Chapter 6

Discovering Computers 2011 : Living in a Digital World Answers

True/False

1.   True
2.   True
3.   False
4.   True
5.   False
6.   False
7.   True
8.   False
9.   False
10. True
11. False
12. False
13. False

Multiple Choice

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

Matching

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

Short Answer

1. Resolution affect images displayed on a monitor by having a   higher resolution, it 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.

Resolution relate to the size of an LCD monitor or screen because resolution is the number of horizontal and vertical pixels in a display device. For example, a monitor that has a 1440 X 900 resolution displays up to 1440 pixels per horizontal row and 900 pixels per vertical row, for a total of 1,296,000 pixels to create a screen image.

2. Some of the features of HDTV are it works with digital broadcast signals, transmitting digital sound, supporting wide screens, and providing resolutions up to 1920 X 1080 pixels.

Game console users set up the output for the consoles by pluging one end of a cable in the game console and the other end in the video port on the television.

3. The two types of wireless printing technology are Bluetooth printing and infrared printing .

With 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. An ink-jet printer works by forming 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. These lower-end dye-sublimation printers are comparable in cost to a photoprinter based on ink-jet technology. Some are small enough for the mobile user to carry the printer in a briefcase.

5. Most surround sound computer speaker systems include one or two center speakers and two or more satellite speakers that are positioned so that sound emits from all directions.

Audio resolution 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. An 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.