TestOut LabSim A+ Certification Practice Exam

Which of the following are considered input devices? (Select two)

1. Keyboard; Monitor

2. Trackball; Touchscreen

3. Printer; Mouse

4. Scanner; Projector

The correct answer is: Trackball; Touchscreen

Input devices are hardware components that allow users to provide data and control signals to a computer system. In the context of the provided choices, the trackball and touchscreen fall under this category because both are designed to receive input from the user. A trackball is a pointing device consisting of a ball housed in a socket that detects rotation along two axes, which allows users to move the cursor on the screen. This input mechanism is crucial for navigation and user interaction with digital interfaces. A touchscreen, on the other hand, enables direct interaction with what is displayed on the screen. Users can tap, swipe, or use various gestures to control applications and navigate through the device, providing a tactile and intuitive way to interact with technology. In contrast, the other options contain devices that either do not input data into the computer or are primarily output devices. For example, a monitor and projector serve to display information rather than collect it, while printers also produce physical outputs rather than interact through user input. Therefore, the combination of trackball and touchscreen correctly identifies two input devices.