Which one of the following groups have only input devices?

The correct answer is Option 4

Key Points

• Mouse, Keyboard, Scanner
  • ​An input device is any hardware component that allows a user to enter data and control signals into a computer system. 
  • Mouse – Used for pointing and selecting (Input device )
  • Keyboard – Used for typing and entering commands (Input device)
  • Scanner – Used for digitizing documents and images (Input device)

• Why the other options are incorrect?

• Option 1 (Mouse, Keyboard, Projector) 
  • A projector is an output device as it displays visual output from the computer.
• Option 2 (Mouse, Keyboard, Monitor) 
  • A monitor is an output device as it displays graphical and textual content.
• Option 3 (Mouse, Keyboard, Printer) 
  • A printer is an output device as it produces hard copies of digital documents.

• Hence, Option 4: Mouse, Keyboard, Scanner (All are input devices)