iGCSE Compression

iGCSE Computer Science - Compression

by Kieran Haren

Open Ended

What does compression mean?

Multiple Choice

Makes the file smaller by deleting parts of the file permanently (forever)

• Lossy Compression
• Lossless Compression

Multiple Choice

Makes the file smaller by giving repeated patterns/colours a specific code

• Lossy Compression
• Lossless Compression

Multiple Choice

What would you use compression for?

• Making an image file smaller
• Modifying an image 

Multiple Choice

Lossless compression permanently deletes the data

• True

• False

Multiple Choice

Lossy compression would be suitable for text files

• True

• False

Multiple Choice

There are _____ different types of compression

• 2

• 3

• 4

Multiple Select

Select the advantages for lossy compression

• Makes the file much smaller

• Will send much quicker

• A very simple algorithm

• The quality will not be affected much

Multiple Select

Select the advantages for lossless compression

• Makes the file much smaller

• Will send quicker

• A very simple algorithm

• The quality will not be affected much

Multiple Choice

What is compression?

• To convert one file to another
• To reduce the size of data to save space
• To minimize the time taken for a file to be downloaded
• To compress something by pressing it very hard

Multiple Choice

Compression in general makes it _______ to send, upload and stream data

• Quicker

• Slower

Multiple Choice

JPEG stands for...

• Joint Photo Exempted Grade
• Joint Photographic Experts Group
• Junior Photographic Export Group

Multiple Choice

Uncompressed audio and video files require less memory than compressed files....

• True
• False

Multiple Choice

Which of the following are not in a compressed format?

• JPEG
• MPEG
• Bitmap
• MP3

Multiple Choice

Compression looks for _______ data

• Unnecessary

• Repeated

Multiple Choice

Which of the following would not be suitable for Lossy Compression?

• Images

• Sounds

• Videos

• Text