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 fewer bits per second than the original song.

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.

Which of the following describes a lossless transformation of a digital image? - Compressing the image in a way that may lose information but will suffer only a small loss of image quality. - Creating the gray scale of an image by averaging the amounts of red, green, and blue in each pixel and assigning this new value to the corresponding pixel in the new image. The new value of each pixel represents a shade of gray, ranging from white to black. - 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. - Modifying part of the image by taking the pixels in one part of the picture and copying them to the pixels in another part of the picture.

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.

What is the point of binary?

It represents how computers interpret electrical signals.

the smallest unit of data in a computer.

The way computers talk to each other

How is our number system different from the binary system?

Our number system is base-10; the binary system is base-2

Which of the following is NOT true about representing digital data? At one of the lowest levels of abstraction, all digital data can be represented in binary using only combinations of the digits zero and one. The same value (number) can have a different representation depending on the number system used to represent it. Groups of bits can be used to represent abstractions, including but not limited to numbers and characters. Some large numbers cannot be represented in binary and can only be represented in decimal.

Some large numbers cannot be represented in binary and can only be represented in decimal.

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.

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

A video-streaming Web site uses 32-bit integers to count the number of times each video has been played. In anticipation of some videos being played more times than can be represented with 32 bits, the Web site is planning to change to 64-bit integers for the counter. Which of the following best describes the result of using 64-bit integers instead of 32-bit integers?

2^32 times as many values can be represented.

Computer Science Principles Review Unit 1 Flashcards

Student preview

42 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Which decimal (base-10) value is equivalent to the binary (base-2) value 101001?

Back

41

2.

FLASHCARD QUESTION

Front

The smallest unit of information is

Back

a bit

3.

FLASHCARD QUESTION

Front

The smallest visual element on a video monitor is called what?

Back

Pixel

4.

FLASHCARD QUESTION

Front

A single unit of information represented by a 1 or 0...

Back

Bit

5.

FLASHCARD QUESTION

Front

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

Back

1,000 times bigger

6.

FLASHCARD QUESTION

Front

What is the 4-bit binary number for the decimal number Ten (10)?

Back

1010

7.

FLASHCARD QUESTION

Front

What is the decimal equivalent of 11010011?

Back

211

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