Week 2 RevisionGrade 10 Computer Science

Objectives: Standard Input & Output devices Considering Computer Performance Factors Data backup Protecting Computers from power loss and fluctuation Printer Problems Inoperable hardware devices Identifying maintenance management issues: Cable management Disk Defragmentation Requesting specialized maintenance

Multiple ChoiceIdentify the choice that best completes the statement or answers the question.

Saeed is looking to buy a new computer, and is researching input devices.

____ 1. Saeed learns that a(n) ____ mouse uses infrared waves to communicate with the

computer.

a. optical c. radio frequency

b. optomechanical d. wireless

____ 2. Saeed learns that ____ a mouse can be used to highlight a selected portion of text.

a. dragging c. right-clicking

b. pointing d. clicking

Sara is a computer professional with lots of knowledge about computer maintenance.

____ 3. Sara tells her clients that all of the following should be performed by a computer

professional EXCEPT: ____.

a. replacing the processor c. adding RAM

b. opening the power supply case d. installing a cable management kit

____ 4. Sara tells her clients that all of the following is true about computer maintenance

EXCEPT: ____.

a. cleaning mechanical mice can eliminate jerky or erratic movement of the mouse

pointer

b. many inkjet printers have a self-cleaning mode

c. replacing a keyboard involves replacing many complicated hardware components

d. exposure to light can damage toner cartridges

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CompletionComplete each statement.

Output pointing touchpad Bluetoothsectors Surge spikes

1. A(n) _______ pointing _____________ device is an input device you use to select

objects and click buttons.

2. A(n) ________ touchpad____________ is a common pointing device for laptops with

a specialized surface that can convert the motion of your fingers to a position on the

screen.

3. _____ Output ______ is data processed into a useful format.

4. _________ Bluetooth ____ uses radio waves and provides wireless short-range

communications of data and voice between mobile and stationary devices.

5. ________ Surge ____________ suppressors plug into electric outlets and can protect

against power spikes.

6. A power ________Spikes____________ is a short, fast transfer of electrical voltage,

current, or energy that can damage computer hardware and software.

7. As drive space becomes limited, Windows divides data from new files into

_________Sectors___________.

Matching

Identify the letter of the choice that best matches the phrase or definition. a. Rotatingb. Tiltingc. CRTd. LCDe. Gas plasma

__b__ 1. Moving the mouse wheel right or left to scroll horizontally

__E__ 2. Monitor type that has brilliant color display and is available in sizes up to 60 inches or more.

__A__ 3. Moving the mouse wheel forward or backward to scroll vertically

__D__ 4. Monitor type originally used on notebook computers and mobile devices

__C__ 5. Monitor type similar to older models of TVs

True/False

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Indicate whether the statement is true or false.

_T___ 1. The NIK keyboard is flexible, can be rolled up and put into a briefcase, and even washed with soap and water or a spray cleaner.

__T__ 2. A laser virtual keyboard easily connects to any PC or smart phone.

__F__ 3. The most common type of pointing device for PCs is the keyboard.

__F__ 4. CRT panels produce an image by manipulating light within a layer of liquid crystal cells.

__F__ 5. Print quality is measured in ppm.

__F__ 6. The amount of ROM helps to speed up the processing cycle and to enhance the computer’s performance.

__T__7. The higher the CPU generation, the faster and better the processing speed.

__T__8. To improve computer performance dramatically, increase the amount of RAM on your computer.

__T__ 9. Do not plug a laser printer into a UPS.

__T__10. A UPS contains a battery that temporarily provides power if the normal current is interrupted.

___F_11. When eliminating a paper jam, always pull the paper in the opposite direction of the paper path.

__T__12. Damaged and poorly maintained cables can prevent peripheral devices from communicating with the computer.

__F__13. Cable management kits are available only through computing professionals.

__T__14. When a computer is new, the operating system writes data in side-by-side clusters.

Modified True/FalseIndicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.

__T__ 1. The trackball is a pointing device that works like a mouse turned upside down. ____________________

__F__ 2. Examples of video input devices are microphones and CD/DVD players. __________ audio __________

_T___ 3. A(n) laser printer produces images using the same technology as copier machines. ____________________

__F__ 4. A(n) pointing stick and digital pen are pen-like writing instruments you use to enter information by writing on a screen on a mobile device. _______ stylus ________

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__T__ 5. UPS stands for Uninterruptible power supply.

Multiple ChoiceIdentify the choice that best completes the statement or answers the question.

____ 1. Which of the following is NOT a type of keyboard?a. ergonomic c. opticalb. wireless d. security

____ 2. Sensors inside a(n) ____ mouse determine the direction and distance of the movement.a. mechanical c. wirelessb. optical d. trackball

____ 3. A(n) ____ mouse uses a laser to detect the mouse’s movement.a. mechanical c. wirelessb. optical d. trackball

____ 4. Which of the following is NOT true about mice?a. Most mice have two or three buttons.b. Generally, clicking the right mouse button displays a shortcut menu.c. Double-clicking selects a paragraph of text.d. You use the left mouse button for most operations.

____ 5. A(n) ____ is a pressure-sensitive pointing device on a notebook computer that looks like a pencil eraser.a. touchpoint c. trackballb. touchpad d. pointing stick

____ 6. Which of the following is NOT true about monitors?a. They are a display device typical of desktop computers.b. Screen output is called hard copy.c. The CRT was one of the earliest types of computer monitors.d. LCD and gas plasma are types of flat-panel monitors.

____ 7. Laser printers and inkjet printers are examples of ____ printers.a. nonimpact c. obsoleteb. impact d. specialized

____ 8. Which of the following types of keyboards is designed to provide users with a more natural and comfortable hand, wrist, and arm position?a. security c. ergonomicb. cordless d. wireless

____ 9. ____ procedures should place a priority on files that would be difficult or impossible to replace or reconstruct if they were lost.a. Backup c. Encryptionb. Security d. Recovery

____ 10. Which of the following is NOT true about data backup?a. Backup disks enable you to restore

data.c. Large organizations have secure

backup procedures that include a

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regular schedule for backing up files.b. You should back up data to your hard

drive.d. Data backup systems includes tape

devices.

____ 11. The above figure is an example of a(n) ____.a. surge suppressor c. SPSb. UPS d. power strip

____ 12. SPS stands for ____ Power System.a. Sustainable c. Standbyb. Special d. Serial

____ 13. If the printed image is faded, it could be because of all of the following conditions EXCEPT: ____.a. the printer’s fuser assembly might be

damagedc. the print density is set too low

b. the toner is low d. economy mode printing is turned on

____ 14. Disk ____ occurs when data is broken up into many pieces that are not stored close together.a. fragmentation c. sectoringb. defragmentation d. seek time

DefinitionDefine each of the following terms

Audio input: Sound entered into a computer, including speech, sound effects, and music.

Biometrics: An authentication technique using automated methods of recognizing a person based on a physiological or behavioral characteristic.

Expansion slot: Openings on the motherboard where an expansion board can be inserted.

Inkjet printer: Provides good-quality color printing for less expense than a laser printer.

Input: Data or instructions entered into a computer. Keyboard: The most commonly used input device for entering text and numbers

into a computer. Laser printer: Produces images using the same technology as copier machines. Modem: A device that allows one computer to talk to another. Monitor: Display device for a computer. Mouse: The most common pointing device for personal computers.

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Output: Data processed into a useful format. Pointing device: An input device you use to position the pointer on the screen. Port: An interface to which a peripheral device attaches to or communicates with

the system unit or other peripheral devices. Also called a jack. Printer: Produces a paper copy, or hard copy, or processing results. Trackball: A pointing device that works like a mouse turned upside down; the

ball is on top of the device.

Short AnswersAnswer the following questions

1. What is the function of each a. Input devices: Enables you to enter data and commands into the

computer b. Output devices: Enables the computer to give you the results of the

processed data.

2. What are differences between laser printers and inkjet printers?Answer: Laser printers use laser to produce very high quality image while inkjet printers use nozzles squirt ink as they pass over the media.

3. Explain why beginners can’t replace RAM, hard disk and video cards ? Answer: Because this process requires a professional who has enough knowledge with computer parts.

4. List three different types of keyboards? And identify their functions:a. Ergonomic keyboard: lets you use more natural and comfortable hand,

wrist, and arm positions.b. Wireless keyboard: a battery powered keyboard that transmits data

using wireless technology.c. Security keyboard: provides security features such as biometric

fingerprints reader, magnetic stripe, and smart card reader.

5. What is software piracy? It is the unauthorized copying of software.

6. What is the difference between optical mouse and wireless mouse:

Answer: Optical mouse uses a laser to detect the mouse’s movement. Wireless mouse is a battery powered device that relies on infrared waves to communicate with the computer.

7. List internal hardware maintenance or repair that generally should be performed by a computer professional.1. Replacing the power supply or opening the power supply case2. Replacing other electrical components3. Replacing the processor4. Replacing or adding a hard disk5. Replacing or adding additional RAM

8. What is Disk fragmentation?

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Occurs when data is broken up into many pieces that are not stored close together. The sectors are stored in blocks of nonadjacent clusters, thus creating fragmented files.

9. Why ink or toner comes off the paper when touched?a. The printer’s fuser assembly might be damaged and need to be

replacedb. The toner cartridge could be defective and need to be replacedc. Some toner may have spilled into the printer

10. Why could be the printer image be faded?a. Toner is lowb. The print density is set too lowc. Economy mode printing is turned on.

11. Why paper jam can happen?a. Using the wrong type of paperb. Using wrinkled or torn paperc. Printer rollers that feed the paper are worn or dirty.

12. Explain why we should not plug a laser printer into a UPS?Laser printers need a lot of power when they start a print job, and can damage a UPS or even components connected to it.

13. List the devices that affect computer performance?a. Microprocessor: the faster the processor, the more instructions per

second it can process.b. Random Access Memory: To improve computer performance, increase

the amount of RAM on your computer.c. Hard Disk: the bigger and faster the hard disk, the faster it can process

data.d. Video: having better video memory for the video card allows the

processor to perform its full potential.

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