AP CSP Unit 1 Review (code.org)

Using the Image, what character is represented by the number 68?

• A
• B
• C
• D
• E

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?

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

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

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

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

What is abstraction?

• Making a photo smaller but more pixelated
• Hiding the complexity with something simpler

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.

• Using a fixed but large number of bits can eliminate the possibility of round off error when representing numbers in binary

• Using a fixed but large number of bits, for example 128, eliminates the possibility of overflow errors.

• With a large but fixed number of bits it is possible to eliminate either round-off errors or overflow errors, but not both.

What is the Binary error that occurs when a number is too large?

• Numbers are never too large
• Counting Error
• NaN Error
• Overflow Error

There are 58 students in your class. How many bits are needed to count all the students in your class?

• 4
• 5
• 6
• 7
• 8

A Binary number has a base of _____?

• 1
• 2
• 4
• 10
• 16

Convert from Binary to Decimal: 000101

• 4
• 5
• 6
• 7

Which form of comression would you use to save data when you transmit text messages and you don't want to lose information?

• Lossless Compression
• Lossy Compression
• Reversible Encryption
• Compression Encryption

Convert from Decimal to Binary: 13

• 1101
• 1011
• 1001
• 1110
• 101001