AP CSP Final Review Part 1

Which value is greatest?

• Decimal 100

• Binary 100

• Decimal 256

• Binary 1111 1111

What is the best explanation for why digital data is represented in computers in binary?

• The binary number system is the only system flexible enough to allow for representing data other than numbers.

• It's easier, cheaper, and more reliable to build machines and devices that only have to distinguish between binary states.

• It typically takes fewer digits to represent a number in binary when compared to other number systems (for example, the decimal number system)

• It's impossible to build a computing machine that uses anything but binary to represent numbers

Convert 1111 to decimal

• 16

• 4

• 5

• 15

An image compression technique removes pixels with color differences that are difficult for the human eye to detect. This type of compression is

• lossless
• lossy
• brute force
• computationally hard

Number systems with different bases such as binary (base-2) and decimal (base-10) are all used to view and represent digital data.

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.

What is the largest value you can represent with three bits?

• 3

• 6

• 7

• 8

What is the greatest decimal value you represent with 4 bits?

• 4

• (2^4-1) or 8

• (2⁴ - 1) or 15

• (2⁴) or 16

Which of the following is TRUE regarding 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 size.

• 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.

What is lossless compression?   

• A) Shrinking data and losing some of it
• B) Making the code less efficient
• C) Shrinking data without losing any of it
•  D) Expanding a set of data via aggregation

How many more values can you represent if you add one bit?

• One more value

• You can't predict this

• Double the amount of values