(a) State how many bytes there are in 3 kilobytes. [1]
(b) In ASCII the character 'D' is represented by the denary code 68. State the denary ASCII code for 'H'. [1]
(c) Explain one advantage of using Unicode instead of ASCII. [2]
- (a) 3000 (AQA: 1 kilobyte = 1000 bytes)(1)
- (b) 72(1)
- (c) Unicode uses more bits per character / has a much larger character set; allow can represent more (different) characters(1)
- (c) So it can represent characters from many / all different languages / alphabets, and symbols such as emoji; allow ASCII (7-bit) is limited to 128 characters, mainly English(1)
- Answer: (a) 3000 (b) 72 (c) Unicode can represent far more characters, e.g. other alphabets and emoji
- Examiner tip: Character codes are sequential – count on from the letter you are given rather than memorising codes.