15

List the following numbers in order from least to greatest: -Binary 1011 -Binary 1101 -Decimal 5 -Decimal 12

Decimal 5, binary 1011, decimal 12, binary 1101

A researcher wants to publish the results of a study in an open access journal. Which of the following is a direct benefit of publishing the results in this type of publication?

The researcher can allow the results to be easily obtained by other researchers and members of the general public.

A user reads reviews of a popular artist's new album and then downloads the album from the Web site of a licensed online music seller. Which of the following is LEAST likely to be a consequence of this action?

The user will be in violation of the Digital Millennium Copyright Act (DMCA).

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

There are trade-offs involved in choosing a compression technique for storing and transmitting data.

Which of the following are true statements about the data that can be represented using binary sequences?

They can be used to represent strings of characters, colors, and audio recordings.

Come up with a string that cannot be shortened using byte pairing.

EX: "LEVEL_UP" As long as the string didn't have any repeating pairs of characters, the answer is correct.

Can 8 different patterns of bits be represented by 4 bits?

yes

A person wants to transmit an audio file from a device to a second device. Which of the following scenarios best demonstrates the use of lossless compression of the original file?

A device compresses the audio file before transmitting it to a second device. The second device restores the compressed file to its original version before playing it.

Which of the following is an advantage of a lossless compression algorithm over a lossy compression algorithm?

A lossless compression algorithm can guarantee reconstruction of original data, while a lossy compression algorithm cannot.

Which of the following actions is most likely to raise legal or ethical concerns?

A musician creates a song using samples of a copyrighted work and then uses a Creative Commons license to publish the song.

If a programmer tries to add decimal numbers 14 and 15 using a binary system with only four bits, what will the result be?

An overflow error will occur because 4 bits is not large enough to represent either of the values 14 or 15.

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

If a photographer is manipulating a digital image, but still wants to be able to reconstruct the image later, what can he do to to the image that is a lossless transformation of the digital image.

Creating the negative of an image by creating a new RGB triplet for each pixel in which each value is calculated by subtracting the original value from 255. The negative of an image is reversed from the original; light areas appear dark, and colors are reversed.

Which of the following best describes the impact of Creative Commons?

Creative Commons gives creators of digital content the ability to indicate how their works can be legally used and distributed, enabling broad access to digital information.

Is replacing repeating characters with single symbols and creating a mapping that pairs each pattern to the symbol a form of lossy or lossless compression and why?

Loss transformation because an encoded string can be restored to its original version.

Why would an author get a Creative Commons license for a book that they wrote?

To make it free to the public as well as allow others to use and modify the book for their own purposes.

The position of a runner in a race is a type of analog data. The runner's position is tracked using sensors. Which of the following best describes how the position of the runner is represented digitally?

The position of the runner is sampled at regular intervals to approximate the real-word position, and a sequence of bits is used to represent each sample.

A computer evaluates 2/3 as 0.6666667. What explains this result?

The precision of the result is limited due to the constraints of using a floating-point representation.

A programmer created a piece of software and wants to publish it using a Creative Commons license. Which of the following is a direct benefit of publishing the software with this type of license?

The programmer can specify the ways that other people are legally allowed to use and distribute the software.

A media librarian at a movie studio is planning to save digital video files for archival purposes. The movie studio would like to be able to access full-quality videos if they are needed for future projects. Which of the following actions is LEAST likely to support the studio's goal?

Using lossy compression software to reduce the size requirements of the data being stored