Understanding Data Compression and Encryption

Which of the following best describes the main reason for using data compression when transferring files over the Internet?

• To increase the file size for better quality

• To reduce the amount of data that needs to be transmitted

• To make files more difficult to open

• To change the file format

Which type of compression permanently removes some data from the original file?

• Lossless compression

• Lossy compression

• Symmetric encryption

• Asymmetric encryption

Which of the following is a benefit of lossless compression?

• The original data can be perfectly reconstructed

• The file size is always smaller than with lossy compression

• Some data is lost, but the quality is improved

• It is only suitable for images

Which of the following is a drawback of lossy compression?

• The process is very slow

• The original data cannot be perfectly restored

• It increases the file size

• It is not suitable for images

Which scenario is most appropriate for using lossless compression?

• Compressing a music file for streaming

• Compressing a text document containing important data

• Compressing a photograph for a website

• Compressing a video for YouTube

Which of the following is a common use for lossy compression?

• Archiving legal documents

• Storing high-quality medical images

• Streaming audio and video files

• Compressing executable program files

What is the main advantage of using compression algorithms when storing files?

• Files become easier to edit

• Files take up less storage space

• Files are more secure

• Files are converted to a different format

Which of the following best describes run-length encoding (RLE)?

• Replacing repeated sequences with a single value and count

• Encrypting data using a public key

• Removing all vowels from a text file

• Converting text to binary

In which type of file would run-length encoding be most effective?

• A file with lots of random data

• A file with long runs of repeated characters or pixels

• A file containing only numbers

• A file with encrypted data

Which of the following is true about dictionary coding?

• It replaces repeated data with a unique code from a dictionary

• It only works on image files

• It increases the file size

• It is a type of encryption