Which of the following is not an example of an output device in a computer system ?

Correct option is A

A scanner is not an output device; it is an input device used to capture images or text from physical documents and convert them into digital form. Output devices, on the other hand, present processed information to the user. Since speakers, printers, and plotters all deliver output, the scanner is the correct answer.
Important Key Points:
1. What is an Output Device? A device that receives data from the computer and presents it to the user in a usable form.
2. Nature of a Scanner: A scanner captures information and sends it into the computer, making it an input device.
3. Examples of Output Devices: Speaker (audio output), Printer (hard copy text/images), Plotter (large graphical output).
4. Role of Input Devices: Used to enter data or instructions into the computer system.
5. Common Input Devices: Keyboard, mouse, scanner, microphone, webcam.
6. Always identify the direction of data flow—into the computer (input) or out to the user (output).
Knowledge Booster:
· Why option (b) Speaker is incorrect? A speaker produces sound output from the computer.
· Why option (c) Printer is incorrect? A printer produces hard-copy output.
· Why option (d) Plotter is incorrect? A plotter produces graphical hard-copy output, especially large designs.