Who invented the computer mouse?
- A.Douglas Engelbart
- B.Charles Babbage
- C.Jack Kilby
- D.Christopher Latham Sholes
Correct answer
Explanation
The correct answer is A, Douglas Engelbart. 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. The name stuck because the wire coming out of the back looked like a tail.
Option B, Charles Babbage, designed the Difference Engine and the Analytical Engine in the nineteenth century and is called the Father of the Computer, a completely different title. Option C, Jack Kilby, demonstrated the first integrated circuit and belongs to the generations chapter, not to input devices. Option D, Christopher Latham Sholes, perfected the mechanical typewriter and gave us the QWERTY keyboard layout, so he is the right answer to a keyboard question and a tempting wrong one here. Keep one invention fixed against each name.
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 →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.
Read the full explanation →The print quality of a printer is measured in which unit?
- A.PPM
- B.CPS
- C.DPI
- D.LPM
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Print quality depends on how many separate dots of ink or toner the printer can place in one inch of paper, so a printer working at a higher DPI produces smoother curves and crisper small text.
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