Worksheets1.2.2 2025 - Compression & characters
Total questions: 16
Worksheet time: 9mins
What is a character set?
A type of software
A set of symbols that can be represented by a computer
A computer hardware component
A programming language
What languages does the ASCII character set cover?
Only English letters
English and American letters, numbers, and symbols
All languages
Only numbers
How many bits are used to store a single ASCII character?
16 bits
32 bits
7 or 8 bits
64 bits
What languages does the UNICODE character set cover?
Only English
Only numbers
Letters, symbols, and numbers from ALL languages
Only symbols
How many bits are used to store a single UNICODE character?
8 bits
16 bits
32 bits
64 bits
What is metadata?
Data about data
A type of file
A programming language
A computer virus
Which TWO of the following is an example of metadata?
Image Resolution
Geo Location of photo
Youtube video link URL
Folder location on a PC
How does lossy compression work?
It breaks the data into small packets so that you dont need all of them
It removes unnecessary / unoticable data, reducing file size
It creates instructions to re-create a file
It encrypts data
How does lossless compression work?
It breaks the data into small packets so that you dont need all of them
It removes unnecessary / unoticable data, reducing file size
It creates instructions to re-create a file
It encrypts data
What effect does lossy compression have on a file?
File size increases
File size remains the same
File size gets smaller; quality is reduced
File size gets larger; quality is improved
On which TWO of the following can lossy compression be used?
Images
Text
Executable files
Audio
What effect does lossless compression have on a file?
File size increases
File size remains the same
File size gets smaller; quality remains the same
File size gets larger; quality is reduced
What effect does lossy compression have on a file?
File size increases
File size remains the same
File size gets smaller; quality remains the same
File size gets smaller; quality is reduced
On which of the following can lossy compression NOT be used?
Images
Text
Audio
What is an example of a metadata?
Geolocation of an image
Location on a PC
URL address
File Extension
What is the size comparison between UNICODE and ASCII files?
UNICODE is half the size of ASCII
UNICODE is the same size as ASCII
UNICODE is 3 times the size of ASCII
UNICODE is 10 times the size of ASCII
