42.Screen brightness can be measured as . ( )
A. contrast ratio
B. either a. or b.
C. luminance
D. neither a. nor b.
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22. software helps computers manage files, interact with peripheral devices, send data over networks, and filter out viruses. ( )
A. Database
B. Application
C. Productivity
D. System
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146.A_typically connects personal computers within a very limited geographical area, usually within single building.
A. BAN
B. LAN:local area network
C. WAN wide area network
D. NAN
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40.The mouse is the most important input device on desktop and notebook computers.
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2.Digital audio is music, speech, and other sounds represented in format for use in digital devices. ( )
A. analog
B. both a. and b.
C. neither a. nor b.
D. binary
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24.The primary purpose of software—your computer’s operating system, device drivers, and utilities—is to help the computer carry out its basic operating function. ( )
A. database
B. productivity
C. system
D. application
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127. A proprietary version of MP3,designated as ,is used for iTunes music.( )
A. MP4
B. M4P
C. PM4
D. P4M
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18.Most database software includes tools to create all of these EXCEPT . ( )
A. electronic forms
B. insight lists
C. queries
D. reports
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132. software is designed to help you create,
manipulate,and print graphics.
A. Video
B. Graphics
C. Camera
D. Presentation
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36.True LED screens have a bright,crisp image and use less power that LCDs.
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