Exam (elaborations)
CIE A Level CS 9608.
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CIE A Level CS 9608.
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CIE A Level CS 9608bit - correct answer-binary digit
Binary - correct answer-Base-2 counting system
Hexadecimal - correct answer-Base-16 counting system
Nibble - correct answer-4 bits
BCD - correct answer-Binary Coded Decimal
BCD Used in...? - correct answer-Calculator, cash register, time displays
ASCII - correct answer-American Standard Code for Information Interchange
7-bits - correct answer-Number of bits to encode a character in ASCII
Unicode - correct answer-Successor to ASCII allowing for all characters to be represented.
Drawing list - correct answer-Part of the vector graphic file that details each object in the
image
Pixel - correct answer-Picture element
Pixel definition - correct answer-Smallest element of a bitmap image.
Bit depth - correct answer-Number of bits per pixel
Colour depth - correct answer-Another name for bit depth
Header - correct answer-Extra data in a bitmap file for storing meta data
Kibi - correct answer-2^10
Mibi - correct answer-2^20
Gibi - correct answer-2^30
Band filter - correct answer-Device that removes high frequency sounds that the human ear
cannot hear
Sampling resolution - correct answer-Number of bits per sample
16 bits - correct answer-Most common sampling resolution gives good trade-off between file
size and quality
,Quantisation error - correct answer-Error due to encoding analogue signal into limited
number of possible digital values
Sampling rate - correct answer-Number of samples per second
Nyquists theorem - correct answer-Sampling rate must be at least twice the highest
frequency in the sample.
Interlaced encoding - correct answer-Odd and even lines on the screen are refreshed
alternately to give the impression of a high refresh rate with reduced bandwidth
Progressive encoding - correct answer-The entire frame is refreshed each time.
Run-length encoding - correct answer-Compression that converts sequences of the same
value into a single value and a count of the number of repeats.
Spatial compression - correct answer-Each frame of a video file is compressed using the
same techniques as for images.
Temporal compression - correct answer-Analysing successive frames and only storing the
differences.
Multimedia container - correct answer-File type containing both video and audio data also
subtitles etc.
FLAC - correct answer-Free Lossless Audio Codec
JPEG - correct answer-Lossily compressed image format
MP3 - correct answer-Lossily compressed audio format
Data verification - correct answer-Checks that inputted data matches the original data source
Data validation - correct answer-Checking that the data that has been entered is reasonable
Parity bit - correct answer-Bit used to check whether data is transmitted correctly.
Parity byte - correct answer-Byte transmitted to check a block of bytes has been transmitted
correctly
Firewall - correct answer-System that controls the flow of data between computer systems.
Packet filtering - correct answer-Each packet entering or leaving the system is examined and
accepted or rejected based on rules.
Access rights - correct answer-The permission users have in a computer system
, Range check - correct answer-Validation to see if the data is within the allowed range.
Biometric authentication - correct answer-Using measurements of peoples physical
characteristics to prove they are who they claim to be.
Check digit - correct answer-Digit calculated from the digits in the value and added onto the
end used to detect data entry errors.
Check sum - correct answer-Calculated from the data and used to check that data has been
transmitted correctly.
CLI - correct answer-Command Line Interface
GUI - correct answer-Graphical User Interface
R... management (OS Job) - correct answer-Resource management
F... management (OS job) - correct answer-File management
S... management (OS job) - correct answer-Security management
D... management (OS job) - correct answer-Device management
Disk formatter - correct answer-Utility software to wipe the disk and set-up the file system
Disk defragmenter - correct answer-Utility software that rearranges the location of pieces of
files so that they are together on the disk.
Back-up software - correct answer-Utility software that regularly copies data to a separate
medium
Library program - correct answer-Pre-written code that programmers can use in their
programs.
Compiler - correct answer-Translates a high-level language into object code
Interpreter - correct answer-Translates a high-level language one line at a time and executes
each line.
Which translator for developing a program in a high-level language? - correct
answer-Interpreter
Which translator for creating an executable program to sell to customer. - correct
answer-Compiler
Which translator produces an error report at the end of the translation process? - correct
answer-Compiler
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