Basic Basic Information Technology Interview Preparation Guide

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A small ball that is set in a holder and can be rotated by hand to move a cursor on a computer screen.

A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electrical ones.

A MIDI keyboard is typically a piano-style user interface keyboard device used for sending MIDI signals or commands over a USB or MIDI cable to other devices connected and operating on the same MIDI protocol interface.

Component Object Model (COM) is a binary-interface standard for software components introduced by Microsoft in 1993. It is used to enable inter-process communication and dynamic object creation in a large range of programming languages.

A Projection panel is a device that, although no longer in production, was used as a data projector is today.
It works with an overhead projector (OHP). The panel consists of a translucent LCD, and a fan to keep it cool. The projection panel sits on the bed of the OHP, and acts like a piece of OHT transparency. The panels have a VGA input, and sometimes Composite (RCA) and S-Video.

A device that is used to project rays of light, especially an apparatus with a system of lenses for projecting slides or film on to a screen.

It has scanner to scan the document and also have printer to Print the document.

A Network interface card, NIC, or Network card is an electronic device that connects a computer to a computer network, usually a LAN. It is considered a piece of computer hardware.

A combined device for modulation and demodulation, for example, between the digital data of a computer and the analogue signal of a telephone line.

A system in which information can be expressed by combinations of the digits 0 and 1.

One thousand-millionth of a second.

DOS (Disk Operating System) was the first widely-installed operating system for personal computers. Earlier, the same name had been used for an IBM operating system for a line of business computers.

A data cable is any media that allows base-band transmissions (binary 1,0s) from a transmitter to a receiver. Coaxial cable is sometimes used as a base-band digital data cable, such as in serial digital interface and thick-net and thin-net.

A light-emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright, but in most LEDs it is monochromatic, occurring at a single wavelength.

The plotter is a computer printer for printing vector graphics. In the past, plotters were used in applications such as computer-aided design, though they have generally been replaced with wide-format conventional printers. A plotter gives a hard copy of the output. It draws pictures on paper using a pen.

A machine that prints output from a computer a line at a time rather than character by character.

Dot matrix printing or impact matrix printing is a type of computer printing which uses a print head that moves back and forth, or in an up and down motion, on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper, much like the print mechanism on a typewriter.

Impact printer refers to a class of printers that work by banging a head or needle against an ink ribbon to make a mark on the paper. This includes dot-matrix printers, daisy-wheel printers, and line printers.

A dye-sublimation printer (or dye-sub printer) is a computer printer which employs a printing process that uses heat to transfer dye onto materials such as a plastic, card, paper, or fabric.

A printer linked to a computer producing good-quality printed material by using a laser to form a pattern of electrostatically charged dots on a light-sensitive drum, which attract toner (or dry ink powder). The toner is transferred to a piece of paper and fixed by a heating process.

A virtual printer is a piece of computer software whose user interface and API resemble that of a printer driver, but which is not connected with a physical computer printer.

3D printing or additive manufacturing is a process of making three dimensional solid objects from a digital file. The creation of a 3D printed object is achieved using additive processes. In an additive process an object is created by laying down successive layers of material until the entire object is created.

Daisy wheel printing is an impact printing technology invented in 1969 by David S. Lee at Diablo Data Systems. It uses interchangeable pre-formed type elements, each with typically 96 glyphs, to generate high-quality output comparable to premium typewriters such as the IBM Selectric, but two to three times faster.

A machine for printing text or pictures, especially one linked to a computer.

A power supply unit (PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use a switched-mode power supply. Some power supplies have a manual selector for input voltage, while others automatically adapt to the supply voltage.