O-LevelComputer ScienceData Representation2210/12 · Oct/Nov 2024 · Q27 Marks
Data storage can be measured using different units of measurement.
- (a)Identify the name of the smallest unit of measurement of data.[1]
- (b)State how many nibbles there are in 2 bytes.[1]
- (c)A 10 second sound effect is recorded for a movie. It is recorded with a sample rate of 22,016 Hz and a sample resolution of 8 bits. Calculate the file size of the sound effect in kibibytes (KiB). Show all your working. Answer ..................................................................................... KiB[3]
- (d)(i)The sound effect file is compressed for storage. State what is meant by file compression.[1]
- (d)(ii)Give one benefit of compressing the file for storage.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2024). The mark or mark type is shown in brackets.
- [1] 2(a) bit
- [1] 2(b) 4
- [3] 2(c) Any two from: • 22 016 x 8 then divided 8 • 22 016 × 10 • 220 160/1024 One mark for: 215 KiB
- [1] 2(d)(i) Reducing the size of a file
- [1] 2(d)(ii) It will take up/use less storage space
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