AP Computer Science Unit 2 questions

An artist makes an RGB raster 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 hexadecimal value for Blue as a 12-bit representation.

• 00F

• F00

• 00FF

• 00FFFF

Which unit is the smallest?

• Megabyte
• Kilobyte
• Gigabyte
• Terabyte

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

• 1,000 times bigger

• 100,000 times bigger

• 1,000,000 times bigger

• 1,000,000,000 times bigger

Which of the following is a reason to use lossy compression?

• You want the compressed file to be larger than the original.

• You want the highest quality audio file possible, with no modifications.

• You want the highest quality image file possible, with no modifications.

• You want to save space and are not concerned if the file is the highest quality possible.

a problem solving approach (algorithm) to find a satisfactory solution where finding an optimal or exact solution is impractical or impossible

• Lossless Compression

• Heuristic

• Lossy Compression

• encryption

Which of the following is irreversible?

• lossy compression

• lossless compression

• abstraction

• RLI

Which of the file types is an audiofile type?

• jpg

• mp3

• png

• csv

How would you lighten the color #bcc8e1?

• +50 to each color component

• +50 to the red component

• -50 to each color component

• -50 to the red component

The color widget uses 3 bytes of metadata. The first two bytes indicate the width and height of the image. The next byte indicates the number of bits that will be used to represent color. How many bits is used to represent color given the metadata (in binary) 00001000 00001000 0001001

• 3 bits

• 6 bits

• 9 bits

• 12 bits

Which of the following statements is FALSE?

• The computer stores colors in hexadecimal

• Every color has 3 components. A red, green and a blue component.

• A bright color would be represented by a large number.

• A computer uses 3 bytes to store a single colored pixel.