6 . Which of the following device has a relative origin ? A. Mouse B. Joystick C. Track ball D. none of the above
Answer - A , Explanation -A computer mouse (plural mice, sometimes mouses) is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows a smooth control of the graphical user interface of a computer.
