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.
Please log in or register to report this question.
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.
Please log in or register to report this question.
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.
Please log in or register to report this question.
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.
Please log in or register to report this question.
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.
Please log in or register to report this question.
