Functions of Light Pen, Flatbed Plotter, Drum Printer, Joystick, OMR,, Web Camera, Optical Disk, Magnetic Disk, MICR, DVD.

Q18. Out of the following devices, write whether they are input devices, output devices or storage devices. Also write their function.

  1. Light Pen
  2. Flatbed Plotter
  3. Drum Printer
  4. Joystick
  5. OMR
  6. Web Camera
  7. Optical Disk
  8. Magnetic Disk
  9.  MICR
  10.  DVD.


  1. Light Pen: Light is an input device. Light Pen is used to identify a specific location on the screen. Light pen provides no information when held over a blank part of the screen because it is a passive device with sensor. It is also used to draw images on the screen.
  2.  Flatbed Plotter: Flatbed Plotter is output device.It is used to trace the desired graph.
  3. Drum Printer: Drum Printer is output device. A line printer that uses a rotating drum with raised characters, against which the paper is pressed is a drum printer. Two very different types of drum printers represent landmarks in the process of building ever-more-sophisticated and advanced printers as digital technologies have evolved.
  4. Joystick: Joystick is input device.The joystick is a device that lets the user move object on the screen. Children can play with computers in a simple way by the use of a joystick.
  5. OMR: OMR is input device. OMR stand for Optical Mark Reader. OMR is a special preprinted forms are designed with boxes. Each box is annotated is distinctly so that the user clearly understands what response she is marking. Such a document is red by a document reader, called Optical Mark Reader (OMR) which transcribes the marks into electrical pulses which are transmitted to the computer.
  6. Web Camera(webcam): Web Camera(webcam) is input device. A web Camera or webcam, is the loosely used term for any camera that generates images that can be accessed by and displayed on web browsers through a server.
  7. Optical Disk: Optical Disk is a storage device. An optical disc is an electronic data storage medium that can be written to and read using a low-powered laser beam.
  8. Magnetic Disk: A magnetic disk is a storage device that uses a magnetization process to write, rewrite and access data. It is covered with a magnetic coating and stores data in the form of tracks, spots and sectors.
  9. MICR: MICR is a input device. MICR stands for Magnetic Ink Character Reader. In this method, human readable characters are printed on documents (such as cheques) using a special, magnetic ink.
  10. DVD: DVD (an abbreviation of “digital versatile disc” or “digital video disc“) is digital optical disc storage that looks the same as a compact disc but is able to hold about 15 times as much information and transfer it to the computer about 20 times as fast as a CD-ROM.

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