WorksheetsSection E - 5 - Transmitting Data - Compression
Total questions: 8
Worksheet time: 4mins
What is file compression?
Choose all statements that are true.
It reduces the file size of one or more data files.
It does this by grouping files together into a single file so they are easier to send.
It can be either lossy or lossless.
It does this by deleting unwanted data from a file.
Hamzah needs to email a large file to a classmate. Why might he need to use file compression to do so?
Email services often only let you send compressed data files.
Compressed files are less likely to become corrupted when being transferred via email.
He won't need to. All email providers let you send any files you like, regardless of size.
Email services often have maximum file sizes that prevent you sending files that are too large.
What type of compression actually deletes data and cannot be decompressed?
File Compression
Lossless Compression
Lossy Compression
Archive Compression
Lossy compression is most commonly used with images, video & audio files.
True
False
Which of the following is a benefit of lossy compression over lossless?
File sizes will always be reduced, even when compressed multiple times.
File quality is not harmed, e.g. images will look exactly the same.
Files can be decompressed back to their original uncompressed form.
File sizes are usually significantly smaller.
File archive software uses lossless compression to reduce the file size of one or more data files in a folder.
True
False
How does lossy compression reduce the size of files?
Through removing redundancies by grouping repeated data together.
By removing some precision in data that humans would have difficulty to perceive.
By grouping files into a single folder, thus reducing the amount of storage needed.
By replacing blocks of data with more compact representations.
Which of the following file types use lossless compression?
JPG
PNG
MP3
ZIP
