Quiz 3
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Monitors
- Flat-screen monitors are more energy efficient than cathode ray-tube monitors. Monitor image by Kavita from Fotolia.com
There are two major categories of monitors: Cathode ray-tube or CRT and liquid crystal display, also known as flat-screen or LCD. Both measure screen size diagonally and connect to the computer via USB port or a conventional printer cord. The flat-screen monitor uses up less power and causes less eye strain.
Speakers and Headphones
- Headphones are used to turn your computer into a telephone, stereo, or video game.
Part of the sound card system that produces multimedia, speakers and headphones produce audio output. The range of audio equipment available to the average computer user is tailored to Skype users, gamers, movie and video enthusiasts, and musicians. Most headphones also include a microphone for input as well.
Printers
- Modern printers are advanced enough to publish detailed graphic arts and photos.
Printers are used to make hard copies of computer output. There are three different kinds of printers. Dot matrix is the oldest and since it is slow and rather noisy compared to laser and ink-jet printers it is no longer widely used. Laser printers are the most expensive, but are fast and quiet and Ink jet printers are inexpensive to buy, but the paper and toner consumption makes up for the cheap retail price.
Disks and External Drives
- Portable memory sticks may have rendered CDs obsolete as output devices.
CDs (which include rewritable CDs, DVDs, floppy disks and external hard drives are used as storage devices for data output. Data can be text, video, audio or graphics files. External memory drives are often portable depending on the size. Both disk drives and CDs can also be used as input devices.
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2. The characteristics of LCD monitors, LCD screens, plasma monitors, and HDTVs.
- LCD Monitor- ultra-slim, stylish,full color display devices for the PC that fit in any part of the home or office.
- LCD Screens- lightweight, aesthetically appealing, energy efficient and long-term cost effective.
- Plasma Monitors- produce rich colors along with very deep blacks,wide viewing angles allow more people to be able to watch TV comfortably, pixels of Plasma TV’s are lit individually so the pixels can be completely turned off to display truck black colors.
- HDTVs- black level, brightness, contrast, color saturation, image processing, screen composition, tuners and cable card.
3. What are the components inside the systems units.
- Processor
- memory
- adapter cards
- ports
- drive bays
- power supply
- motherboard
- chip
- Central Processing Unit
- Machine Cycle
4. The components of a processor and how they complete a machine cycle.
- Control Unit
- Arithmetic/ Logic Unit (ALU)
- Register
The machine cycle is the name of the four operations of the CPU. The first step is to 'fetch' the program instuction/data from the memory. The second step is to 'decode', which means translate the instruction into instructions. Step three is to 'execute', carry out the instruction. Finally step four is to 'store', write the result back to memory.
5. Define a bit and describe how a series of bits represents data.
When the user press any letter using the keyboard the electronic signal from that letter is sent to the system unit then the system unit convert it to its binary code and stored in memory for processing. After processing the binary code for that particular letter is converted to an image and displayed on the output device.
6.Categories of Application Software:
- Personal productivity Applications
- Multimedia and Graphics applications
- Communications applications
- Home and Educational
7. The Key Features in Business programs in terms of software is editting and typing and other stuff knowing what letters to use like formating.
8. What are the advantages of using application software on the Web.
Using web authoring software can help build web pages faster, an advantage if you are facing a deadline or a large project. There are several different types of web authoring software you can use to make great web pages without having to know all of the ins and outs of web page creation.
9. History of the Internet.
The USSR launches Sputnik, the first artificial earth satellite. In response, the United States forms the Advanced Research Projects Agency (ARPA) within the Department of Defense (DoD) to establish US lead in science and technology applicable to the military.
RAND Paul Baran, of the RAND Corporation (a government agency), was commissioned by the U.S. Air Force to do a study on how it could maintain its command and control over its missiles and bombers, after a nuclear attack. This was to be a military research network that could survive a nuclear strike, decentralized so that if any locations (cities) in the U.S. were attacked, the military could still have control of nuclear arms for a counter-attack.
