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AQA GCSE Computer Science
3.3 Fundamentals of data representation
3.3.5 Character encoding
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Cards (28)
What is character encoding used for?
Representing text numerically
What type of characters does ASCII primarily cover?
English alphanumeric
The letter 'A' is encoded as
65
in ASCII.
Why is character encoding essential for computers?
Standardized text processing
The ASCII encoding standard uses
7
bits to represent each character.
UTF-8 is backward compatible with ASCII.
True
Why is UTF-8 often preferred over Unicode?
Backward compatibility
The letter 'A' is encoded as 65 in
ASCII
and U+0041 in Unicode.
Match the encoding standard with its key characteristics:
ASCII ↔️ Uses 7 bits, limited language support
Unicode ↔️ Extensive characters from most languages
How many bits does Unicode use to represent characters?
16
Order the following encoding standards by their range of supported characters:
1️⃣ ASCII
2️⃣ Unicode
ASCII uses
7
bits to encode characters.
UTF-8 is backward compatible with
ASCII
.
UTF-8 uses a variable-length encoding for characters.
True
The ASCII encoding standard uses a range of
0-127
Unicode supports over
one million
characters and symbols.
True
Match the encoding standard with its range:
ASCII ↔️ 0-127
Unicode ↔️ 0-1,114,111
Unicode
ensures that the same character appears correctly across different platforms.
True
What is one key benefit of Unicode compared to ASCII?
Comprehensive language support
Match the encoding standard with its key characteristic:
ASCII ↔️ Basic English text
Unicode ↔️ Comprehensive character coverage
UTF-8 ↔️ Variable-length encoding
What is the maximum number of characters supported by Unicode?
1,114,111
Character encoding is a method used to represent text characters and symbols as
numeric codes
for computers to understand them.
True
In ASCII, the letter 'A' is encoded as the number
65
The encoding of 'A' is consistent across ASCII and Unicode.
True
What is one major benefit of Unicode?
Comprehensive language support
Match the encoding standard with its example:
ASCII ↔️ "A" is 65
UTF-8 ↔️ "€" is 0xE2 0x82 0xAC
Which encoding standard is primarily used for English text?
ASCII
UTF-8 balances coverage and efficiency, and is compatible with
ASCII
.
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