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Tugas Pengantar Teknologi Informatika (kelompok) untuk mereview bab-bab yang sudah dipelajari sebelum UTS
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CHAPTER REVIEW 1
Self-test questions
1. The World Wide Web (www) refers to the part of the internet that presents information in multimedia form.
2. The two main types of microcomputers are the PC deskop, Which sits on the deskop, And the PC tower, which usually is placed on the floor.
3. "comunication technology" merges komputing with high-speed communications.
4. A computer is an electronic manchine that accepts data and processes it into informations.
5. The internet is a worldwide network that connects hundreds of thousands of smaller networks.
6. Multimedia refer to information presented in nontextual forms such as video, sound, and graphics.
7. Supercomputer are high-capacity machines with thousands of processors.
8. Embedded computers, or microcontroller, are installed in "smart" appliances and automobiles.
9. The kinds of software that enable users to perform specific tasks in called application software.
10. RAM is an example of primary storage, and a hard drive is an example of secondary storage.
11. A network is a communications system connecting two or more commputers.
12. The four basic operations of all computers are input operations, processing operations, storage operations, and output operations.
13. The first programmable computers in a USA, which appeared in 1946, was called the ENIAC.
14. The Monitor is the display device that takes the electrical signals frrom the video card and forms an image using points of colored light on the screen.
15. The base material for computer processing device is silicon, a natural element found is sand.
16. The general term for all the machinery and equipment in a computer, system is hardware.
17. Keyboard and Mouse are the two mos common input devices.
18. The processor chip, commonly called the processor or a CPU, is a tiny piece of silicon that contains millions of miniature electronic circuits.
19. One gigabyte is approximately 1 milyar characters.
Multiple-choice questions
1. which of the following devices converts computer output into displayed images?
b. monitor
2. which of the following computer types is the smallest?
c. microcontroller
3. which of the following is a secondary storage devices?
c. floppy-disk drive
4. Since the days when computers were first made available, computers have developed in three directions what are they?
b. miniaturization
5. which of the following operations constitute the four basic operatios followed by all computers?
c. programming
6. suprcomputers are used for?
c. weather forecast
7. what is the leading use of computers?
d. word processing program
8. which is the main board in the computer?
c. motherboard
9. A terabyte is approximately?
c. one trillion characters
10. speakers are an example of?
B. An output device
True/false questions
1. Mainframe computers process faster than microcomputers.
True
2. Main memory is a software component.
false
3. The operating system is part of the system software.
True
4. Processing is the manipulation by which a computer tranforms data into information.
True
5. Primary storage is the area in the computer where data or information is held permanently.
false
6. The keyboard and the mouse are example of input devices.
True
7. Movies area a form of multimedia.
True
8. Computers are becoming larger, slower, and more expensive.
false
9. Modems store information.
false
10. A microcomputer is used to view very small objects.
false
11. A floppy disk is an example of software.
false
12. computers continue to get smaller and smaller.
True
13. A CD-ROM can store more data than a floppy disk can.
True
14. supercomputers are particularly inexpensive.
True
short-answer questios
1. What does online mean?
using a computer or other information sources are connected to the network to access information and services from other computers or resources.
2. What is the diference between system software and application software?
system software used to help computer key operational tasks, while the application functions software to help with specific tasks such as problem solving, task, or simply seeking entertainment.
3. Briefly define cybeyspace.
terms are not limited to the online world and the Internet in particular, but also the world's wired and wireless communications in general as non-physical area created by computer and communication systems
4. What is the diference between software and hardware?
the hardware is all the machinery and equipment on the computer while the software or program consists of instruction-electronic instructions that ask the computer doing certain tasks step by step
5. What is the local area network?
LAN (Local Area Network) is a network that is usually connected by cable, consisting of a set of desktop PCs and other devices, such as printers, located in an office or building.
6. what is multimedia?
Multimedia (derived from the multi / many) is a technology that provides information on more than one media, such as text, images, video, sound, and animation, in the form of integrated communications.
7. What is the diference between microcompters and supercomputers?
microcomputers or PCs worth 500-5000 dollars, widely used novice user, as well as a lot of replacing mainframes, whereas supercomputer worth 350 million dollars or more, are
used for tasks that can not be dealt with mainframe or lower engine such as for research, weather forecasting and design airplanes
8. What is the function of RAM?
RAM serves to store data that is about to be processed and store information before processing the results sent to the output dadn secondary storage devices.
9. What does downloading mean?
Download is a retrieve data from computers that are far away on the other side to save to your computer.
10. What is meant by connectivity?
Connectivity associated with the relationship between a single computer with other computers using communication lines to provide access or information online and sharing components.
11. Describe sone ways that information technology can be used to help people find jobs and to help jobs fibd people.
With information technology, we are able to find a job that we want.
12. Compare the use of email to the use of the telephone and of conventional letters sent via the postal system. Which kinds of communications are best suited for which mediium?
Email is electronic mail that is very popular since the beginning of its launch. Even the number of email users has far exceeded the number of users of other communication tools, ie, telephone and postal mail.
CHAPTER REVIEW 2
Self-test questions
1. Today's data transmission spedds are measured in bps, Kbps, mbps, and gbps.
2. A(n) cable modem connects a personal computer to a cable-TV system that offers an internet conection.
3. A space station that transmits data as micriwaves is a satellite communications
4. A company that conects you through your communications line to its server, which conects you to the internet, is a(n) Internet Service Provider (ISP)
5. A rectangular area on the computer screen that contains a document or display an activity is called a(n) window
6. flaming is writing an online message that uses derogatory, obscene, or inappropriate language.
7. A(n) browser web is software that enables users to view web pages and to jump from one page to another.
8. A computer with a domain name is called a(n) server
9. HTTP comprises the communications rules that allow browser to conect with wed severs.
10. A(n) plug-in is a program that adds a specific feature to a browser, allowing it to play or view certain files.
11. Unsolicited email in the form of advertising or chain letters is known as spam
12. The expression of how much data-text, voice, video, and so on-can be sent through a communications channel in a given amount of time is known as bandwidth
13. A(n) URL is a string of characters that points to a specific piece of information somewhere on the web.
14. Some websites may leave files left on your hard disk that contain information such as your name, password, and preferences; they are called cookies
15. Using trusted instutional names to elicit confidential information is called phising
16. The kind of spyware that can record each character you type and transmit that informations to someone else on the internet, making it possible for strangers to learn your password and other informstion, is called key logger
Multiple-choice questions
1. Kbps means___bits per second.
b. 1 thausand
2. A location on the internet is called a(n)
c. domain
3. In the email addres [email protected], kim_lee is the.
d. user ID
4. Which of the following is not one of the four components of a URL?
c. name of the browser
5. Which of the following is the fastest method of data trransmission?
d. T1 line
6. Which of the following is not a netiquette rule?
b. flame only when necessary
7. Which protocolis used to retrieve email messages from the server to your computer?
b. SMTP
8. Who owns the internet?
e.
9. Each time you connect to your ISP, it will assign your computer a new addres called a(n)
b. IP address
10. ISP is that don't run their own backbones connect to internet backbone through a
d. TCP/IP
11. which of the following is not a protocol?
b, IE
12. the sending of phony email that pretendsto be from a credit-card company or bank, luring you to a website taht attempts to obtain comfidential information from you, is called
b. phising
True/false questions
1. POP3 is used for sending email, and SMTP is used for retrieving email.
True
2. A dial-up modem is an ISP
false
3. Replying to spam email message with the statement "remove" will always get spammers to stop sending you unsolicited email.
false
4. All computer communications use the same bandwidth.
false
5. A T1 line is the slowest but cheapest form of internet connection.
false
6. A dinamic IP addres gives you faster internet acces than a static IP addres does.
true
7. A bookmark lets you return a favorite website quickly.
true
8. Radio buttons are used for listening to radio stations on the internet.
false
9. Spofing means using fake email sender names.
true
10. Hypertext refers to text presented with very lsrge letters.
false
short-answer questios
1. Name three methods of data transmission that are faster than a regular modem connection.
ISDN lines, DSL, and IT
2. What does log on mean?
make the connection to the remote computer
3. What is netiquette, and why it is important?
appropriate behavior when online. Net-etiquette is important that neither party be sad or hurt
4. Briefly define bandwidth.
amount of data (text, voice, video, etc.) that can be sent over the communication lines in units of time
5. Many webs documents are "linked" what does that mean?
most of web documents ter-link means the documents related to each other.
6. Compare and contrast a cable modem service to a DSL service.
cable modem is a device that connects a personal computer to a cable TV system to get an internet connection. The cable modem sends data faster than a standard modem
7. Explain the basics of how the internet works.
upload and download with intermediaries wired or wireless connection
8. What expanded functions does IMAP have?
Additional functionality is contained in IMAP we can find e-mail messages while email is still on the server before we download it
9. Briefly explain what TCP/IP does.
TCP / IP allows all computers using data transmitted over the Internet to determine the type of error checking error is used, the data compression method, how the devices sending signals that it has completed meneima message.
10. Why was ICANN established?
ICANN was established to set up a domain name that is easy to understand humans to Internet users avoid fraud, privacy, protection of intellectual property rights, etc
11. What's the difference between a dynamic IP addres and a static IP addres?
dynamic IP address is the IP address changing every time we connect to the internet. When we request data from the Internet, the actual data is transmitted to the computer IP address. When we disconnect the Internet connection, the ISP took back the IP address that we will use and give it to another user. While the static IP address is fixed every time we log on to the internet.
12. Explain what a blog is.
intenet journals
13. How would you answer a person who asked you the questions " who owns the internet?"
Internet is not actually owned by one person alone, but shared by all users. However, each user should follow the rules made by the ISOC
14. Explain the difference between a "mega-portal" and a "vortal"
mega portal is a portal (gateway sites that serve as 'anchor sites' and provide and provide a diverse set of services and resources) public, such as Yahoo!, AOL, Microsoft Network (MSN), Lycos, or Google.
15. What is B2B commerce?
B2B (business-to-business) commerce is a sale or exchange of goods and services electronically and directly between firms that can cut the cost of intermediaries.
16. list and briefly describe three kinds of spyware.
adware, browser hijacker, and search hijacker
CHAPTER REVIEW 3
self-test qustions
1. System software enable the computer to perform essential operating tasks.
2. Utility program is the term for programs designed to perform specific tasks for the user.
3. Multitasking is the activity in which a computer works on more than onne process at a time.
4. Flagmentation is the scattering of portions of files about the disk in nonadjacent areas, thus greatly slowing access to the files.
5. Windows and mac OS area generally used on personal computers.
6. Boot Is the process of loading an operating system into a computer's main memory.
7. A(n) defragmentation is a utility that will find all the the scattred files on your hard disk and reorganize them as continguous files.
8. The operating system is the component of system software that comprises the master system program that manage the basic operations of the computer.
9. The window is the user-controllable display screen that allows you to communicate, or interact with your computer.
10. Disk scanner and disk cleanup utilities detect and correct certain type of common problems on hard disks, such and removing unnecessary files called temporary files that are created by windows only for short tasks and system restore after system problems.
11. OSs allow user to control access to their computers via use of a The main program and the low-level program.
12. Software or hardware that is commercial means that it is privately owned and controlled by a company.
13. Linux is open-source software meaning any programmer can download it from the internet for free and modify it with suggested improvements.
14. When you power up a computer by turning on the power "on" switch, this is called a cold boot. if your computer already on and you restart it, this is called a warm boot.
15. Word processors software allows you to create and edit document.
16. Scrolling is the activity of moving upward or downward through the text or other screen display.
17. Name for editing features offered by word processing programs : nsert, delete, find, replace.
18. In a spreadsheet, the place where a row and column intersect is called a grid.
19. The cursor is the movable symbol on the display screen that shows you where you may next enter data or commands.
20. When you buy software, you pay for a software license, a contract by which you agree not to make copies of the software to give away or resell.
21. Records in the database are sorted according to a key
22. Deskop publishing involves mixing text and graphics to produce high-quality output for commercial printing.
23. A spreadsheet allows users to creat table and do "what-if" financial analyses by entering data and formulas into rows and columns arranged as a gird on a display screen.
24. wordwrap automatically continous text to the text line when you reach the right margin.
25. Settings that are automatically used by a program unless the user specifies otherwise are called The default setting.
26. public-domain software is not protected by copylight and may be copies by anyone.
27. device driver are specialized software programs that allow input and output device to communicate with the rest of the computer system.
Multiple-choice questions
1. Which the following are functions of the operating system?
2. Which of the following what the first major microcomputers OS?
3. Whitch of the following is a prominent operating network system?
4. Which of the following is the newest microsoft windows operating system?
5. Which of the following refers to the execution of two or more programs by one user almost at the same time on the same computers with one central processor?
6. Which of the following are specialized software program that allow input and output device to communicate with the rest of the computer system?
7. Which of the following is not an advantage of using database software?
c. shrinkage of the structure
8. Which of the following is (are) not a type of menu?
b. pop-in menu
9. Which of the following is not a feature of word processing software?
b. cell address
10. What is the common consumer computer interface used today?
b. graphical interface
11. Which type of software can you download and duplicate without any restrictions whatsoever and without fear of legal prosecution?
c. public-domain software
True-false questions
1. The supervisor manages the CPU
True
2. The first graphical user interface was provide by microsoft windows.
false
3. Formatting a floppy disk will not affect any data alrady written on it.
false
4. All operating system are mutually compatible.
false
5. Font refers to a performatted document that provides basic tool for shaping the final document.
false
6. Unix crashes often and thus is not normally used for running important large system.
false
7. Windows NT is the most recent microsoft OS.
false
8. Spreadsheet software enable you to perform what-if calculations.
True
9. Rentalware is software that users lease for a fee.
True
10. Public-domain software is protect by copyright and so is offered for sale by license only.
false
11. The records within the various table in a database are link by a key field.
True
12. QuarkXpress, Adobe inDesign, and Adobe pageMaker are professional deskop-publishing programs.
True
13. The best-known graphical user interface is the command-driver one.
false
14. Microsoft powerpoint and corel presentations are example of financial software.
false
15. Drawing program create vector images and painting program produce bit-mapped images.
True
16. General computer users can design their own web page using macromedia flah, and microsoft frontpage.
false
Short-answer questions
1. Briefly define booting.
Booting is the process of placing the operating system into the computer's main memory.
2. What is the difference between a command-driven interface and a graphical user interface(GUI)?
To use a computer that has a command-driven interface, need to type in a fairly complicated instructions
3. What can't you run your computer without system software.
The computer can not run without system software as the main component of the system software operating system is the master control program that runs the computer.
4. Why is multitasking useful?
Multitasking is beneficial because with multitasking, komputern antarprogram can switch quickly.
5. What is the device driver?
Device drivers are programs that are designed specifically for the input and output devices that can communicate with other computer components that the operating system can recognize and undergo computer hardware peripherals.
6. What is a utility program?
Utility program is a component of the operating system to perform tasks related to the control and allocation of computer resources.
7. What is a platform?
The platform is a model of the processor and operating system used as the basis of a computer.
8. What are three components of system software? what is the basic funtion of it?
The three components of the system software is the operating system (major components of software systems), device drivers (to help the computer to control
peripheral devices), and utility programs (for support, mempeluas, and enhance capabilities of existing computer programs).
9. What is open-source software?
Open-source software is software that can be downloaded from the internet for free and can be modified as improvements have been suggested, but the changes should not be patented so that other people can access and remain in the public domain.
10. What does defragmenting do?
Defragmentation is the process of finding the data randomly scattered when new data storage on disk spaces are empty and reset the location to be sequential.
11. What is an embedded system?
Embedded systems are specialized computer systems as part of the system or the larger machines, commonly used in cars, airplanes, trains, spaceships, machine tool, watches, appliances, cell phones, PDAs, and robots.
12. What are the following type of aplication software used for?
a. Project management software.
project management software to plan and schedule the work of people, costs, and other resources needed to complete the project to be on time.
b. Deskop-publishing software.
desktop-publishing software functions to adjust the characteristics of typography and colorful work.
c. Database software.
database software functions to create and manage the database as well as to access the data.
d. Spreadsheet software,
spreadsheet software is used to make tables and financial scheduling by entering data and formulas in a row not a column in the grid is formed as a layer.
e. Word processing software.
function word processing software to create, edit, format, print and save text material.
13. Which programs is more sophisticated, analytical graphics or presentation graphics? Why?
presentation graphics, because presentation graphics uses graphics, animation sound, and data or information to make visual presentation while analytical graphics only convert numeric data into graph to make it easier to analyzed.
14. How are the following different? pop-up menu; pull-down menu; cascading menu.
pop-up menu contains a series of commands in any part of the screen when you click the right mouse button, pull-down menu contains a set of commands that is pulled from the menu bar in the upper layer, while the cascading menu is a new menu that appears when selecting one command.
15. What is impirting? Exsporting?
import file is the retrieval of data from other sources and then convert it in a form that is compatible with the program being executed, while the export file is the conversion of data into a form that can be used in another program and then transmitted.
16. Briefly campare drawing programs and painting programs.
drawing program to make users able to design and illustrate an object or product in the form of vector image, while the program for coloring allows users to perform on-screen color simulation that produces an image bit-map or raster images are composed of tiny dots.
17. Explain what computer-aided design (CAD) programs do.
program computer-aided design (CAD) is aimed at designing products, structures, civil engineering drawings, and maps.
18. Discuss the various software licenses: site licenses, concurrent-use licenses, multiple-user licenses, single-user licenses.
site license means the software can be used on all computers in a specific location, concurrent-use license means the number of copies of the software can be used at the same time, multiple-user license means limiting the number of people who can use the software, while a single-user license means that only one user at a time
CHAPTER REVIEW 4
Self-test questions
1. A(n) kilobyte is about 1,000 bytes; a(n) megabyte is about 1 million bytes; a(n) gigabyte is about 1 billion bytes.
2. The chip is the part of the microprocessor that tells the rest of the computer how to carry out a program’s instructions.
3. The process of retriving data from a strorage device is referred to as read the process of copying data to a storage device is called write.
4. To avoid losing data, user should always backup their files
5. Formatted disks have lands and pits that the system software uses to referance data locations
6. The chip microprocessor / CPU is often referred to as the brain of a computer
7. The electrical data roadways through which bits are transmitted are called bus
8. A cable connected to a serial port sends bits one at a time, one after the other; a cable connected to a parallel port sends 8 bits simultaneously
9. Part of the diskdrive mechanism, the read / write head transfers data between the computer and the disk
10. RAM chips also called main memory and are critical to computer performance
11. Arithmetic operations are the fundamental math operation: addition, substraction, multiplication, and division. logikal operations are comparisons such as”equal to”,”greater than,”or less than”
12. A group of 8 bits is a byte
13. The extrabit attached to the end of a byte for error checking is a parity bit
14. A tiny electronic device that acts as an on/off switch, switching between “on” and “off” millions of times per second is called a transistor
15. Flash memory chips is a form of flash memory media that plugs into a special port in a digital camera, camcorder, notebook PC, or photo printer and holds up to 1 gigabyte of data.
Multiples-choice questions
1. Which of the following is another term for primary storage ?
d. RAM
2. Which of the following is not included on a computer’s motherboard ?
c. keyboards
3. Which of the following is used to hold data and instruction that will be used shortly by the CPU ?
c. RAM chips
4. Which of the following coding schemes is widely used on microcomputers ?
c. ASCII
5. Which of the following is used to measure processing speed in microcomputers ?
d. megahertz
6. Which expansion bus specializes in graphics processing ?
d. AGP
7. Which cmpany is the main manufacturer of microphone processors for non apple computers ?
a. intel
8. Which element is commonly used in the making of solid state integrated circuits ?
e. silicon
9. DVD-Rs allow
b.
True/false questions
1. A bus connects a computers control unit and ALU
false
2. The machine cycle comprises the instruction cycle and the execution cycle
True
3. Magnetic tape is the most common secondary storage medium used with microcomputers.
True
4. Main memory is onvolatile
false
5. Pipelining is a method of speeding up processing
True
6. Today’s laptop computers can perform more calculations per second than the ENIAC an
enormous machine occupying more than 1,800 square feet and weinghing more than 30 tons.
false
7. USB can theoretically connect up to 127 peripheral devices
True
8. A petabyte is approximetely 1 quadrillion
True
9. Online secondary strorage services test your computer’s RAM capacity
false
10. Keychain memory is a pipelening device
false
Short-answer questions
1. What is ASCII , and what do the letters stand for ?
ASCII (American Standard Code for Information Interchange) is a binary code that is widely
used microcomputers.
2. Why should measures of capacity matter to computer users ?
Computer users need to know the measurements of the capacity / speed .
3. What’s the difference between RAM and ROM ?
RAM (Random Access Memory) primary storage or main memory is volatile. While the ROM (Read Only Memory) is non-volatile, can not be written or deleted by the user's computer without special tools.
4. What is the significance of the term megahertz ?
megahertz term is important because the higher the megahertz, the faster the processing of data in a computer anyway.
5. What is a motherboard ? name at least four components of a motherboard
motherboard is the main circuit board on the CPU. Motherboard components include: microprocessor chip, chip RAM, sound card, VGA card, etc.
6. What are the most conveinient forms of backup storage ? why ?
backup storage that is easy and convenient to use including servers, CD / DVD, Zip disk, flash memory / media such as MP3 players can store backup data wantu us in a long time so the data we will not be easily lost / damaged
7. Why is it important for your computer to be expandable ?
computer should easily be expanded to facilitate the upgrading and adding new features in the computer
8. What are three users of a smart card ?
3 is an example of the use of smartcard credit cards, student cards, and cards visit to the building
9. What is nano technology ?
nano technology is a technology that operates at the level of atoms and molecules
10. What are the uses of a surge protector voltage regulator and UPS and why are these devices
important ?
This fuse to protect electrical equipment from the current ride, stavoll useful to protect the equipment from the electrical current is not stable, while useful as a UPS battery backup if power is suddenly lost so that we can still keep our jobs first.
11. Explain the binary system
binary system is a system used as a representation of the data on the computer, use only the two digits 0 and 1. on the computer, 0 means off and 1 means the electric power is. Thus, all data and program instructions are represented by the computers handled binary numbers.
12 what are unicode and ASCII ?
Unicode is a binary encoding scheme that uses 2 bytes (16 bits) for each character. While ASCII is a binary code used microcomputers.
13. why is silicon used in the manufacture of microphone processor ?
Silicone is used in the manufacture of microprocessors because silicon is a semiconductor so as to create an electronic circuit IC, which is conductive enough material placed on top of the silicon.
14. what is bluray used for ?
benefits of blu-ray is able to record, rewrite, and play HD video, and can also be used to store data that are very large.
CHAPTER REVIEW 5
Self-test questions
1. A(n) dumb terminal is entirely dependent for all its processing activities on the computer system which it is connected
2. The two main categories of printer are impact and non-impact3. ergonomics is the study of the physical relationships between people and their work
enviroment
4. A (n) trackball is an input device that is rolled about on a desktop and directs a pointer on the computer’s display screen
5. hardware input output consists of devices that translate information processed by the computer into a form that humans can understand
6. biometric is the science of measuring individual body characteristic7. CRT is short for cathode-ray tube8. LCD is short for liquid crystal display9. A PDL is software that describes the shape and postion of characters and graphics to the
printer10. When people in different geographic locations can have a meeting using computers and
communications it is calles video conferencing11. active matriks screens are much brighter and sharper than passive matrix screens but they
are more complicated and thus ,ore expensive12. A debilitating condition caused by presurre on the median nerve in the wrist producing
damage and pain to nerves and tendons in the hands, is called CTS13. The measure of the numbers of dots that are printed in a linear inch is called DPI or dots per
inch14. A printer that forms characters or images by striking a mechanism such a print hammer or
wheel against an inked ribbon, leaving images on a paper , is called a(n) impact printer15. laser printers enabled the development of desktop publishing
Multiple-choice questions
1. Which of the following is not a pointing device ?
c. keyboard
2. Which of the following is not a source data entry device ?
e. mouse
3. Which of the following display standars has the highest screen resolution ?
e. QXGA
4. Which of the following isn’t considered hard copy output ?
d. word document computer file
5. Which of the following factor does not affect the quality of a screen display ?
b. speed
True/false questions
1. On a computer screen , the more pixels that appear per square inch, the higher the resolution .
True
2. Photo taken with a digital camera can be downloaded to a computer’s harddisk
True
3. Resolution is the amount of space between the centers of adjacent pixels
false
4. The abbreviation dpi stands for “ dense pixel intervals.”
false
5. Pointing devices control the position of the cursor on the screen
True
6. Output consist of devices that translate information prosessed by the computer into a form that humans can understand
True
7. Scanner use a driver called TWAIN
True
8. Optical character recognition software reads bubble marks and coverts them into computer usable form
false
9. The lower the refresh rate, the more solid the image looks on the screen
false
10. CRT’s comsume more power than flat panel displays do
false
11. Computers users have no need to be concerned about ergonomics
false
12. It has been proven that electromagnetic fields pose no danger to human beings
false
13. Plotters are used to print architectural drawings and in computer aided design
True
Short-answers question
1. What is a common use of dumb terminals ?
Dumb terminals are commonly used by employees to access online aircraft mainframe computer containing flight information
2. What characteristic determine the clarity of a computer screen ?characteristics that determine the level of sharpness of a computer screen is a dot
pitch, resolution, color depth or color depth, and refresh rate.3. Describe two situations in which scanning is useful ?
very useful to scan barcodes (barcode of goods in supermarkets) and print media scan (scanner).
4. What is source data entry ?Data entry is the source of the data to be entered into the computer for processing
5. What is pixel short for ? wjat is a pixel ?pixel (picture element) is the smallest unit that can be created on the screen on and
off or have different levels of darkness.6. Briefly describe RSI and CTS, why are they problems ?
RSI (repetitive stress / strain injury) is a pain in the wrists, arms, and neck muscles kareba must work quickly and repeatedly.
7. What is a font ?letters (font) is the alphabetic character that is read by the computer as a code (such
as ANSI or ASCII code)8. Discuss the different types of printers and their features
other types of printers are impact printers (forming characters or images by a specific mechanism, such as print hammer or a ball on the inked ribbon, which raises the image to paper) and non-impact printers (form characters and images without the need for physical contact-direct printing mechanism and paper).
9. Explain the different between CRT monitors and LCD monitorsCRT monitor is a monitor with a vacuum tube used as a computer screen or a video
terminal, while the LCD monitor is thinner, lighter and more power efficient; made of two discs of glass separated by a layer where light manipulation
10. What is OCR used for ?OCR (optical character recognition) function to convert text from scanned form
image (image text) into text format that can be edited (usually ASCII) that can be imported and be changed in the application pngolah said.
CHAPTER REVIEW 6
Self-test questions
1. A(n) modem converts digital signals into analog signals for transmission over phone lines2. A(n) WAN network covers a wide geographic area, such as a state or a country3. optical fiber cable transmits data as pulses of light rather than as electricity
4. analog refers to waves continously varying in stretgh and/or quality digital refers to comunications signals or information in a binary form
5. A VPN is a private network that uses a public network usually the internet to connect remote sites
6. A (n) file server is a computer that acts as a disk drive. Storing programs and data files shared by users on a LAN
7. The HUB is the system software that manages the activities of a network8. Modem is short for modulation / demodulation9. bluetooth is a short range wireless digital standard aimed at linking cellphones PDA’s
computers and peripheral up to distances of 30 feet; wi-fi is a short range wireless digital standard aimed at helping portable computers and handheld wireless devices to comunicate at high speeds and share internet conections at distances of 50-150 feet
10. antivirus programs can screen out objectionable material on the internet11. Any device that is attached to a network is called a malware12. A set of conventions governing the exchange of data between hardware and software
component in a comunications network is called a ethics of file-sharing
Multiple choice questions
1. Which of the following best describes the telephone line that is used in most homes today ?c. twisted-pair wire
2. Which of the following do LAN enable ?e. all of these
3. Which of the following is not a type of server ?d. disk server
4. Which of the following is not a short distance wireless standard ?b. PDA
5. Which type of LAN connects all devices through a central hub, such as a file server ?b. star network
6. Which is the type of LAN in which all michrophone on the network communicate directly with one another without relying on a server ?
c. peer to peer7. How do fiber optic cables trasmit data ?
e. via pulsating beams of light
True/false questions
1. In a LAN, a bridge is used to connect the same type of networks, whereas a gateway is to
enable dissimilar networks to communicate
True
2. Frequency and amplitude are two characteristics of analog carrier waves
True
3. A range of frequencies is called a spectrum
True
4. Twisted pair wire commonly connects residences to external telephone systems
True
5. Photonics is the science of sending data bits by means of light pulses carried on hair thin glass
fibers
True
6. Wifi signals can travel up to 300 feet
false
7. Microwave trasmissions are a line of sight medium
True
8. 2G is the newest cellphone standard
false
9. Wifi is formally known as a 802.11 network
True
10. A trojan horse copies itself repeatedly into a computers memory or onto a hard drive.
false
Short-answes questions
1. What is the difference between an internet and an extranet ?internal intranet is a private network within an organization that uses the
infrastructure and standards of the Internet and the web, while private intranet extranet is that not only connects internal personnel, but also the selected suppliers and other parties are seen as strategic.
2. What is the difference between LAN and WAN ?WAN is a communications network that covers a very wide geographical area, for
example in a country or the world, while the LAN is a local network that connects computers and devices in a limited geographical coverage, for example in an office, a building, or a collection of adjacent buildings.
3. What is the bandwidth a factor in data transmission bandwidth is a factor in the transmission of data due to the wide bandwidth of the
media, then the transmission can take place more quickly.4. What is a firewall ?
firewall is a system of hardware and or software that protects a computer or network from intruders.
5. What do 2G and 3G mean ?
2G is a digital wireless service using the network of cell towers to transmit voice and data communications over the airwaves in digital form. 3G is a standards-based broadband technology and support U.S. GSM device that is always on, capable of carrying data at high speed, can receive emails without attachments, providing internet access and web, display color video and still image and buses playing music.
6. Explain the difference between ring bus and star networks on aringan ring, all microcomputers and other communication devices are
connected in a continuous loop around the circle and messages that reach their destination.7. What is the electromagnetic spectrums ?
electromagnetic spectrum is electrical energy and magnetic energy that goes in waves, including radio signals, X-ray and radioactive rays.
8. What does a protocol do ?protocol kompnen organize data exchange between hardware and or software in
network communication.9. What are the three basic rules for creating passwords ?
basic rules to make passwords: do not notify your username and password to anyone, do not use easily guessed passwords, and avoid words that may appear in the dictionary.
10. What do we need encryption for ?This encryption to prevent access from unauthorized people.
