ap csp unit 1
When 8 bits per color channel are used (24 bit per pixel), that allows for how many gradations of color within that channel?
255
Given three shapes, circles, squares, and triangles, how many unique three place value patterns can be created?
27
Which of the following is NOT true of how computers represent complex information?
Abstraction helps represent complex information by surfacing complexity that might otherwise be hidden
Which of the following is true of how computers represent numbers?
With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors.
What is the largest binary number you can write given you have four bits? Convert this to decimal (base ten).
15
What is true of a lossless compression? Select TWO.
-Lossless compression is fully reversible, meaning the original file can be recreated bit for bit. -Lossy usually has a larger compression than lossless.
What is true of a lossy compression? Select TWO.
-Lossy compression is NOT fully reversible, the original file is not capable of being recreated from the lossy compression file. -Lossy compression throws away unimportant details that a human being will likely be unable to detect.
Which of the following is true of lossy and lossless compression techniques?
-Lossy compression is best suited for situations where some loss of detail is tolerable, especially if it will not be detectable by a human.
Assume your friend just sent you 32 bits of pixel data (just the 0s and 1s for black and white pixels) that were encoded after sampling an image. Choose the two statements that are true.
-The fact that only 32 bits were used to represent the image indicates relatively large sample squares were used. The digital image may vary from the analog image significantly. -The correct width and height must be input into the pixelation widget to produce the image.
Sampling is
-The more the sampling the more the digitized display will look like the analog display. -Sampling is a step used in converting an analog signal to a digital signal.
Which of the following can be represented by a single binary digit Select two answers.
-The remainder when dividing a whole number by 2 -The value of a Boolean variable
Metadata is
-data like the width and height of an image. -data about the data.
Intellectual Property
-is protected be copyright laws. -refers to creations of the mind, such as inventions; literary and artistic works; designs; and symbols, names and images used in commerce. -enables people to earn recognition or financial benefit from what they invent or create.
An artist makes an RGB image in which each pixel color is encoded with 12-bits --- 4 bits each for red, green and blue. Which of the following correctly shows the binary value for Green as a 12-bit representation?
000011110000
Using 2 bits for each color, red, green, and blue. This will be 6 bits total for each pixel. Which will give the brightest shade of red?
110000
Convert 7 in decimal (base ten) to binary.
111
A video-streaming Website uses 3-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 6 bits, the Web site is planning to change to 6 - bit integers for the counter. Which of the following best describes the result of using 6-bit integers instead of 3-bit integers? i.e. How much more information can be stored using 6 bits rather than 3 bits?
2^3 times as many values can be represented.
Two students are sending messages to one another using a 5-bit protocol. They decide to modify their protocol to 7-bit messages. How many move values can be represented in a 7-bit message than a 5-bit message?
4 times as many
Encoding each color channel with 3 bits per channel allows for many gradations of colors in a composition. For example, bright red would be represented as 111000000. With three bits per color, how many gradations of red are possible (not including 000000000, which is black).
7
Translate the Binary number into Decimal (Base Ten) : 01001101
77
How many bits are necessary to convert 128 from decimal (base ten) to binary (base two)?
8
Your computer uses 3 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, if you only have 3 bits?
8
If Person A takes a photo with their phone and posts it on line and Person B finds the photo and posts it on their website with an attached Creative Common license, Person B now owns the photo.
False. Person A owns the photo because they created the photo.
Which of the following is a true statement about data compression?
There are pros and cons involved in choosing lossless or lossy compression technique for storing and transmitting data.
Creative Commons license
It allows others to share and reuse your work if they pay you first
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
I go to cheapoMusic to download a song. The site uses an algorithm that compresses the song by using the first refrain from the original song every time the refrain is sung. This is an example of
Lossy Compression
Order from least to greatest.
bits, bytes, megabytes, gigabytes.
