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1.3. Hardware
A subsection of Computer Science, 9608, through 1. Theory Fundamentals
Listing 10 of 37 questions
The following is a logic expression. X = NOT(A OR B) OR (A AND (B XOR C)) Draw the logic circuit for the given expression, using a maximum of four logic gates. X B A C Complete the truth table for the logic expression: X = NOT(A OR B) OR (A AND (B XOR C)) A B C Working space X The following is a logic expression. A AND B XOR C OR NOT A Identify one logic gate that would not be used in the logic circuit for this expression. Draw the symbol for the logic gate. Logic gate Logic gate symbol:
9608_s20_qp_13
THEORY
2020
Paper 1, Variant 3
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Three digital sensors A, B and C are used to monitor a process. The outputs from the sensors are used as the inputs to a logic circuit. A signal, X, is output from the logic circuit: logic circuit A B output X C Output, X, has a value of 1 if either of the following two conditions occur: • sensor A outputs the value 1 OR sensor B outputs the value 0 • sensor B outputs the value 1 AND sensor C outputs the value 0 Draw a logic circuit to represent these conditions. A B C X Complete the truth table for the logic circuit described in part . A B C Working Space X Write a logic statement that describes the following logic circuit. A B C X
9608_s15_qp_13
THEORY
2015
Paper 1, Variant 3
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An alarm system (is enabled and disabled using either a switch (A) or a remote control (B). There are two infra-red sensors (C, D) and one door pressure sensor (E). Parameter Description of parameter Binary value Condition A Switch Switch enabled Switch disabled B Remote control Remote enabled Remote disabled C Infra-red sensor Activated Not activated D Infra-red sensor Activated Not activated E Door pressure sensor Activated Not activated The alarm sounds (X = 1) if the alarm is enabled and any one or more of the sensors is activated. Draw a logic circuit to represent the alarm system. A B C X D E Complete the truth table for the logic expression: X = A OR (B XOR C) A B C Working space X
9608_s18_qp_11
THEORY
2018
Paper 1, Variant 1
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A greenhouse control system has four input parameters (H, D, T, W) and two outputs (X, Y). Parameter Description of parameter Binary value Condition H Humidity Too low Acceptable D Day Night Day T Temperature Too high Acceptable W Windows Closed Open The watering system turns on (X = 1) if: either it is daytime and the temperature is too high or the humidity is too low. The fan turns on (Y = 1) if the temperature is too high and the windows are closed. Draw a logic circuit to represent the greenhouse control system. H X Y D T W Complete the truth table for the logic expression: X = NOT A AND (B NAND C) A B C Working space X
9608_s18_qp_12
THEORY
2018
Paper 1, Variant 2
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Questions Discovered
37