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Which among the following devices is not an input device in computer system?
1. Keyboard
2. Scanner
3. Mouse
4. Printer

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Correct Answer - Option 4 : Printer

Four major functions of a computer are Input, Process, Output, Storage. A computer consists of the following main components

  1. Input Unit
  2. Output Unit
  3. Central Processing Unit
  4. Memory Unit

Input Devices:
Input devices are the component of the computer system that accepts incoming data and instructions and converts them into a pattern of electrical signals in binary code that is understandable to a digital computer.

Output Devices:
Output devices are the component of a computer system that converts the digitized signals into a form understandable to the user. The output devices are generally known as the reverse of input devices. Output devices also send data from one computer system to another.

The basic difference between Input and Output devices:

INPUT DEVICE

OUTPUT DEVICE

It accepts data from the user.

It reflects processed data to the user.

It is directly commanded by the user.

It is commanded by the processor.

It converts user-friendly instruction into a machine friendly.

It converts the machine’s instructions to user intelligible.

It takes the data from the user and sends it to the processor for execution.

It takes the processed data from the processor and sends it back to the user.

It helps the computer is accepting the data.

It helps the computer is displaying the data.

The design of input devices is more complex.

The design of output devices is less complex.

Ex: Keyboard, Image Scanner, Microphone, Pointing device, Graphics tablet, Joystick, Mouse

Ex: Monitor, Printers, Plotters, Projector, Speakers.

 

Therefore, Printers, is not an input device.

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