Basics of IT – Short Questions and Answers

Basics of IT, Questions and Answers. This is the 4th post about 1st Year | ICS Part-I Computer Science Chapter No.1: (Basics of Information Technology) | Short Questions and Answers.

The following objective questions (short questions and answers) are important for the final examinations of all Boards of Pakistan:

Chapter No.1: Basics of Information Technology

Short Questions and Answers - 4

Q.1: What is XGA?
Answer:

XGA stands for Extended Graphics Array. It supports up to 16.7 million colors at a resolution of 1024 x 768 pixels. Depending on the video display adapter memory chip, XGA will support 256,65536 or 16,777,216 colors. It is called 24-bit color or true color.

Q.2: Define CRT?
Answer:

CRT (Cathode Ray Tube) is a vacuum tube used as a display screen in a computer or video display terminal. This also is found in the television set and in-flight information monitors in the airport.

Q.3: What is a flat-panel display screen?
Answer:

The flat-panel displays are much thinner, weightless, and consume less power than CRT. It is made up of two plates of glass with a substance in between them which is activated in different ways. This is better for portable computers.

Q.4: What is LCD?
Answer:

LCD (Liquid Crystal Display) is a type of flat-panel display screen. It consists of a substance called liquid crystal, the molecules of which line up in a way that lighting behind the screen is blocked or allowed through to create an image.

Q.5: What is the Electro-Luminescent Display?
Answer:

EL (Electro-Luminescent Display) is a type of flat-panel display screen. It contains a substance that glows when it is charged by an electric current.

Q.6: What is Gas-Plasma Display?
Answer:

Gas-Plasma display is a type of flat-panel display screen. It is like a neon bulb, in which the display uses a gas that emits light in the presence of an electric current.

Q.7: Define impact printers?
Answer:

An impact printer forms character or images by striking a mechanism such as a print hammer or wheel against an inked ribbon, leaving an image on the paper. Dot matrix, daisy wheel, and line printers are examples of an impact printer.

Q.8: Define the dot-matrix printer?
Answer:

It contains a print head of small pins, which strike an inked ribbon against the paper, forming characters or images. Print heads with 9, 18, or 24 pins, with 24 pins head offer the best quality.

Q.9: Define the daisy-wheel printer?
Answer:

It uses a mechanism in the shape of a series of petals arranged on a petal wheel having a character at the end of each petal. A character comes into a print position by wheel rotation and an image is formed by the hammer strike on the desired character. It is slower than dot-matrix but better in quality.

Q.10: Define the line printer?
Answer:

Line printer is normally used by mainframe and minicomputers. It prints a whole line of characters at once rather than a single character at a time. It can print up to 3000 lines per minute.

Q.11: What is a non-impact printer?
Answer:

It forms characters or images without making direct physical contact between the printing mechanism and paper. Laser, ink-jet, and thermal printers are examples of non-impact printers.

Q.12: Define laser printer?
Answer:

Laser (Light Amplification by Stimulated Emission of Radiation) printer is similar to a photocopying machine and it uses the principle of dot-matrix printers of creating images with dots. These images are created on a drum treated with a magnetically charged ink-like toner and then transferred from drum to the paper.

Q.13: Define thermal printer?
Answer:

It uses colored waxes and heat to produce images by burning dots on special paper. It produces a high-quality printout but is quite expensive.

Q.14: What is a plotter?
Answer:

A plotter is used to produce high-quality graphics in many colors and for specialized applications i.e. architectural drawings, maps, graphs, and charts.