O-LevelComputer ScienceBoolean logic2210/11 · May/June 2019 · Q26 Marks
Rajesh creates a logic circuit. He uses three different logic gates in his circuit. Each logic gate has a maximum of two inputs. He describes the logic of each gate.
- (a)"The only time the output will be 1 is when both inputs are 1." State the single logic gate Draw the single logic gate:[2]
- (b)"The only time the output will be 1 is when both inputs are 0." State the single logic gate Draw the single logic gate:[2]
- (c)"The only time the output will be 0 is when both inputs are 1." State the single logic gate Draw the single logic gate:[2]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [1] AND
- [1] Correct AND gate symbol (D-shaped block with two inputs on left and one output on right)
- [1] NOR
- [1] Correct NOR gate symbol (AND gate symbol with an inversion circle at the output)
- [1] NAND
- [1] Correct NAND gate symbol (OR gate symbol with an inversion circle at the output)
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