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10. Boolean logic
A section of Computer Science, 0478
Listing 10 of 62 questions
A system controls the flow of vehicles through a barrier based on three lights, A, B and C. When a light is red, the signal is zero. When a light is green, the signal is one. The barrier will open when the output X is one. The barrier opens if either: • light A is red and lights B and C are both green or • light A is green and lights B and C are both red Design a logic circuit for the system. A B C X Complete the truth table for the system given at the start of Question 14. A B C Working space X
0478_m17_qp_12
THEORY
2017
Paper 1, Variant 2
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Complete the truth table for the given logic circuit. Do not attempt to simplify the logic circuit. A B X C A B C Working space X A water control system uses a switch and two pressure sensors. The outputs of the switch and sensors are shown in the table. Sensor or Switch Output of 1 Output of 0 Switch (S1) On Off Pressure Sensor (P1) >= 3 = 3 < 3 Create a logic circuit that will produce an output (of 1 when: The switch S1 is on and either P1 is less than 3 or P2 is less than 3, but not both. All logic gates used must have a maximum of two inputs. S1 P1 P2 X
0478_m20_qp_12
THEORY
2020
Paper 1, Variant 2
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Questions Discovered
62