A-LevelComputer ScienceData representation9618/12 · May/June 2023 · Q46 Marks
Data in a computer is stored in binary form.
- (a)State the number of unique binary values that can be represented in 16 bits.[1]
- (b)Give the 8-bit one's complement representation of the denary number -120. Show your working. Working Answer[2]
- (c)Convert the hexadecimal number A04 into denary. Show your working. Working Answer[2]
- (d)Show the result of a 2-place left logical shift on the binary number: 01001111[1]
Mark scheme
Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.
- [1] 2^16 // 65536
- [2] 1 mark for working; 1 mark for answer • Working: +120 = 0111 1000 • Answer: 1000 0111
- [2] 1 mark for working; 1 mark for answer • Working: A04 = (10 * 16^2) + 4 // A04 = (10 * 256) + 4 // A04 = 1010 0000 0100 • Answer: 2564
- [1] 0011 1100
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