O-LevelComputer ScienceBoolean logic2210/12 · Oct/Nov 2018 · Q35 Marks
A greenhouse uses a system to monitor the conditions that plants need to grow. The inputs to the system are: Input Binary value Condition W 1 Window is open 0 Window is closed T 1 Temperature >=26 °C 0 Temperature <26 °C H 1 Humidity >=50% 0 Humidity <50% The system will sound an alarm when certain conditions are detected. Alarm (X) will sound (=1) when: window is closed and temperature >=26 °C or temperature <26 °C and humidity >=50% Draw a logic circuit to represent the system. W T H X
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [5] 1 mark for each correct logic gate, with correct inputs.
- [Diagram of logic circuit shows: NOT gate for W, AND gate for (NOT W and T), NOT gate for T, AND gate for (NOT T and H), OR gate for the two AND gate outputs leading to X.]
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