AP CSP | Q2 Exam Review by Mr. Benvenuto"

The following is a true or false statement about data compression. Public key encryption is an encryption method that relies on separate keys for encrypting and decryption information

• True

• False

Jesse purchases a new smartphone and is immediately able to use it to send a photo over the Internet to a friend who lives in a different country. Which of the following is NOT necessary to make this possible?

• Both devices are using the same shared and open protocols

• A single direct connection is established between any two devices connected to the Internet

• The data of the image is routed through a sequence of directly connected devices before arriving

  at its destination.

• Both devices are directly connected to at least one part of the Internet

What is the minimum number of bits you would need to encode the 26 letters of the alphabet plus a space, for a total of 27 characters?

• 4 bits

• 5 bits

• 6 bits

• 7 bits

A raw digital sound file samples a sound wave at some interval and measures the height of the wave at each point. Thus, raw sound is recorded as a list of numbers. In very broad terms the MP3 audio compression algorithm identifies frequencies and volume levels - low and high - that is outside the range of human hearing and removes the data representing these frequencies from the original. This technique results in a smaller audio file that sounds the same to the human ear. This technique is an example of what type of compression.

• Lossless transformation

• Lossless compression

• Computer D

• Lossy compression

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

• 01010, 1110, 01000

• 1,000 times bigger

• Lossy compression

• 2^32 times as many values can be represented

The colors of the pixels in a digital image are often represented by red, green, and blue values between 0 and 255 (an RGB triplet). A photographer is manipulating a digital image to lighten it because all the RGB values in the image are less than 100, making it very dark. He does this b adding 20 to the R, G, and B values of each pixel, then overwriting the original image. What type of transformation is the photographer using on the digital image?

• Lossless transformation

• Lossy compression

• Lossless compression

• JPEG File

A user clicks on a website, and it begins to load immediately, but it takes a long time to load completely, and pictures appear slowly one by one. Which of the following is demonstrated through this situation?

• JavaScript is not updated

• Software inadequacies

• Poor pictures resolution

• Low bandwidth, low latency

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

• 1010

• 1001

• 1100

• 0011

Consider the following 3 binary numbers: 01000, 010000, 11110. Which of the following lists the numbers in order from least to greatest?

• 01010, 1110, 01000

• 1000, 01010, 1110

• 1110, 01010, 1000

• None of the above

(True or False) When it comes to Counting in Binary, numbers are represented with different symbols, and There’s a set order, and that order matters

• True

• False