Data Compression Quiz CSP

What is data compression?

• A process that increases file size

• A process that reduces file size using fewer bits

• A way to delete unnecessary files

• A method of encrypting information

Why do we use data compression?

• To slow down the CPU

• To save storage space and transmission time

• To add more details to images

• To change file formats

Which of the following is a benefit of compression?

• Files load faster

• Less storage is needed

• Less bandwidth is used when sending data

• All of the above

Data compression works by:

• Replacing repeated patterns with shorter representations

• Duplicating all data

• Encrypting sensitive data

• Removing file names

Which of the following is a common compression algorithm for text with repeated patterns?

• Run Length Encoding (RLE)

• JPEG

• AES Encryption

• ASCII

When compressing and decompressing, what must always match?

• The file name

• The algorithm used

• The storage device

• The internet connection

What is the formula for space savings in compression?

• (compressed size ÷ original size) × 100

• (1 – compressed size ÷ original size) × 100

• (original size ÷ compressed size) × 100

• (compressed size – original size) × 100

A string “HHHHHH” compressed with RLE into “H6” shows what principle?

• Patterns can be replaced by shorter codes

• Compression makes data random

• All compression removes information

• Compression works only on images

Which of these file types is typically compressed?

• .zip

• .jpg

• .mp3

• All of the above

What is a trade-off in data compression?

• More storage but less quality

• Storage space vs. computation power

• Faster CPU vs. slower internet

• Quality vs. battery life