O-LevelComputer ScienceBoolean logic2210/12 · Oct/Nov 2022 · Q76 Marks
NAND, OR and XOR are three types of logic gate.
- (a)Four statements are shown about the logic gates. Tick (✔) to show which statements apply to each logic gate. Some statements may apply to more than one logic gate. Statement | NAND (✔) | OR (✔) | XOR (✔) ---|---|---|--- if both inputs are 1, the output is 1 | | | if both inputs are different from each other, the output is 1 | | | if both inputs are 0, the output is 0 | | | if both inputs are the same as each other, the output is always 0 | | |[4]
- (b)NAND, OR, XOR, NOR and NOT are all examples of logic gates. State the name of one other logic gate and complete its truth table. Logic gate Truth table: A | B | Output ---|---|--- 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 |[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.
- [4] 7(a) One mark for each correct row Statement | NAND (√) | OR (✔) | XOR (√) ---|---|---|--- if both inputs are 1, the output is 1 | | ✓ | if both inputs are different from each other, the output is 1 | | ✓ | ✓ if both inputs are 0, the output is 0 | ✓ | | if both inputs are the same as each other, the output is always 0 | | | ✓
- [2] 7(b) One mark for a correct logic gate, one mark for a corresponding truth table • AND A | B | Output ---|---|--- 0 | 0 | 0 0 | 1 | 0 1 | 0 | 0 1 | 1 | 1
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