Computer Science · May / June 2016 · Paper 11 · Question 3
2210
As printed in the paper
Show the answer and mark scheme
3(a)[4]
4/5 matches – 4 marks 3 matches – 3 marks 2 matches – 2 marks 1 match – 1 mark [4]
3(b)[4]
Any four from:
– sensor(s) sends signal/data to microprocessor – signal/data converted to digital (using an ADC) – microprocessor compares signal/data with pre-set/stored value – if sensor(s) signal/data indicates the presence of a person / the door needs to be opened / a match is found / door is closed … – … microprocessor sends a signal to an actuator … – … to operate/drive a motor to open the door [4]
Monitoring the pollution levels in a river Control the switching off and on of street lighting Detection of intruders breaking into a building Monitor the amount of water left in clothes in a drier Monitor acidity levels in the soil in a greenhouse Light sensor Moisture sensor Gas sensor pH sensor Pressure sensor
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