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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