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Do you know?
In laptop, notebook and tabs, keyboard is referred as ‘keypad’. Christopher Latham Sholes is the
inventor of keyboard.
Mouse
Mouse is a handheld pointing device that is used on a at surface and is represented
by a pointer on the screen. The pointer on the screen moves when the mouse is
moved by the user. A mouse generally consists of two buttons and a scroll wheel
on its top.
By clicking the buttons of a mouse, the user gives instructions to the computer.
The mouse was invented by Douglas Engelbart.
Joystick
Joystick is a pointing device whose function is similar to a mouse, except that a mouse
pointer stops moving on the screen as soon as the user stops moving it, while the joystick
pointer continues to move in the direction towards which the joystick has been pointed.
To stop the pointer, the user has to bring the joystick to its upright position. It is generally
used to play video games.
Scanner
A scanner is a device that scans a document by sensing the re ection
that is received when the scanner emits rays on the contents. It takes
the image of contents and converts it into a digital file.
The scanned image or photo can be stored in a computer and
easily transferred to a secondary storage device. Scanners can be
categorized as Handheld scanners and Flatbed scanners.
Optical Mark Reader (OMR)
OMR is an input device that can detect the marks on a paper. It is used to evaluate answer sheets in which
selected answers are marked in dark circles. It is used to read the given or marked answers by sensing the
marks made on the answer sheet.
Magnetic Ink Character Reader (MICR)
MICR is a device that is used by banks to process cheques by interpreting information
stored in MICR code.
On the cheques, the name of the bank, branch code and cheque number are printed
with a special kind of ink containing magnetic particles or iron oxide which is scanned
& read with the help of MICR and accordingly processed by the computer. A MICR
code consists of nine digits that identify the bank and branch.
Information & Communication Technology 57

