The full form of MODEM is
- A.Modular Demonstrator
- B.Modulator-Demodulator
- C.Monitor Demodulator
- D.Mode Demarcator
Correct answer
Explanation
The correct answer is B, Modulator-Demodulator. The device does two opposite jobs, and the name simply joins them. While sending, it modulates: it converts the digital signal of the computer into an analogue signal that an ordinary line can carry. While receiving, it demodulates: it converts the incoming analogue signal back into digital form that the computer understands.
Because data moves through it in both directions, the modem is one of the standard answers to the question about devices that are both input and output. Options A, C and D are invented expansions of the kind examiners place beside the correct one to test whether the candidate has learnt the phrase or is guessing from the sound of the word. None of them describes any real device. Remember the pair of actions, modulate while sending and demodulate while receiving, and the full form cannot be forgotten.
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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