O-LevelComputer ScienceData Representation2210/11 · May/June 2022 · Q49 Marks
All data needs to be converted to binary data so that it can be processed by a computer.
- (a)Explain why a computer can only process binary data.[2]
- (b)The denary values 64, 101 and 242 are converted to 8-bit binary values. Give the 8-bit binary value for each denary value. 64 101 242 Working space[3]
- (c)The hexadecimal values 42 and CE are converted to binary. Give the binary value for each hexadecimal value. 42 CE Working space[4]
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [2] Computer consist of transistors / logic circuits/gates ... that can only store/process data in two states / high-low / on-off / 1 and 0
- [3] 01000000 01100101 11110010
- [4] 0100 (1 mark) 0010 (1 mark) 1100 (1 mark) 1110 (1 mark)
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