Which of the following groups consists of only output devices ?
- (a)Scanner, Printer, Monitor
- (b)Keyboard, Printer, Monitor
- (c)Mouse, Printer, Monitor
- (d)Plotter, Printer, Monitor
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.
- (a)Scanner, Printer, Monitor — A scanner is an input device — it reads a document into the computer — so this group is not all output.
- (b)Keyboard, Printer, Monitor — A keyboard is an input device (it feeds keystrokes into the computer), so this group is mixed.
- (c)Mouse, Printer, Monitor — A mouse is an input (pointing) device, so this group is not entirely output.
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.
The question is a 'find the odd one out' filter: each wrong option sneaks in exactly one input device (scanner, keyboard or mouse). Scan each group and reject it the moment you spot an input device — only (d) survives.
- Output devices: monitor, printer, plotter, speaker, projector
- Input devices: keyboard, mouse, scanner, microphone, joystick
- A plotter is an output device that draws vector/line graphics (maps, CAD)
- Options (a), (b), (c) each contain one input device (scanner / keyboard / mouse)
Only group (d) — plotter, printer, monitor — is made up entirely of output devices.
- Treating a scanner as an output device — it is an input device
- Overlooking one input device hidden in an otherwise-output group
MPPSC and PCS papers repeatedly test 'which group is only input / only output'. Memorise the two lists and eliminate any group that mixes them.
No directly related past PYQ was found.
- practice — not a real PYQ
Which one of the following is an input device?
- (a)Printer
- (b)Plotter
- (c)Scanner
- (d)Monitor
Answer(c) Scanner — it reads documents into the computer.
- practice — not a real PYQ
A plotter is best described as an output device used to:
- (a)Scan documents into the computer
- (b)Draw line graphics such as maps and engineering drawings
- (c)Enter text into the computer
- (d)Point and click on the screen
Answer(b) Draw line graphics such as maps and engineering drawings.