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O-LevelComputer ScienceData Representation2210/12 · May/June 2023 · Q210 Marks

Binary numbers can be converted to hexadecimal.

  1. (a)Convert the two binary numbers to hexadecimal. 10010011 00001101 Working space[4]
  2. (b)(i)Complete the binary register to show its contents after this logical right shift. 0 1 1 1 1 0 1 0[1]
  3. (b)(ii)State one effect this logical shift has on the binary number.[1]
  4. (c)Give two reasons why a programmer may use hexadecimal to represent binary numbers.[2]
  5. (d)Denary numbers can also be converted to hexadecimal. Convert the denary number to hexadecimal. 301 Working space[2]

Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

  1. [1] 9
  2. [1] 3
  3. [1] 0
  4. [1] D
  5. [1] 00001111
  6. [1] The value becomes incorrect/inaccurate as the right most bits are lost
  7. [1] It is divided by 8
  8. [1] Easier/quicker to understand/read/write
  9. [1] Easier/quicker to debug
  10. [1] Less likely to make a mistake
  11. [1] Shorter representation // Takes up less screen space
  12. [1] 1
  13. [1] 2
  14. [1] D

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About this question

Topic
Data Representation, O-Level Computer Science (syllabus 2210). Structured question, 10 marks.
Source
O-Level Computer Science, May/June 2023 Paper 1 Variant 2, question 2.

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