O-LevelComputer ScienceData Representation2210/12 · May/June 2017 · Q57 Marks
The denary number 57 is to be stored in two different computer registers. Convert 57 from denary to binary and show your working.
- (a)The denary number 57 is to be stored in two different computer registers. Convert 57 from denary to binary and show your working.[2]
- (b)Show the binary number from part (a) as it would be stored in the following registers. Register 1 Register 2[2]
- (c)A binary number stored in a register can have many different uses, for example an address in main memory. Give two other uses for a binary number stored in a register. Use 1 Use 2[2]
- (d)A register in a computer contains binary digits. 0 0 1 1 1 0 1 0 The contents of the register represent a binary integer. Convert the binary integer to hexadecimal.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- 5(a) 1 mark for correct method, 1 mark for correct answer 32+16+8+1 (00)111001
- 5(b) registers must have leading zeros, allow follow through from 5(a) for an incorrect value 1 mark for each correct register. Register 1: 00111001 Register 2: 0000000000111001
- 5(c) Two from: ∞ data ∞ ASCII value / Unicode value / character ∞ number ∞ part of image / small image ∞ a sound / sound sample / small sound track ∞ instruction
- 5(d) 3A
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