Input and output devices：练习题

Which of the following input devices uses a laser to scan a series of vertical black and white lines to identify a product?

A user is interacting with a tablet computer. The screen works by detecting the change in capacitance when a finger touches the glass, as the human body is an electrical conductor.

Which touch screen technology is being described?

An automated irrigation system is designed to water plants only when the soil is dry. The system includes a moisture sensor, an analogue-to-digital converter (ADC), a microprocessor, and a water valve (actuator).
Which of the following describes the most accurate sequence of events and data flow in this automated process?

Which of the following output devices uses an actuator to function correctly?

Which of the following correctly describes the operation of a 3D printer when creating an object?

State two optical advantages of using a Laser printer instead of an Inkjet printer in a high-volume office environment.

Explain why a capacitive touchscreen is often preferred over a resistive touchscreen for modern smartphones.

Identify the input device used to convert physical two-dimensional paper documents into digital image files for editing or archiving.

a) Identify one input device and one output device.

b) For each identified device, state its primary purpose in a computer system.

A smart home system is designed to monitor and control the temperature in a room. It uses a sensor to detect the current room temperature and an actuator to adjust it.

a) Identify the type of sensor most suitable for detecting room temperature and describe the data it captures.

b) Describe how this sensor, in conjunction with a microprocessor, would automatically control a heating system to maintain a desired temperature of $$22^\circ C$$. Your answer should include the role of an appropriate output device.