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10. Boolean logic
A section of Computer Science, 2210
Listing 10 of 36 questions
A gas fire has a safety circuit made up of logic gates. It generates an alarm (X = 1) in response to certain conditions. Input Description Binary value Conditions G gas pressure gas pressure is correct gas pressure is too high C carbon monoxide level carbon monoxide level is correct carbon monoxide level is too high L gas leak detection no gas leak is detected gas leak is detected The output X = 1 is generated under the following conditions: gas pressure is correct AND carbon monoxide level is too high OR carbon monoxide level is correct AND gas leak is detected Draw a logic circuit for this safety system. * & ; / Complete the truth table for the safety system. G C L Workspace X Complete the truth table for the XOR gate: A B C
2210_s15_qp_12
THEORY
2015
Paper 1, Variant 2
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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. “The only time the output will be 1 is when both inputs are 1.” State the single logic gate Draw the single logic gate: “The only time the output will be 1 is when both inputs are 0.” State the single logic gate Draw the single logic gate: “The only time the output will be 0 is when both inputs are 1.” State the single logic gate Draw the single logic gate:
2210_s19_qp_11
THEORY
2019
Paper 1, Variant 1
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Questions Discovered
36