The Answer of Chapter 10

True/False

    1.   T

    2.   T

    3.   F

    4.   T

    5.   F

    6.   F

    7.   T

    8.   T

    9.   F

    10. T

Multiple Choices

    1. B

    2. A

    3. D

    4. B

    5. A

    6. B

    7. B

    8. A

Matching

    1.  E

    2.  G

    3.  C

    4.  B

    5.  J

    6.  A

    7.   I

    8.  D

    9.  H

    10. F

Short  Answer

1.      Validation is the process of comparing data with a set of rules or values to find out if the data is correct

Alphabetic checks, numeric checks, range checks, consistency checks, completeness checks.

2.      In data redundancy each department or area in an organization has its own files in a file processing system, by duplicating data it wastes resources such as storage space and people’s time, also data redundancy can increase the chance of error.

Isolated data often it’s difficult to access data stored in separate files in different department. Sharing data from multiple, separate files to generate such a list in a file processing system often is a complicated procedure and usually requires the experience of a computer programmer.

3.      Database approach , programs and user share the data in the database

Reduces Data Redundancy, most data items are stored in only one file, which greatly reduces duplicated data.

Improved data Integrity, when users modify data in the database, they make change to one file instead  of multiple files.

Shared data, The data in a database environment belongs to and is shared, usually over a network, by the entire organization.

Easier Access, the database approach allows nontechnical users to access and maintain data, providing they have the necessary privileges.

Reduces Development Time, it often is easier and faster to develop programs that use the database approach.

4.      First, select the fields from the Available Fields list you want to be displayed in the resulting query. Second, Assign a name to the query, so that you can open it later. Third view the query result on the screen.

Query by example is a feature that has a graphical user interface to assist users with retrieving data.

5.      They can store more type of data, access this data faster, and allow programmers to reuse object.

A multimedia database stores images, audio clips, and/or video clips, for example, a GIS database stores maps and other geographic data.

A groupware database stores documents such as schedules, calendars, manuals, memos, and reports.

A computer-aided design database stores data about engineering, architectural, and scientific design.

A hypertext database contains text links to other types of documents. A hypermedia database contains test, graphic, video, and sound.

The Answer of Chapter 9

True/false

    ·        T

    ·        F

    ·        T

    ·        F

    ·        T

    ·        T

    ·        F

    ·        T

    ·        F

    ·        T

    ·        T

Multipe Choices

    ·        C

    ·        C

    ·        C

    ·        D

    ·        B

    ·        A

    ·        D

    ·        B

Matching

    ·        E

    ·        J

    ·        H

    ·        D

    ·        F

    ·        A

    ·        G

    ·        B

    ·        C

    ·        I

Short Answer

    1.      Text Messaging is a mobile device with text messaging, also called SMS(Short Message Service), capability allows users to send and receive short text messages, typically fewer than 300 characters, on a phone or other mobile device or computer.

Mobile to mobile, mobile to E-mail, Web to Mobile, Mobile to Provider

     2.      It consist of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the receiver’s geographic location.

GPS can be uses  to assist people with determining where they ar located, creating a map, ascertaining the best road between two points, locating a lost person or stolen object, determining altitude, and calculating speed, give information about nearby points of interest. In nowdays many vehicles and mobile devices such as smart phone use GPS to provide drivers with directions or other information, and also GPS receivers work in conjunction with a cellular wireless network. Parents, for example, can locate a child’s wherebouts through a cell phone equipped with a GPS receiver.

      3.      Lan is a network that connects computers and devices in a limited geographical area such as a home, school computer laboratory, office building, or closely positioned grup of buildings.

MAN (metropolitan area netwok) is  a high speed network that connects local area networks in a metropolitan area such as a city or town and handles the bulk of cummunications activity across that region.

WAN(Wide area network) is a network that covers a large geographic area like a city, country, or world, using a communications channe; that combines many type of media such as telephone lines, cables,and radio waves .

Wireless LAN is a Lan that use no phsical wires

      4.      Network Topology refers to the layout of the computers and devices in a communications network.

ISDN lines, DSL, FTTP, T-carrier lines, and ATM

      5.      ISDN modem, DSL modem, Cable modem

ISDN modem sends digital data and information from a computer to an ISDN line and receives  digital data and information from ans ISDN line

DSL modem sends digital data and information from a computer to a DSL line and receives digital data and information from a DSL line.

Cable modem is a digital modem that sends and receives digital data over the cable television network.

The Answer of Chapter 8

True/false

1.   F

      2.   F
      3.   T
      4.   T
      5.   F
      6.   T
      7.   T
      8.   F
      9.   F
      10. T

Multiple Choices

 1. B
 2. B
 3. C
 4. A
 5. C
 6. D
 7. C
 8. A

Matching

 1.  F
 2.  C
 3.  G
 4.  D
 5.  E
 6.  H
 7.  A
 8.  B
 9.   I
 10. J

Short Answer

1. - When turning on a computer that has been powered off completely, you are performing a cold boot. A warm boot, by contrast, is the process of using the operating system to restart a computer.
   - The kernel is the core of an operating system that manages memory and devices, maintains the computer’s clock, starts programs, and assigns the computer’s resources, such as devices, programs, data, and information. The kernel is memory resident, which means it remains in memory while the computer is running. Other parts of the operating system are nonresident, that is, these instructions remain on a storage medium until they are needed.

2. - User interface controls how you enter data and instructions and how information is displayed on the screen.
   - graphical user interface (GUI), users interact with menus and visual images such as buttons and other graphical objects to issue commands. In a command-line interface, a user types commands or presses special keys on the keyboard (such as function keys or key combinations) to enter data and instructions.

3. -these updates can include fixes to program bugs, or errors, enhancements to security, modifications to device drivers, access to new or expanded components such as desktop themes or games, and even updates to application software on the computer such as a Web browser or an e-mail program.
  - a users who have registered and/or activated their software.

4. - During the back up process, the utility monitors progress and alerts you if it needs additional media, such as another disc. Many backup programs compress, or shrink the size of, files during the backup process. By compressing the files, the backup program requires less storage space for the backup files than for the original files.

   - restore utility reverses the process and returns backed up files to their original form.

5. - Windows Embedded CE,iPhone OS, Palm OS, Google Android.
   - a. Windows embedded CE use on communications, entertainment, and computing devices with limited functionality.
     b. iPhone OS to interact with iPhone OS devices using finger motions such as tapping a button on the screen, sliding your finger to drag an object, and pinching or unpinching your fingers to zoom in or out.
     c. Palm OS users can manage schedules and contacts, phone messages, notes, task and address lists, and appointments.
     d. Google Android allows programmers to design programs specifically for devices supporting this operating system.

The Answer of Chapter 7

True/ false

1.  T
2.  F
3.  F
4.  F
5.  F
6.  F
7.  F
8.  T
9.  F
10. T
11. F
12. F
13. F

Multiple Choice

1. B
2. C
3. D
4. D
5. A
6. C
7. B
8. B

Matching

1.  H
2.  C
3.  A
4.  E
5.  F
6.  J
7.  D
8.  B
9.  I
10. G

Short Answer

1. - Network attached storage is a server connected to a network with the sole purpose of providing storage.
   - With the introduction of smaller, less expensive NAS devices, however, some home and small business users opt to add up to 6 TB or more of hard disk storage space to their network with a NAS device.

2. - Advantages of SAS over parallel SCSI include thinner, longer cables; reduced interference; less expensive; support for many more connected devices at once; and faster speeds.
   - SAS interfaces usually are compatible with devices that have parallel SCSI and SATA interfaces.

3. - Single-session disc manufacturers write all items on the disc at one time. Multisession means you can write on part of the disc at one time and another part at a later time.
   - An archive disc stores photos from an online photo center in the jpg file format, usually at a maximum resolution of 7200 pixels per photo.Picture CDs stores digital versions of film using a jpg file format at a lower resolution, typically 1024 × 1536 pixels.

4. - Memory cards enable mobile users easily to transport digital photos, music, or files to and from mobile devices and computers or other devices.
   - CompactFlash (CF), Secure Digital (SD), Secure Digital High Capacity (SDHC), microSD, and micro SDHC.
a. CompactFlash (CF) used in Digital cameras, smart phones, PDAs, photo printers, portable media players, notebook computers, desktop computers.
b. Secure Digital(SD) used in Digital cameras, digital video cameras, smart phones, PDAs, photo printers, portable media players.
c. SDHC used in Digital cameras.
d. microSD used in Smart phones, portable media players, handheld game consoles, handheld navigation devices.
e.microSDHC used in Smart phones, portable media players, handheld game consoles, handheld navigation devices.

5. - Microfilm is a 100- to 215-foot roll of film. Microfiche is a small sheet of film, usually about 4x6 inches.
   - Some large organizations use microfilm and microfiche to archive inactive files. Some banks use them to store transactions and canceled checks. The U.S. Army uses them to store personnel records.

The Answer of Chapter 6

True/ false

1.  T
2.  T
3.  F
4.  T
5.  F
6.  F
7.  T
8.  F
9.  F
10. T
11. F
12. F
13. F

Multiple Choice

1. D
2. B
3. A
4. D
5. D
6. B
7. C
8. D

Matching

1.  D
2.  J
3.  G
4.  H
5.  F
6.  C
7.  A
8.  E
9.  B
10. I

Short Answer

1. - A higher resolution uses a greater number of pixels and thus provides a smoother, sharper, and clearer image. As you increase the resolution, however, some items on the screen appear smaller.
   - With LCD monitors and screens, resolution generally is proportional to the size of the device.

2. - via OTA it used a VHF/UHF antenna; via satellite, it used an HDTV-compatible satellite receiver/tuner; and via cable, you need an HDTV-compatible cable box.
   - Users plug one end of a cable in the game console and the other end in the video port on the television. Home users often prefer the larger television displays for game playing, watching movies, and browsing the Internet on a television connected to a game console.

3. - Bluetooth printing and Infrared printing.
   - Bluetooth printing, a computer or other device transmits output to a printer via radio waves. The computer or other device and the printer do not have to be aligned with each other; rather, they need to be within an approx i mate 30-foot range. With infrared printing, a printer communicates with a computer or other device using infrared light waves. To print from a smart phone, for example, a user lines up the IrDA port on the smart phone with the IrDA port on the printer.

4. - Ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper.
   - Professional applications requiring high image quality, such as photography studios, medical labs, and security identification systems, use dye-sublimation printers. These high-end printers cost thousands of dollars and print images in a wide range of sizes. Most dye-sublimation printers for the home or small business user, by contrast, typically print images in only one or two sizes and are much slower than their professional counterparts.

5. - A 2.1 speaker system contains two speakers and a subwoofer. A 5.1 speaker system has four satellite speakers, a center speaker, and a subwoofer. A 6.1 speaker system has four satellite speakers, a front center speaker, a rear center speaker, and a subwoofer. A 7.1 speaker system has four satellite speakers, two side speakers, a center speaker, and a subwoofer.
   - Audio resolution, which is the number of bytes that represent sound in a given time, is stated as a bit rate such as 8-bit, 16-bit, or 24-bit. The examples are 8-bit resolution, the sound quality is similar to an AM radio; 16-bit resolution yields optical disc-quality sound; and 24-bit resolution is used for high-quality digital audio editing.