Which of the following is an impact printer?
- A.Laser printer
- B.Inkjet printer
- C.Dot matrix printer
- D.Thermal printer
Correct answer
Explanation
The correct answer is C, dot matrix printer. Its print head carries a column of tiny pins that strike an inked ribbon against the paper, forming each character out of dots. Because the strike passes through the paper, a dot matrix printer can print carbon copies in one go, and it is noisy for the same reason.
Option A, the laser printer, uses a laser beam, a photosensitive drum and dry toner fused by heat, and nothing ever strikes the page. Option B, the inkjet, sprays extremely fine droplets of liquid ink onto the paper without contact. Option D, the thermal printer, heats chemically treated paper so that the characters appear, which again involves no impact. All three are non-impact printers. The one-line rule for the exam is that only the dot matrix, the daisy wheel and the line printers strike the paper.
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
Show answer
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
Show answer
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 →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
Show answer
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
Show answer
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
Show answer
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.
Read the full explanation →