Which of the following set contains only input devices ?

Answer: The set containing only input devices is Keyboard, Mouse, Scanner.

Reason: Input devices send data to the computer; output devices receive or display data from the computer.

• Keyboard, Mouse, Scanner — All three are input devices: keyboard for text entry, mouse for pointer/click input, scanner for converting physical documents into digital input.

• Printer, Speaker, Monitor — All are output devices: printer produces hard copies, speaker produces sound, monitor displays visuals.

• Keyboard, Mouse, Printer — Contains two input devices (keyboard, mouse) but also a printer, which is an output device, so the group is not all input devices.

• Printer, Scanner, Speaker — Contains one input device (scanner) and two output devices (printer, speaker), so the group is not all input devices.

Note: The original answer key marked the group containing a printer, speaker, and monitor as correct, but that is incorrect because those are output devices. The correct group is Keyboard, Mouse, Scanner.