CS Final Review

Which of the following best describes how computing devices represent information?

• A computer will either represent information as bits or bytes but not both

• A computer represents data as a byte which is either a 0 or a 1

• A computer represents data as bits which is either a 0 or a 1

• A computer represents information as bits which contain 8 bytes.

Ryan is designing an app that needs to quickly send low quality photos between users. Most smartphones take much higher quality photos than Ryan needs for his app. Which answer best describes the type of compression Ryan should choose and why?

• Lossless compression since it ensures perfect reconstruction of the photo.

• Lossy compression since it typically results in smaller data sizes.

• Lossy compression since it ensures perfect reconstruction of the photo.

• Lossless compression since it typically results in smaller data sizes.

Your computer uses 4 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?

• 14

• 17

• 15

• 16

Convert the binary (base-2) number 1001 to decimal (base-10).

• 9

• 10

• 16

• 17

How many total numbers can be represented with an 8-bit binary (base-2) system?

• 255

• 127

• 128

• 256

a computing device is

• a machine that can run a program

• a group of computers working together for a common purpose

• a group of connected computers that can send or receive data

• a sequence of direct connections

a computing system is

• a group of connected computers that can send or receive data

• a group of computers working together for a common purpose

• a machine that can run a program

• a sequence of direct connections

a path is

• a group of connected computers that can send or receive data

• a sequence of direct connections

• a machine that can run a program

• a group of computers working together for a common purpose

Emilee is watching an online video. The video is being sent to her laptop by a server over the Internet which splits the video into packets and sends them in the order they appear in the video. Which of the following is true about how the packets will arrive at her computer?

• Packets that arrive out of order will be sent back to the server.

• Either every packet will reach her computer or none of them will.

• The packets may arrive out of order

• The packets will always be received in the order that they were sent

wordList is a list of words that currently contains the values ["tree", "rock", "air"]

Which of the following lines will result in the list containing the values ["air", "rock", "air"]

• wordList[0] = wordList[2]

• wordList[2] = wordList[0]

• insertItem(wordList, 0, "air")

• removeItem(wordList,0)