O-LevelComputer ScienceData Representation2210/12 · May/June 2016 · Q94 Marks
In the following barcode, each binary number is made up of seven bars. Each bar is black or grey. A black bar is interpreted as a “1” and a grey bar is interpreted as a “0”. [Diagram of barcode]
- (a)Write the binary numbers that would be produced from this barcode: Binary number A: Binary number B:[2]
- (b)This barcode system uses odd parity. Write the parity bit for each of the binary numbers in part (a): Parity bit Binary number A: Binary number B:[2]
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Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [2] 9 (a) Binary number A: 1 1 1 0 0 1 0 Binary number B: 1 0 0 1 1 1 0
- [2] (b) Parity Bit Binary number A: 1 Binary number B: 1
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