APCSP - Quiz #1

A color in a computing application is represented by an RGB triplet that describes the amount of red, green, and blue, respectively, used to create the desired color. A selection of colors and their corresponding RGB triplets are shown in the following table. Each value is represented in decimal (base 10). What is the binary RGB triplet for the color indigo?

(01001011, 00000000, 10000010)

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.

The player controls in a particular video game are represented by numbers. The controls and their corresponding binary values are shown in the following table. same chart as last one The numeric values for the controls can also be represented in decimal (base 10). What is the decimal value for the jump control?

24

A store uses binary numbers to assign a unique binary sequence to each item in its inventory. What is the minimum number of bits required for each binary sequence if the store has between 75 and 100 items in its inventory?

7

An office uses an application to assign work to its staff members. The application uses a binary sequence to represent each of 100 staff members. What is the minimum number of bits needed to assign a unique bit sequence to each staff member?

7

Consider the 4-bit binary numbers 0011, 0110, and 1111. Which of the following decimal values is NOT equal to one of these binary numbers?

9

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.

A certain programming language uses 4-bit binary sequences to represent nonnegative integers. For example, the binary sequence 0101 represents the corresponding decimal value 5. Using this programming language, a programmer attempts to add the decimal values 14 and 15 and assign the sum to the variable total. Which of the following best describes the result of this operation?

An overflow error will occur because 4 bits is not large enough to represent 29, the sum of 14 and 15.

Which of the following is NOT a benefit of collaborating to develop a computing innovation?

Collaboration eliminates the need to resolve differences of opinion.

A company that develops educational software wants to assemble a collaborative team of developers from a variety of professional and cultural backgrounds. Which of the following is NOT considered a benefit of assembling such a team?

Collaboration that includes diverse backgrounds and perspectives can eliminate the need for software testing.

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

Digital images are often represented by the red, green, and blue values (an RGB triplet) of each individual pixel in the image. A photographer is manipulating a digital image and overwriting the original image. Which of the following describes 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.

Consider the following numeric values. Binary 1011 Binary 1101 Decimal 5 Decimal 12 Which of the following lists the values in order from least to greatest?

Decimal 5, binary 1011, decimal 12, binary 1101

A video game character can face toward one of four directions: north, south, east, and west. Each direction is stored in memory as a sequence of four bits. A new version of the game is created in which the character can face toward one of eight directions, adding northwest, northeast, southwest, and southeast to the original four possibilities. Which of the following statements is true about how the eight directions must be stored in memory?

Four bits are enough to store the eight directions.

Three students in different locations are collaborating on the development of an application. Which of the following strategies is LEAST likely to facilitate collaboration among the students?

Having all three students write code independently and then having one student combine the code into a program

Which of the following actions are generally helpful in program development? 1.Consulting potential users of the program to identify their concerns 2.Writing and testing small code segments before adding them to the program 3.Collaborating with other individuals when developing a large program

I, II, and III

A computer program uses 4 bits to represent nonnegative integers. Which of the following statements describe a possible result when the program uses this number representation? I. The operation 4+8 will result in an overflow error. II. The operation 7+10 will result in an overflow error. III. The operation 12+3 will result in an overflow error.

II only

Which of the following best describes one of the benefits of using an iterative and incremental process of program development?

It helps programmers identify errors as components are added to a working program.

A color in a computing application is represented by an RGB triplet that describes the amount of red, green, and blue, respectively, used to create the desired color. A selection of colors and their corresponding RGB triplets are shown in the following table. Each value is represented in decimal (base 10). According to information in the table, what color is represented by the binary RGB triplet (11111111, 11111111, 11110000) ?

Ivory

ASCII is a character-encoding scheme that uses 7 bits to represent each character. The decimal (base 10) values 65 through 90 represent the capital letters A through Z, as shown in the table below. What ASCII character is represented by the binary (base 2) number 1001010 ?

J

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?

Lossy compression of an image file generally provides a greater reduction in transmission time than lossless compression does.

In which of the following situations would it be most appropriate to choose lossy compression over lossless compression?

Storing music files on a smartphone in order to maximize the number of songs that can be stored

A program developed for a Web store represents customer account balances using a format that approximates real numbers. While testing the program, a software developer discovers that some values appear to be mathematically imprecise. Which of the following is the most likely cause of the imprecision?

The account balances are represented using a fixed number of bits, resulting in round-off errors.

A video-streaming Web site keeps count of the number of times each video has been played since it was first added to the site. The count is updated each time a video is played and is displayed next to each video to show its popularity. At one time, the count for the most popular video was about two million. Sometime later, the same video displayed a seven-digit negative number as its count, while the counts for the other videos displayed correctly. Which of the following is the most likely explanation for the error?

The count for the video became larger than the maximum value allowed by the data type used to store the count.

A computer program performs the operation 2/3 and represents the result as the value 0.66666667. Which of the following best explains this result?

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

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 binary number is to be transformed by appending three 0s to the end of the number. For example, 11101 is transformed to 11101000. Which of the following correctly describes the relationship between the transformed number and the original number?

The transformed number is 8 times the value of the original number.

A company that develops mobile applications wants to involve users in the software development process. Which of the following best explains the benefit in having users participate?

Users can provide feedback that can be used to incorporate a variety of perspectives into 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

The player controls in a particular video game are represented by numbers. The controls and their corresponding binary values are shown in the following table. ControlBinary Value←01000 ↑01001 →01011 ↓01111 Jump 11000 Run11001 Pause11011 Reset11111 The numeric values for the controls can also be represented in decimal (base 10). What control is represented by the decimal value 15 ?

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