Which of these is an output device ?
Answer: C
Correct answer: Speaker
A speaker converts data held in the computer into sound the user can hear, so it carries information outward. Joysticks, barcode readers and webcams all capture information and send it into the machine.
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OMR, used to evaluate multiple-choice answer sheets, stands for ________.
Answer: A
Correct answer: Optical Mark Reader
An Optical Mark Reader detects the presence or absence of a pencil mark in a defined position, which is why answer sheets ask for a bubble to be filled completely. It differs from OCR, which recognises the shapes of characters themselves.
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MICR character set consists of only 2 digits 0 and 1.
Answer: B
Correct answer: False
The E-13B character set used for MICR has fourteen characters: the ten digits 0 to 9 and four special symbols marking the transit, amount, on-us and dash fields on a cheque.
Restricting it to two would make it useless for printing account and cheque numbers, which is its whole purpose. The characters have a deliberately distinctive shape, with thick and thin strokes, so that each produces a waveform the read head can distinguish unambiguously.
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Which of these is both an input and an output device ?
Answer: A
Correct answer: Touch screen
A touch screen displays output and accepts input through the same surface, which is why it counts as both. A scanner and a light pen take input only, and a plotter produces output only.
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A light pen is classified as which type of device ?
Answer: A
Correct answer: Input device
A light pen senses the position on a screen where it is held and reports it to the computer, so information travels inward. It is a pointing device, in the same family as the mouse, trackball and stylus.
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_________ is used to captures images in a digitized form that a computer can use.
Answer: C
Correct answer: Digital Camera
A digital camera focuses an image onto a sensor - a CCD or CMOS array - which converts light into electrical charge and then into digital values, so the image arrives already in a form the computer can process.
A film camera captures an image too, but on chemical emulsion, which must be developed and scanned before a computer can use it. A memory card stores what the camera produces, and an indicator LED on the case captures nothing.
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A __________ is a digital video camera that captures real-time video for transmission to others via a Web Server.
Answer: C
Correct answer: Webcams
A webcam is a digital video camera that produces a continuous stream rather than single frames, and the stream is sent over a network as it is captured - which is what "real-time" means here.
The distinction from a digital camera is the continuity and the immediacy: a still camera stores what it captures for later transfer. It is an input device, converting a physical scene into data, and a storage chip merely holds what some other device produced.
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