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O-LevelComputer ScienceBoolean logic2210/23 · Oct/Nov 2024 · Q84 Marks

A logic circuit is to be built to control the automatic opening of a window. The window W opens if the temperature T is too high, the heater H is off, and the air conditioning A is off. air conditioning off 0 air conditioning A air conditioning on 1 not too high 0 temperature T too high 1 heater off 0 heater H heater on 1 window closed 0 window W window open 1 Complete the truth table for this problem. A T H W 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1

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Mark scheme

Marking points from the official mark scheme (Oct/Nov 2024). The mark or mark type is shown in brackets.

  1. 4 marks for 8 correct outputs
  2. 3 marks for 6/7 correct outputs
  3. 2 marks for 4/5 correct outputs
  4. 1 mark for 2/3 correct outputs
  5. A T H W
  6. 0 0 0 0
  7. 0 0 1 0
  8. 0 1 0 1
  9. 0 1 1 0
  10. 1 0 0 0
  11. 1 0 1 0
  12. 1 1 0 0
  13. 1 1 1 0

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About this question

Topic
Boolean logic, O-Level Computer Science (syllabus 2210). Structured question, 4 marks.
Source
O-Level Computer Science, Oct/Nov 2024 Paper 2 Variant 3, question 8.

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