O-LevelComputer ScienceBoolean logic2210/12 · May/June 2017 · Q108 Marks
For this logic statement: X = 1 if ((A is 1 AND B is 1) OR ( B is 1 AND C is NOT 1))
- (a)Draw the logic circuit.[4]
- (b)Complete the truth table for the given logic statement. A B C 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1[4]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- 10(a) 1 mark for each correct gate, with the correct input(s)
- 10(b) Truth table: A B C X 0 0 0 0 0 0 1 0 0 1 0 1 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 1 1 1 1 1 4 marks for 8 correct outputs 3 marks for 6 or 7 correct outputs 2 marks for 4 or 5 correct outputs 1 mark for 2 or 3 correct outputs
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