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Q: Trackball is which of the following devices?
  • A. Touchpad
  • B. Output device
  • C. Input device
  • D. Barcode reader
Correct Answer: Option C - A trackball is an input device used to enter motion data into computers or other electronic devices. It serves the same purpose as a mouse, but it is designed with a moveable ball on the top, which can be rolled in any direction.
C. A trackball is an input device used to enter motion data into computers or other electronic devices. It serves the same purpose as a mouse, but it is designed with a moveable ball on the top, which can be rolled in any direction.

Explanations:

A trackball is an input device used to enter motion data into computers or other electronic devices. It serves the same purpose as a mouse, but it is designed with a moveable ball on the top, which can be rolled in any direction.