This exam tips covers Exam Tips - Character Sets within Character Sets for GCSE Computer Science. Revise Character Sets in Memory & Storage for GCSE Computer Science with 15 exam-style questions and 18 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 9 of 10 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 9 of 10
Practice
15 questions
Recall
18 flashcards
Exam Tips - Character Sets
Most common exam questions:
- "What is ASCII?" → Character set with 128 characters (7-bit), covers English alphabet, numbers, punctuation
- "Why use Unicode?" → Covers ALL languages and symbols (143,000+ characters), international support, emoji
- "ASCII code for 'A'?" → 65 (memorize this!)
- "Difference UTF-8 vs UTF-16?" → UTF-8 uses 1-4 bytes (efficient for English), UTF-16 uses 2-4 bytes (efficient for Asian languages)
- "How many bytes for ASCII character?" → 1 byte
Key facts to memorize:
- ASCII: 7-bit (128 characters), English only, 1 byte per character
- Extended ASCII: 8-bit (256 characters), accented letters
- Unicode: 143,859 characters, all languages, UTF-8/16/32 encodings
- UTF-8: 1-4 bytes, most common, web standard
- Common codes: 'A'=65, 'a'=97, '0'=48, space=32
Common mistakes to avoid:
- Confusing character set (Unicode) with encoding (UTF-8) - they're related but different!
- Saying ASCII is 8-bit - NO! Standard ASCII is 7-bit (128 characters)
- Thinking Unicode uses more space - depends on encoding! UTF-8 is same as ASCII for English
- Mixing up 'A' (65) and 'a' (97) - uppercase ≠ lowercase