Hardware devices that are not part of the main computer system and are often added later to the system.
Answer: A
Devices outside the main computer, often added later, are peripherals.
They divide into input devices such as the keyboard and scanner, output devices such as the monitor and printer, and storage devices such as external drives.
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Computers calculate numbers in what mode?
Answer: C
Computers calculate in binary.
A transistor is either conducting or not, so two states are natural and reliable; ten voltage levels would be far harder to distinguish. All arithmetic is done in base two and converted to decimal only for display.
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How many terminals does a BJT have?
Answer: D
A BJT has three terminals.
They are the emitter, base and collector. A small base current controls a much larger collector current, and the ratio of the two is the transistor's current gain.
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A JPG is:
Answer: B
A JPG is a format for an image file.
JPEG compresses photographs by discarding the fine detail the eye notices least, achieving ten- or twentyfold reduction. Because the loss is cumulative, an image should be edited in a lossless format and saved as JPEG only at the end.
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Which of the following is not a programming language?
Answer: C
Ethernet is not a programming language - it is a family of networking standards for local area networks.
BASIC, Java and C# are all programming languages. Ethernet defines how data is framed and how machines share the wire.
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The "desktop" of a computer refers to:
Answer: A
The desktop is the visible screen a computer shows when it starts.
It is the metaphor at the base of the graphical interface: icons standing for files and programs laid out on a surface, as papers on a desk. Xerox PARC introduced it and the Apple Macintosh made it familiar.
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Which company created the most used networking software in the 1980's
Answer: D
Novell created the most widely used networking software of the 1980s.
NetWare let PCs share files and printers over a local network, and dominated the market until Microsoft built networking into Windows NT in the 1990s.
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HTML is used to
Answer: B
HTML is used to author web pages.
HyperText Markup Language marks up text with tags that describe its structure - headings, paragraphs, lists, links - which the browser then renders. Tim Berners-Lee devised it in 1990.
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To select text by shading as you drag the mouse arrow over the text is known as...
Answer: B
Shading text by dragging the mouse over it is highlighting, or selecting.
The selected text becomes the target of the next command - copy, delete, change font - which is the select-then-act principle the graphical interface is built on.
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Where are the contents of your computer's hard drive indexed?
Answer: D
None of the above - the contents of your hard drive are indexed by the operating system, on your own machine.
Windows Search, Spotlight and similar tools build a local index. Yahoo, Google and MSN index the public web and can see nothing on a private computer.
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