Input Devices. - SS1 ICT Past Questions and Answers - page 2

The main purpose of input devices is to enable users to communicate with computers by providing data, commands, or interactions. Examples of input devices include keyboards for typing text and commands, mice for navigating and selecting on-screen elements, microphones for voice input, and scanners for converting physical documents into digital files.

A mouse contributes to user interaction by allowing precise control over the on-screen cursor. It performs functions such as pointing and clicking to select objects, dragging to move files or elements, and scrolling to navigate through documents or web pages. It also provides context-sensitive options through right-clicking and can be customized for specific tasks.

A scanner would be used in an office scenario where a user needs to convert a printed document, such as a contract or a receipt, into a digital format. By doing so, the document can be easily stored, shared electronically, and backed up. This digitization reduces the need for physical storage space, makes document retrieval faster, and enables easy distribution to multiple recipients.

A joystick is more preferable than a mouse in scenarios where precise control over movement is required. For example, in flight simulation games, a joystick allows for realistic control of an aircraft's pitch, roll, and yaw. In arcade-style games like racing simulators, a joystick can provide better control over steering and acceleration compared to a mouse. Additionally, joysticks are used in robotics to control the movement of robotic arms in industrial settings due to their fine-tuned movement capabilities.