3.2. Input and output devices
A subsection of Computer Science, 0478, through 3. Hardware
Listing 10 of 64 questions
A washing machine uses sensors and a microprocessor to control the washing cycle of clothes. A sensor is used in each of the given tasks. Identify one suitable sensor that would be used for each task. Each sensor given must be different. Task Sensor checking the water is 30 °C checking the water acidity level after detergent is added checking the weight of the clothes to make sure that the machine is not overloaded Describe how the sensor and the microprocessor are used to make sure the water remains at 30 °C.
0478_w21_qp_11
THEORY
2021
Paper 1, Variant 1
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A train station has a ticket inspector who checks each customer’s ticket before they are allowed to get on the train. The train station wants a system that will allow the tickets to be automatically checked. Identify two suitable input devices that can be used to automatically read the tickets. The train driver pushes a button to close the train door when all passengers have boarded the train. The train door will only close when there are no passengers in the doorway. The system to check there are no passengers in the doorway uses a sensor and a microprocessor. Explain how the sensor and the microprocessor are used to check whether the train door can be closed.
0478_w23_qp_12
THEORY
2023
Paper 1, Variant 2
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Nikita wishes to print out some documents and connects her printer to the computer using one of the USB ports. Identify what type of data transmission is being used. Give three reasons for using a USB port. The printer runs out of paper while it is printing the documents. A signal is sent to the processor to request that the problem is dealt with. Name this type of signal. State one suitable application for each printer below. A different application must be given for each printer. Inkjet printer 3D printer Name another type of printer and describe one way in which it is different from the printers named in part . Give an application for this printer. Type of printer Description Application
0478_s16_qp_11
THEORY
2016
Paper 1, Variant 1
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Nikita wishes to print out some documents and connects her printer to the computer using one of the USB ports. Identify what type of data transmission is being used. Give three reasons for using a USB port. The printer runs out of paper while it is printing the documents. A signal is sent to the processor to request that the problem is dealt with. Name this type of signal. State one suitable application for each printer below. A different application must be given for each printer. Inkjet printer 3D printer Name another type of printer and describe one way in which it is different from the printers named in part . Give an application for this printer. Type of printer Description Application
0478_s16_qp_13
THEORY
2016
Paper 1, Variant 3
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An underground car park has a system that checks the height of vehicles. A vehicle can be no higher than 1.8 metres to enter the car park. The system also counts the number of vehicles that have entered the car park, so that it can display how many parking spaces are still available. Each parking space has a red and a green light above it. If a car is parked in the parking space only the red light is on, otherwise only the green light is on. Sensors and a microprocessor are used to control the system. Complete the table to identify a suitable sensor for each part of the system. Task Sensor check if a vehicle is too high count the vehicles entering the car park check if a vehicle is parked in a parking space Describe how the sensor and the microprocessor are used to display the red or green light above the parking space.
0478_s21_qp_13
THEORY
2021
Paper 1, Variant 3
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Questions Discovered
64