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Exam (elaborations)

Exam (elaborations) AQA AS Computer Science - Paper 2

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ENTAILS QUESTIONS AND ANSWERS

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, Application software - CORRECT ANSWERS-Software which helps the user complete
specific tasks - for example word processing.

Basic Input Output System (BIOS) - CORRECT ANSWERS-Where important
instructions explaining how to turn on the computer are stored - for example, how to find
a keyboard and interpret keystrokes.

Bit - CORRECT ANSWERS-A binary 1 or 0. Normally part of a byte.

Bitrate - CORRECT ANSWERS-The amount of data (measured in bits) that can be
transmitted per second. Can also be called the baud rate.

Byte - CORRECT ANSWERS-A group of bits (usually 8) treated as one unit.

Checksum - CORRECT ANSWERS-An extra byte that is added to a block of data,
which is the sum of the bits, ignoring any carry. This is then calculated by the receiver,
and if they match, then the data is accepted.

Ethernet - CORRECT ANSWERS-A cable standard used to connect nodes within a
LAN.

Graphical User Interface (GUI) - CORRECT ANSWERS-An intuitive interface using
images to represent commands. It is easy for beginners to use, however it can be slow
as many commands are hidden so the user is not confused.

Hardware - CORRECT ANSWERS-The physical components which make up the
computer.

Input Device - CORRECT ANSWERS-A type of peripheral that can accept data, decode
it, and send it as electrical pulses to the computer. For example: keyboards, mice,
digital cameras, and microphones.

I/O Device - CORRECT ANSWERS-A device that communicates between the computer
and the outside word - for example a keyboard or a printer. Sometimes also known as
an HID (Human Interface Device).

Local Area Network (LAN) - CORRECT ANSWERS-Computers connected to each
other in a geographically small area, for example a home network.

Magnetic Ink Character Reader (MICR) - CORRECT ANSWERS-Reads characters
which have been printed using special magnetic ink. The only common use is the
account information printed on the bottom of cheques. Unlike bar codes, can easily be
read by both humans and computers.

Network - CORRECT ANSWERS-2 or more computing devices connected together so
that they can share data and resources.

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