O-LevelComputer ScienceBoolean logic2210/22 · Oct/Nov 2023 · Q98 Marks
Consider the logic expression: Z = (A NAND B) OR NOT (B XOR C)
- (a)Draw a logic circuit for this logic expression. Each logic gate must have a maximum of two inputs. Do not simplify this logic expression. A B C Z[4]
- (b)Complete the truth table from the given logic expression. 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 Working space Z[4]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.
- [4] One mark for each correct gate, with the correct input(s) as shown.
- [4] Four marks for eight correct outputs.
- Three marks for six or seven correct outputs.
- Two marks for four or five correct outputs.
- One mark for two or three correct outputs
- A B C Z
- 0 0 0 1
- 0 0 1 1
- 0 1 0 1
- 0 1 1 1
- 1 0 0 1
- 1 0 1 1
- 1 1 0 0
- 1 1 1 1
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