Which of the following groups consists of only output devices ?

Question

UnlockIAS · Accepted Answer

Correct — D, Plotter, Printer, Monitor. All three are output devices — they take data from the computer and present it to the user. A plotter draws line graphics (used for maps, CAD and engineering drawings), a printer produces text and images on paper, and a monitor displays output on screen. The other three groups each contain an input device, so only group (d) is entirely output.

Why the other options are wrong — (a) A scanner is an input device — it reads a document into the computer — so this group is not all output.  (b) A keyboard is an input device (it feeds keystrokes into the computer), so this group is mixed.  (c) A mouse is an input (pointing) device, so this group is not entirely output.

Concept: Peripherals are classified by the direction of data flow. Input devices send data INTO the computer (keyboard, mouse, scanner, microphone, joystick). Output devices present processed data OUT to the user (monitor, printer, plotter, speaker, projector). A plotter is a specialised output device that draws precise line drawings.

State PCS 2019 Q74 — Science & Technology PYQ with Answer

State PCS 2019 Q74 — Science & Technology PYQ with Answer