A-LevelComputer ScienceData representation9618/12 · May/June 2024 · Q76 Marks
A computer stores binary data.
- (a)Tick (✔) one box only to identify the largest file size. 3300 kibibytes 0.3 megabytes 3 mebibytes 3300 kilobytes[1]
- (b)Subtract the denary number 10 from the denary number 100 using binary subtraction. Show your working. Working Answer[3]
- (c)Convert the hexadecimal number C0F into denary. Show your working. Working Answer[2]
Mark scheme
Marking points from the official mark scheme (May/June 2024). The mark or mark type is shown in brackets.
- [1] (a) 3300 kibibytes
- [1] (b) Converting 100 to binary 0110 0100 and 10 to binary 0000 1010
- [1] (b) Subtraction method - converting 10 to – 10 and adding // direct subtraction
- [1] (b) correct answer 0101 1010
- [1] (c) Working: 1100 0000 1111 // 2048 + 1024 + 8+4+2+1 // (12 * 16^2) + 15 // (12* 16* 16) + 15 // 3072 + 15
- [1] (c) Correct answer: 3087
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