AP CSP Unit 2: Chapter 1 Quiz

Under which of the following conditions is it most beneficial to use a heuristic approach to solve a problem?

• When the problem can be solved in a reasonable time and an approximate solution is acceptable 
• When the problem can be solved in a reasonable time and an exact solution is needed
• When the problem cannot be solved in a reasonable time and an approximate solution is acceptable 
• When the problem cannot be solved in a reasonable time and an exact solution is needed

Which file type is lossy compressed sound?

• mp4
• mp3
• wav
• wma

Which type of compression do zip files use? 

• Lossy
• Lossless
• Non-compressed

Which unit is the smallest?

• Megabyte
• Kilobyte
• Gigabyte
• Terabyte

Which unit is the largest?

• Exabyte
• Terabyte
• Gigabyte
• hectobyte

Which of the following is NOT an example of metadata for an image file?

• Size of the image
• Date the image was create
• Image resolution
• Copy of each image pixel

Which file type best describes uncompressed sound? 

• wav
• mp3
• png
• zip

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 of the R = 98 G = 72 B = 33  (values in the image are less than 100), making it very DARK. He does this by 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 transformation 
•  Multiband transformation 
• Chrome Sampling transformation 

Which of the following is a true statement about 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 state. 
• 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. 

A video-streaming Web site uses 32-bit integers to count the number of times each video has been played. In anticipation of some videos being played more times than can be represented with 32 bits, the Web site is planning to change to 64-bit integers for the counter. Which of the following best describes the result of using 64-bit integers instead of 32-bit integers?

•  2 times as many values can be represented. 
•  32 times as many values can be represented. 
• 2^32 times as many values can be represented. 
• 32^2 times as many values can be represented.