APCSP DAT-1.D Data Compression

What is the primary benefit of data compression?

• It increases processing speed

• It reduces the size of data for storage or transmission
  
  

• It removes unnecessary data permanently

• It eliminates the need for encryption

Data compression reduces the number of bits in a file. Does this always mean that information is lost?

• Yes, because compression always removes unnecessary data

• No, because lossless compression ensures full data recovery

• Yes, because all compression techniques introduce approximations

• No, because fewer bits always mean less information

The effectiveness of a data compression algorithm depends on:

• The processing speed of the computer

• The amount of redundancy in the original data

• The type of software used to open the file

• The storage capacity of the device

Lossless compression is most useful in which of the following situations?

• Storing images on a website

• Streaming low-resolution videos

• Compressing text documents

• Sending audio messages over a network

Which of the following statements about lossless compression is true?

• It results in a smaller file size than lossy compression

• It allows perfect reconstruction of the original data

• It does not remove redundancy from the data

• It is used primarily for audio and video files

Lossy compression is typically used when:

• Exact reconstruction of the original data is required

• Data integrity must be preserved at all costs

• Storage and transmission efficiency is prioritized over perfect accuracy

• Data security is the main concern

Which type of compression can result in a permanent loss of information?

• Lossless compression

• Lossy compression

• Both lossless and lossy compression

• Neither lossless nor lossy compression

What is a key difference between lossless and lossy compression?

• Lossless compression can only be applied to images, while lossy compression works on all file types

• Lossy compression removes data permanently, while lossless compression retains all original data

• Lossy compression is always superior in reducing file size

• Lossless compression creates approximations of the original file

Which of the following is an example of lossless compression?

• JPEG image format

• MP3 audio file

• PNG image format

• MPEG video file

Which of the following is an example of lossy compression?

• GIF image format

• ZIP file compression

• MP3 audio format

• BMP image format