Which of the following is not an input device?
- A.Joystick
- B.Light pen
- C.Plotter
- D.Barcode reader
Correct answer
Explanation
The correct answer is C, plotter. A plotter takes a drawing that the computer has already prepared and puts it on paper with a moving pen, so data travels out of the machine and never into it. That makes it an output device, and the pen misleads many candidates into marking it as an input.
Option A, the joystick, sends the position of its lever to the computer and is therefore an input device used in games, simulators and machine control. Option B, the light pen, is a photo-sensitive pointing device that tells the computer which point of the screen it is touching, again an input. Option D, the barcode reader, shines light on the printed bars, measures the reflection and sends the decoded number in, which is how billing counters and libraries use it. The safe test is simply the direction in which the data moves.
Read the full article: Input and Output Devices: Types, Examples and MCQs
Practice Questions
View allWhich of the following is both an input and an output device?
- A.Scanner
- B.Plotter
- C.Touchscreen
- D.Light pen
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A touchscreen accepts a finger tap or a stylus stroke as input and displays the result on the very same surface, so the one piece of hardware performs both jobs.
Read the full explanation →Who invented the computer mouse?
- A.Douglas Engelbart
- B.Charles Babbage
- C.Jack Kilby
- D.Christopher Latham Sholes
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He built the first mouse, a small wooden box with a pair of wheels underneath, at the Stanford Research Institute, and the patent describes it as an X-Y position indicator for a display system.
Read the full explanation →Which of the following is an impact printer?
- A.Laser printer
- B.Inkjet printer
- C.Dot matrix printer
- D.Thermal printer
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Its print head carries a column of tiny pins that strike an inked ribbon against the paper, forming each character out of dots.
Read the full explanation →MICR technology is used mainly in which of the following?
- A.Processing of bank cheques
- B.Reading objective answer sheets
- C.Billing at a retail counter
- D.Recording fingerprints
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MICR stands for Magnetic Ink Character Recognition. The line of characters printed along the foot of a cheque is set in magnetic ink in the E-13B font, and the reader identifies each character from its magnetic signal, so the cheque is sorted correctly even when it has been folded, stamped…
Read the full explanation →The smallest element of a picture displayed on a computer screen is called a
- A.Bit
- B.Pixel
- C.Byte
- D.Dot pitch
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The word is a contraction of picture element. A screen image is a grid of these points, and the number of them across and down the screen is what is quoted as the resolution of the monitor, so a higher pixel count means a finer picture.
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