Which of the following isn't used to navigate in a computer?

Navigating a computer means moving around the screen, selecting items, and controlling the position of the pointer or text-entry point. The cursor is the on-screen marker that shows the current position; the keyboard moves the cursor with arrow keys and shortcuts; the mouse moves the pointer, clicks, and drags. All three are directly involved in moving around and interacting with what is on the screen.

A scanner is an input device used to capture an image of a physical document or photograph and convert it into digital form. It plays no role in moving the pointer or the cursor around the screen, so it is not a navigation tool.

Exam takeaway: group devices by function before answering this style of question. Navigation devices control on-screen position (mouse, keyboard, cursor, trackball, joystick); scanners belong to the separate category of devices that digitise existing physical material.