Input /Output Devices Questions and Answers

Answer: B

The device that is not an input device is the printer.

A printer is an output device: it takes data from the computer and produces a printed copy (hard copy).

A scanner converts documents and pictures into digital form, a microphone captures sound, and a mouse sends pointing and clicking movements, so all three send data into the computer and are input devices.

Answer: A

The device that does not belong is the touch screen.

In the classification of graphic input devices, a locator device feeds coordinate positions to the computer by moving a pointer or cursor: the touch pad, the digitising (graphics) tablet and the joystick all work this way, steering a position that the program then reads.

A touch screen is treated separately in this grouping, because the user selects an item by touching it directly on the display rather than by steering a locator across the screen. That is why the key singles it out while the other three are counted as locators.

Answer: A

The answer is Both (A) and (R) are true, and (R) is the correct explanation of (A).

The output unit, through devices such as monitors and printers, supplies the results of processing to the user. It can do so only because it converts the computer's internal binary-coded results into a form people can read, such as text, images or sound.

That conversion is exactly how the output unit supplies results to the outside world, so the Reason explains the Assertion, which rules out the option saying it does not.

Answer: D

The one that is not a printer is the scanner.

A scanner is an input device: it reads a document or image and converts it into digital form for the computer. A printer is an output device that does the reverse, putting data from the computer on paper.

Inkjet printers spray tiny droplets of ink, laser printers use a laser and toner powder, and dot matrix printers strike an inked ribbon with a grid of pins. All three are types of printer.

Answer: B

The best alternative is Google voice search.

A person who cannot use a keyboard comfortably needs a way to enter the search without typing. Voice search lets them speak the query, so it removes the keyboard from the task entirely.

A mouse can click links but cannot type a query on its own. An on-screen keyboard still means selecting each letter, which is slow for someone with a motor disability. Text-to-speech tools work the other way round: they read text aloud to the user, which helps a person with a visual impairment but does nothing for input.

Answer: C

The wrong match is Projector, Sound card, MICR.

MICR (Magnetic Ink Character Recognition) is an input device. Banks use it to read the magnetic-ink numbers printed along the bottom of cheques, so it does not belong in a list of output devices.

The other three sets contain only output devices, or the cards that drive them: a projector shows the screen image, speakers produce sound, and the sound card and video card convert the computer's data into audio and video output.

Answer: D

The answer is (A) is false, but (R) is true.

The assertion says printers can produce output only in black and white. That is false: colour printing has been common for decades.

The reason is true. Inkjet printers mix cyan, magenta, yellow and black inks, and colour laser printers use toner in the same four colours, so both produce coloured output.

Since the assertion is false, every option that calls both statements true, or the assertion true, is ruled out.

Answer: B

The most appropriate device is a projector.

A projector takes the video signal from the computer and throws an enlarged image of the slides onto a screen or wall, so the whole classroom can see it at once.

A printer produces paper copies, which would need one per student and cannot show a slide presentation. A speaker is an audio output device and shows nothing. A 3D printer builds solid objects layer by layer, which has nothing to do with displaying slides.

Answer: D

Correct answer: Keyboard

Text and numbers are typed, and the keyboard is the device for typing. A scanner captures an image of a page rather than its characters, and printers and plotters are output devices.

Answer: B

Correct answer: Non-impact printer

Non-impact printers - laser and inkjet - form characters without striking the paper, so they are quieter and produce far finer detail than impact printers, which press an inked ribbon against the page through a matrix of pins.