Compression, Encryption & Hashing (OCR A-Level Computer Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
What is compression in computing?
What is compression in computing?
A process to reduce file size
What are the two main types of compression?
What are the two main types of compression?
Lossy and lossless
What happens to data removed during lossy compression?
What happens to data removed during lossy compression?
It is permanently removed
Which format uses lossy compression for images?
Which format uses lossy compression for images?
JPEG
What compression ratio does lossy compression achieve?
What compression ratio does lossy compression achieve?
High (fraction of original size)
Why is lossy compression unsuitable for text files?
Why is lossy compression unsuitable for text files?
Data loss could compromise integrity
What is a key feature of lossless compression?
What is a key feature of lossless compression?
No data is lost
Which format uses lossless compression for audio?
Which format uses lossless compression for audio?
FLAC
Can lossless compressed files be restored exactly?
Can lossless compressed files be restored exactly?
Yes, to exact original state
What is a drawback of lossless compression?
What is a drawback of lossless compression?
Lower compression ratios than lossy
Which compression should be used for text documents?
Which compression should be used for text documents?
Lossless (e.g., ZIP)
Which compression is best for streaming music and video?
Which compression is best for streaming music and video?
Lossy (e.g., MP3/MP4)