3.2. Input and output devices
A subsection of Computer Science, 2210, through 3. Hardware
Listing 10 of 39 questions
Name an application which makes use of the following sensors. A different application should be used in each case. Temperature Magnetic field Motion The flowchart on the opposite page shows how a light sensor and microprocessor are used to switch a street lamp on or off. When the sensor reading is <= 50 light units, the lamp is turned on automatically. Several of the instructions have been omitted from the flowchart. Using item numbers only from the list below, complete the flowchart: Item number Instruction Count down in minutes Is light reading <= 50? Is street lamp already on? Is time = 0? The microprocessor compares the sensor reading with stored values The sensor reading is sent to the microprocessor Switch the street lamp off Switch street lamp on Time set to 10 minutes
2210_w15_qp_13
THEORY
2015
Paper 1, Variant 3
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A washing machine has a small display screen built into it. One use of the display screen is to show an error code when a problem has occurred with a washing cycle. State whether the display screen is an input, output or storage device. The display screen shows a hexadecimal error code: E04 This error code means that the water will not empty out of the washing machine. Convert this error code to binary. State why hexadecimal is used to display the error code. Identify three sensors that could be used in the washing machine. State what each sensor could be used for. Sensor 1 Use Sensor 2 Use Sensor 3 Use
2210_w17_qp_13
THEORY
2017
Paper 1, Variant 3
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An automated water tap system uses a sensor and a microprocessor to operate. Water flows from the tap when a person’s hands are placed underneath the tap. Water stops flowing when the person’s hands are removed from underneath the tap. Explain how the water tap system uses a sensor and a microprocessor to operate. Three descriptions are shown of different systems. Identify the most suitable sensor that could be used in each system. Description of system Sensor it checks the air is dry enough in a garage that spray paints cars it automatically switches on the headlights on a car when it is dark it checks that the soil in a greenhouse has the correct level of acidity
2210_w22_qp_12
THEORY
2022
Paper 1, Variant 2
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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.
2210_w23_qp_12
THEORY
2023
Paper 1, Variant 2
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Touch screen technologies can be described as resistive or capacitive. Six statements are given about resistive and capacitive technology. Tick (✓) to show if the statement applies to Resistive or Capacitive technology. Statement Resistive (✓) Capacitive (✓) This touch screen has multi-touch capabilities This touch screen cannot be used whilst wearing gloves This touch screen is made up of two layers with a small space in between This touch screen uses the electrical properties of the human body This touch screen is normally cheaper to manufacture This touch screen has a quicker response time
2210_w19_qp_12
THEORY
2019
Paper 1, Variant 2
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Questions Discovered
39