The OCR recognises the _______ of the characters with the help of light source.
Answer: B
Correct answer: shape
Optical Character Recognition shines light on the page and reads the pattern of light and dark to work out the shape of each character, which it then matches against the shapes it knows. Size, colour and ink are irrelevant to that matching, which is why OCR can read many typefaces.
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What type of device is a digital camera?
Answer: A
Correct answer: Input
A digital camera captures an image and passes it to the computer, so it supplies data to the machine. Storage is what the memory card inside it does; the camera's role in relation to the computer is input.
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USB refers to
Answer: C
Correct answer: a port type
USB stands for Universal Serial Bus, and in ordinary use the term names the kind of port and connector by which peripherals attach to a computer. It is neither a storage device nor a processor, though many storage devices connect through it.
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The wheel located between the two standard buttons on a mouse is used to ____
Answer: D
Correct answer: Scroll
The wheel between the two buttons rolls the view up and down a document or page. Clicking and selecting are done with the buttons on either side of it.
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Which of the following groups consists of only input devices?
Answer: D
Correct answer: Mouse, Keyboard, Scanner
All three send data into the computer. Every other group contains an output device - a monitor, a printer or a plotter - which disqualifies it.
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Which of these is a pointing device ?
Answer: A
Correct answer: Trackball
A trackball reports movement of a ball rotated by the hand and so positions the cursor, placing it with the mouse, touchpad and light pen among pointing devices. The other three are all output devices.
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Which among the device that converts computer output into a form that can be transmitted over a telephone line?
Answer: D
Correct answer: Modem
A telephone line carries an analogue signal, so computer output must be modulated onto it and demodulated at the far end - the two operations that give the modem its name. A multiplexer combines several signals on one channel but does not convert between digital and analogue.
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Which technology converts printed text on a scanned page into editable digital text ?
Answer: C
Correct answer: OCR
Optical Character Recognition analyses the shapes of printed characters and produces machine-encoded text. OMR only detects whether a mark is present, and MICR reads magnetically encoded characters such as those on a cheque.
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The most widely used input device is the ____
Answer: B
Correct answer: Keyboard
The keyboard is the input device present on virtually every computer and used for nearly all text and command entry. A mouse is almost as common but points rather than enters data; a modem is a communication device and a monitor is an output device.
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