H446_4_DB_Compression Quiz

What is the primary purpose of file compression?

• To increase the file size

• To reduce the storage space of files on disk

• To enhance the quality of images

• To slow down data transmission

What is the difference between lossy and lossless compression?

• Lossy compression retains all information, lossless removes unnecessary information

• Lossy compression removes non-essential information, lossless retains all information

• Both remove all information

• Both retain all information

Why is compression important for images on websites?

• To make images look more colorful

• To enable a web page to load quickly

• To increase the file size

• To reduce the number of images

What is a consequence of lossy compression on images?

• Improved image quality

• Increased file size

• Displaying untidy and blocky compression artefacts

• Faster data transmission

What type of compression is likely to be used for the following: a website image, a zipped file of long text documents and images, a PDF instruction manual?

• Lossy compression

• Lossless compression

• Run Length Encoding

• MP3 compression

What is the main advantage of lossless compression?

• It reduces file size significantly

• It maintains exact accuracy with no data loss

• It is faster to process than lossy compression

• It is used for audio files

What does Run Length Encoding (RLE) primarily record?

• Every pixel in a sequence

• The value and number of times a pixel repeats

• Only the color of each pixel

• The position of each pixel

In the context of the document, what is a common use of MP3 files?

• Storing high-quality images

• Compressing video files

• Reducing audio file size

• Encoding text documents

What is the main advantage of dictionary-based compression techniques?

• It eliminates the need for encryption.

• It reduces the size of the message significantly.

• It increases the complexity of the message.

• It requires more storage space.

In the context of encryption, what is the term for the original data or message?

• Ciphertext

• Key

• Plaintext

• Algorithm