O-LevelComputer ScienceBoolean logic2210/22 · Oct/Nov 2024 · Q88 Marks
Consider the logic expression: X = (NOT P OR Q) NAND (Q XOR R)
- (a)Draw a logic circuit for this logic expression. Each logic gate must have a maximum of two inputs. Do not simplify the logic expression. P Q R [Empty space for drawing] X[4]
- (b)Complete the truth table for the given logic expression. P | Q | R | Working space | X --|---|---|---|--- 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 (Oct/Nov 2024). The mark or mark type is shown in brackets.
- [1] One mark for each correct gate, with the correct input(s) as shown.
- [4] Four marks for eight correct outputs
- [3] Three marks for six or seven correct outputs
- [2] Two marks for four or five correct outputs
- [1] One mark for two or three correct outputs
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