AIOU Solved Assignments Cost Accounting 444 Autumn 2022
AIOU Solved Assignments Cost Accounting 444 Autumn 2022

Describe any three input and three output devices with examples

Input Devices


  • A simple device comprising keys and each key denotes either an alphabet, number, or number commands which can be given to a computer for various actions to be performed
  • It has a modified version of typewriter keys
  • The keyboard is an essential input device and computers and laptops both use keyboards to give commands to the computer.


  • It is also known as a pointing device
  • Using mouse we can directly click on the various icons present on the system and open up various files and programs
  • A mouse comprises 3 buttons on the top and one trackball at the bottom which helps in selecting and moving the mouse around, respectively
  • In the case of laptops, the touchpad is given as a replacement for the mouse which helps in the movement of the mouse pointer.

Joy Stick

  • It is a device that comprises a stick that is attached at an angle to the base so that it can be moved and controlled
  • Mostly used to control the movement in video games
  • Apart from a computer system, a joystick is also used in the cockpit of an airplane, wheelchairs, cranes, trucks, etc. to operate them well.

Output Device


  • The device which displays all the icons, text, images, etc. over a screen is called the Monitor
  • When we ask the computer to perform an action, the result of that action is displayed on the monitor
  • Various types of monitors have also been developed over the years


  • A device that makes a copy of the pictorial or textual content, usually over paper is called a printer
  • For example, an author types the entire book on his/her computer and later gets a printout of it, which is in the form of paper and is later published
  • Multiple types of printers are also available in the market, which can serve different purposes


  • A device through which we can listen to a sound as an outcome of what we command a computer to do is called a speaker
  • Speakers are attached with a computer system and also are hardware devices that can be attached separately With the advancement in technology, speakers are now available which are wireless and can be connected using Bluetooth or other applications.

Describe any three input and three output devices with examples

Explain the purpose of the speech recognition device

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