A-LevelComputer ScienceHardware9618/12 · Oct/Nov 2024 · Q94 Marks
A road bridge has a weight limit and a height limit for vehicles. For example, a vehicle must weigh less than 10000 kg and must have a height of less than 3m. The bridge has a warning system. If a vehicle is approaching the bridge and it exceeds one or both limits, a sign displays a warning telling the driver of the vehicle to stop.
- (a)The bridge warning system uses sensors to detect if a vehicle exceeds the limits. Complete the table by identifying two different sensors that could be used by the system and describe how each sensor is used by the system. Sensor Use in bridge warning system[2]
- (b)Explain whether the bridge warning system is an example of a monitoring system or of a control system.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2024). The mark or mark type is shown in brackets.
- [2] 1 mark for sensor and its use in this system • Infra-red sensor • Measure / check the height of the vehicle • Pressure sensor • Measure / check the weight of the vehicle
- [2] 1 mark for each bullet point (max 2) for a correct justification No marks for the identification of the system Monitoring system • Because there is no use of feedback // the warning sign is only an indicator • the output of the turning on of the sign does not affect the input of data from the sensors • The system does not have any actuators
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →