O-LevelComputer ScienceAutomated and emerging technologies2210/12 · Oct/Nov 2018 · Q105 Marks

A system uses pH sensors and a microprocessor to help monitor pollution in a river. The pH of the water should be between 6 and 8. The system outputs an alert if the pH of the water is not in this range. Explain how the system uses the pH sensors and the microprocessor to help monitor the pollution.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.

[5] Five from:
∞ The sensor sends data to the microprocessor
∞ The analogue data is converted to digital (using ADC)
∞ The microprocessor compares the reading to the set range/stored values/stored data (6 to 8) ...
∞ ... If the reading is >8 or <6 / outside range
∞ ... the microprocessor sends a signal to output the alert
∞ The process is continuous/repeated

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Topic: Automated and emerging technologies, O-Level Computer Science (syllabus 2210). Structured question, 5 marks.
Source: O-Level Computer Science, Oct/Nov 2018 Paper 1 Variant 2, question 10.

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