Q.Which one of the following is an input device? (A) Monitor
(B) Printer
(C) Scanner
(D) Speaker

An input device is one that carries data INTO the computer; three of the options only send results out to the user.

An input device takes data and instructions into the computer, while an output device presents processed results to the user.

(A) A monitor displays output on screen — it is an output device — incorrect.

(B) A printer produces output on paper — it is an output device — incorrect.

(C) A scanner converts a printed document or photo into a digital image entered into the computer — it is an input device — correct.

(D) A speaker produces sound output — it is an output device — incorrect.

Students sometimes group all peripheral devices together — the test is the direction of data flow: input devices bring data in, output devices send results out. A touch screen is an exception, acting as both.