Computer fundamental MCQ Questions and answers- Technical Aptitude

The basic unit of programmable color on a computer display or in a computer image. Pixel is also define as dots per inch, which indicates the resolution of a image. Higher the dots per inch, higher the resolution of the image.
A common resolution for laser printers is 600 dots per inch. This means 600 dots across and 600 dots down, so there are 360,000 dots per square inch.

A type of printer that produces letter-quality type. A daisy-wheel printer works on the same principle as a ball-head typewriter. The daisy wheel is a disk made of plastic or metal on which characters stand out in relief along the outer edge. To print a character, the printer rotates the disk until the desired letter is facing the paper. Then a hammer strikes the disk, forcing the character to hit an ink ribbon, leaving an impression of the character on the paper. You can change the daisy wheel to print different fonts.

A VDU is a machine with a screen which is used to display information from a computer. VDU is an abbreviation for 'visual display unit'.

An impact printer creates characters by using an inked ribbon and print head.

A flatbed plotter is a device that uses pens to draw graphics and pictures, instead of printing heads, nozzles, and ink cartridges used in typical printers.

Another difference between inkjet and laser printers is that for inkjet printers you only need ink cartridges to print, while for laser printers, you need a toner cartridge and a drum unit. Laser printers always come with a drum unit that transfers the toner powder onto paper.

A print head is the part of a printer that assembles and maintains the characters to print. It is also the component of an ink jet printer that systematically sprays ink on paper by creating images and text. It is the counterpart of the photoconductive unit or drum unit of the laser printer.

The total amount of information that a storage device or disc can hold, is known as its storage capacity. It is measure in bits or bytes.

Write protection is one of the helpful safety feature that is in built in 3.5 inch Floppy Disks. In order to ensure that nobody copies files to the 3.5 inch Floppy Disk or delete a file/s from Floppy disk, the 3.5 inch Floppy disk will be write protected.

Information on a hard disk is usually backed-up using a CD-ROM.