Lesson 1-Data Storage N Compression

What is the main purpose of data compression?

• To permanently delete data
• To reduce the size of a file
• To improve image quality
• To increase file size

Answer explanation

Jupiter is a gas giant made primarily of hydrogen and helium. Unlike terrestrial planets that have solid surfaces, gas giants like Jupiter don't have a well-defined solid surface, allowing them to accumulate more mass in a gaseous form. This composition has allowed Jupiter to grow significantly larger than planets with solid surfaces.

Which of the following is an example of a lossless compression technique?

• MP3
• JPEG
• Run Length Encoding (RLE)
• GIF

What happens in lossy compression?

• No data is lost
• Data is lost permanently
• Data can be restored exactly as the original
• Data size increases

Why is data compression important when streaming videos or music?

• It increases download time
• It reduces the amount of data transmitted
• It improves video quality
• It decreases buffering

Which file format uses lossy compression?

• PNG
• FLAC
• MP3
• TIFF

In run length encoding (RLE), what does the frequency/data pair represent?

• The original image
• The number of bits needed
• A sequence of repeated data
• The compression ratio

What is a common consequence of lossy compression in images or videos?

• Digital artefacts like noise and blocks
• Perfect image restoration
• Higher resolution images
• Lower download speeds

How does reducing resolution or color depth in images affect the file size?

• It increases file size
• It decreases file size
• It has no effect on file size
• It improves image quality

Which of the following file formats uses lossless compression for simple images?

• JPEG
• PNG
• MP4
• ZIP

When is lossless compression most appropriate?

• For compressing computer programs
• For compressing video files
• For compressing music tracks
• For compressing low-quality images