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O-LevelComputer ScienceData Representation2210/12 · May/June 2018 · Q36 Marks

A stopwatch uses six digits to display hours, minutes and seconds. The stopwatch is stopped at: 02 : 31 : 58 Hours Minutes Seconds An 8-bit register is used to store each pair of digits.

  1. (a)Write the 8-bit binary numbers that are currently stored for the Hours, Minutes and Seconds. Hours Minutes Seconds[3]
  2. (b)The stopwatch is started again and then stopped. When the watch is stopped, the 8-bit binary registers show: Hours 0 0 0 0 0 1 0 1 Minutes 0 0 0 1 1 0 1 0 Seconds 0 0 1 1 0 1 1 1 Write the denary values that will now be shown on the stopwatch. Hours Minutes Seconds[3]

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Mark scheme

Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.

  1. [1] (a) Hours: 00000010
  2. [1] (a) Minutes: 00011111
  3. [1] (a) Seconds: 00111010
  4. [1] (b) Hours: 05
  5. [1] (b) Minutes: 26
  6. [1] (b) Seconds: 55

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About this question

Topic
Data Representation, O-Level Computer Science (syllabus 2210). Structured question, 6 marks.
Source
O-Level Computer Science, May/June 2018 Paper 1 Variant 2, question 3.

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