O-LevelComputer ScienceData Representation2210/12 · May/June 2022 · Q15 Marks
Denary values are converted to binary values to be processed by a computer.
- (a)Draw one line from each denary value to the correctly converted 8-bit binary value. Denary 41 174 86 8-bit binary 00100001 10100110 00101001 10000110 10101110 01010110 Working space[3]
- (b)Binary values can also be converted to denary values. Give the correct denary value for the 12-bit binary value 000101010111 Show all your working. Denary value[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [1] 41 to 00101001
- [1] 174 to 10101110
- [1] 86 to 01010110
- [1] Working e.g. 256 + 64 + 16 + 4 + 2 + 1
- [1] Answer: 343
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