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Which one of the following is 'not' input device?
1. Magnetic Ink character recognisation
2. Optical mark Recognisation (OMR)
3. Trackball
4. Speaker

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Correct Answer - Option 4 : Speaker

The correct answer is Speaker.

  • Speaker is a 'not' input device.

  • Input device 
    • An input device is a piece of computer hardware equipment used to provide data and control signals to an information processing system such as a computer or information appliance.
    • Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.
    • Speakers are one of the most common output devices used with computer systems.

  • Output Unit
    • An output device is any piece of computer hardware equipment that converts information into human-readable form.
    • It can be text, graphics, tactile, audio, and video. Some of the output devices are Visual Display Units i.e. a Monitor, Printer graphic Output devices, Plotters, Speakers, etc.

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