23-12-2017, 10:17 AM
MOUSE
* Pointing device used in computer
Ans : Mouse
*Mouse was invented by
Ans : Douglas Engelbert
*Unit which is used to represent the speed of a mouse
Ans : Mickey
*Most commonly, working of wireless mouse is based on
Ans : Infrared Rays
*The company that developed mouse
Ans : Xerox PARC
*The first mouse was marketed by
Ans : Apple
*The blinking symbol which indicates the next position of the character is called
Ans : Cursor
*The device used for moving the cursor on the screen of a computer
Ans : Mouse
*A small figure which depicts some applications on the screen is called
Ans : Icon
OMR
*The system used for the evaluation of competitive examinations
Ans : OMR (Optical Mark Reader)
*An optical input device that interprets pencil marks on paper media is Optical Mark Reader (OMR)
BARCODE
*A barcode is simply a numeric code represented as a series of lines.
*These lines can be read by a barcode reader/ scanner.
*Barcode Reader is an input device for reading printed bar codes. It converts optical impulses to electrical impulses.
*When the laser beam falls on it barcode reader measures the amount of light it reflected back.
*The dark bars on a barcode reflect less light than the white spaces between them.
MONITOR
* User gets the result of processed data through output devices.
Pixel and Resolution
*Resolution of monitor is associated with the number of pixels on monitor
*The smallest controllable element of a picture represented on the screen is known as
Ans : Pixel
*Pixel is the short form for
Ans : Picture element
*Capability of a sensor to observe the smallest object clearly is called as
Ans : Resolution
*Resolution depends upon the size of the pixel
*Images with smaller pixel will have a higher resolution
*Pictures with higher resolution occupy more memory space on the disc
