Data Compression (AQA GCSE Computer Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What are the two main problems caused by large digital files?
What are the two main problems caused by large digital files?
Storage issues and transmission problems
How large can a single photo from a modern smartphone be?
How large can a single photo from a modern smartphone be?
10-20MB
How much storage can just a few minutes of 4K video consume?
How much storage can just a few minutes of 4K video consume?
Over 1GB
What is the file size of 1 minute of audio at 44.1 kHz with 16-bit resolution?
What is the file size of 1 minute of audio at 44.1 kHz with 16-bit resolution?
5.29 MB
What does lossy compression do to the original file?
What does lossy compression do to the original file?
Permanently removes some data
What does lossy compression remove from sound files?
What does lossy compression remove from sound files?
Very high or low frequencies
What does lossy compression do to images?
What does lossy compression do to images?
Combines similar colours or removes detail
Can you reverse lossy compression to restore the original quality?
Can you reverse lossy compression to restore the original quality?
No, it cannot be reversed
What is the key feature of lossless compression?
What is the key feature of lossless compression?
Can recreate original file exactly
When is lossless compression essential?
When is lossless compression essential?
Computer programs and text documents
What is the key difference between lossy and lossless compression?
What is the key difference between lossy and lossless compression?
Lossy loses quality, lossless doesn't
What type of compression do music streaming services like Spotify use?
What type of compression do music streaming services like Spotify use?
Lossy compression