O-LevelComputer ScienceData Representation2210/11 · May/June 2024 · Q35 Marks
The binary number 10100011 is stored in random access memory (RAM). A logical left shift of three places is performed on the binary number.
- (a)Give the 8-bit binary number that will be stored after the shift has taken place.[1]
- (b)Tick (✔) one box to show which statement about a logical left shift of two places is correct. A It would divide the binary number by 2. B It would multiply the binary number by 2. C It would divide the binary number by 4. D It would multiply the binary number by 4.[1]
- (c)10100011 can be stored as a two's complement integer. Convert the two's complement integer 10100011 to denary. Show all your working.[2]
- (d)The binary number is measured as a byte because it has 8 bits. State how many bytes there are in a kibibyte (KiB).[1]
Mark scheme
Marking points from the official mark scheme (May/June 2024). The mark or mark type is shown in brackets.
- [1] 3(a) 00110000
- [1] 3(b) D
- [2] 3(c) One mark for correct working Example: Flip and add; One mark for correct answer: -93
- [1] 3(d) 1024
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