Chapter 5

Discovering Computer 2011 Living in a Digital World Answers

Page 293-294

True / False

1.   True

2.   True

3.   False

4.   True

5.   False

6.   False

7.   False

8.   False

9.   False

10. True

11. True

12. True

Multiple Choice

1. C

2. A

3. B

4. C

5. D

6. C

7. C

8. C

Matching

1.   b

2.   g

3.   d

4.    j

5.   e

6.   a

7.   h

8.   f

9.   i

10. c

Short Answer

1. What are three different types of mouse devices?

Three different types of mouse devices are mechanical, opt. mechanical, and optical.

- What makes them different from each other?

Mechanical: Has a rubber or metal ball on its underside that can roll in all directions. Mechanical sensors within the mouse detect the direction the ball is rolling and move the screen pointer accordingly.

Opt. mechanical: Same as a mechanical mouse, but uses optical sensors to detect motion of the ball.

Optical: Uses a laser to detect the mouse's movement. You must move the mouse along a special mat with a grid so that the optical mechanism has a frame of reference. Optical mice have no mechanical moving parts. They respond more quickly and precisely than mechanical and optomechanical mice, but they are also more expensive.

2. Name at least five mouse operations.

Single-click, Double-click, Triple-click, Drag, right click

- Describe and give examples of each of the mouse operations

that you chose.

Single-click: clicking the main button.

Ex: The user click left / right mouse button to any object on desktop.

Double-click: clicking the button two times in quick succession counts as a different gesture than two separate single clicks.

Ex : When you want to open an application, you do double click on the icon of that application.

Triple-click: clicking the button three times in quick succession.

Ex: If you want to block all words in one sentence, try to do triple click.

Drag: pressing and holding a button, then moving the mouse without releasing.

Ex: Block a paragraph by holding the right click and moving the mouse without releasing (drag)

Right-click: clicking the secondary button.

Ex: You do this when you want to see the optional features of any application (properties).

3. What is OCR (optical character recognition)?

Optical Character Recognition (OCR) is a technology that involves reading typewritten, computer printed, or hand-printed characters from ordinary documents and translating the images into a form that the computer can process.

- What is OMR (optical character recognition)?

Optical Mark Recognition (OMR) is a technology that reads hand-drawn marks such as small circles or rectangles.

4. What is the most widely used biometric device today?

The most widely used biometric device today is fingerprint reader.

- Describe how the device works.

A fingerprint reader, captures curves and indentations ofa fingerprint to identify whether the ‘inputted’ fingerprint are the right one.

5. What is the Americans with Disabilities Act (ADA)?

 Americans with Disabilities Act are rules for company with 15 or more employees to make a reasonable attempt to accommodate the need of physically challenged workers.

- How might gesture recognition and computerized implant devices help physically challenged users in the future?
Gesture recognition and Computerized implant devices are a way for human to provide a natural computer interface for the physically challenged people through a means of just moving a small part of the body that are still functioning.