iGCSE Computer Science – Paper 1
Unlock all answers in this set
Unlock answersquestion
an interface
answer
two computer systems are able to communicate with each other using
question
embedded system
answer
system part of a larger mechanical or electrical system
question
dedicated system
answer
system only has one specific task to do
question
general purpose system
answer
system used for many purposes such as web browsing or games
question
VoIP
answer
Voice over Internet Protocol
question
Skype
answer
Example of a VoIP
question
alpha testing
answer
errors in software identified and removed inside an organisation
question
beta testing
answer
errors in software identified and removed outside an organisation
question
proprietary standard
answer
created and owned by a company, widely used, unofficial standard
question
International Organisation for Standardisation
answer
ISO
question
Microsoft Word document format
answer
Example of a proprietary standard
question
industry standard
answer
technical standards used to specify hardware and software
question
SATA and USB
answer
examples of industry standards
question
de facto standard
answer
not approved officially, may be proprietary, most users use them
question
QWERTY keyboard, .doc format
answer
examples of de facto standards
question
open standard
answer
publically available, use at no cost
question
HTML
answer
example of an open standard
question
a bit
answer
a binary digit is referred to as
question
a byte
answer
8 bits
question
2^10
answer
bits in a kilobyte
question
2^20
answer
bits in a megabyte
question
2^30
answer
bits in a gigabyte
question
2^40
answer
bits in a terabyte
question
2^50
answer
bits in a petrabyte
question
1024
answer
bytes in a kilobyte
question
memory dump
answer
when memory contents are output to a printer or monitor
question
in the processing, definition and presentation of text
answer
a mark-up language is used
question
Media Access Control
answer
what does MAC stand for
question
MAC address
answer
refers to a number which uniquely identifies a device on the internet
question
Network Interface Card
answer
what does NIC stand for
question
rarely
answer
the MAC address is ------ changed
question
Universally Administered mac Address
answer
what does UAA stand for
question
Locally Administered mac Address
answer
what does LAA stand for
question
American Standard Code for Information Interchange
answer
what does ASCII stand for
question
hexadecimal is being used
answer
what is the % sign used to denote
question
simplex data transmission
answer
transmission in one direction only
question
half-duplex data transmission
answer
transmission in both directions but not at the same time
question
full-duplex data transmission
answer
transmission in both directions simultaneously
question
serial data transmission
answer
data sent one bit at a time over a single wire or channel
question
parallel data transmission
answer
several bits of data are sent down several wires or channels simultaneously. one wire is used to transfer each bit
question
5 functions of an operating system
answer
1. Managing files 2. Managing user accounts 3.Controlling input and output devices 4. Error handling 5. Loading/running software and applications
question
interrupt signal
answer
signal sent from a device/software, causes temporary stop in action eg. paper jam in a printer sends an interrupt signal
question
buffers
answer
temporary memory areas in computers, allow the processor to continue on other tasks while the buffer holds data
question
von Neumann architecture
answer
the idea of holding programs and data in the memory of a computer
question
computed tomographic (CT) scanners
answer
used to create a 3D image of a solid object, using lots of 2D \"slices\"
question
4 advantages of using barcodes
answer
1. faster checkout queues 2. easier and faster to change prices on items 3. errors in charging customers are reduced 4. better, up-to-date sales information
question
asynchronous data transmission
answer
data being transmitted in an agreed bit pattern and sent with a control bit at each end in discrete groups
question
use parity blocks
answer
how to parity check in a way that reveals the location of the error
question
Automatic Repeat reQuest
answer
what does ARQ stand for
question
to separate incoming groups of data
answer
what are control bits used to do
question
synchronous data transmission
answer
a continuous stream of data accompanied by internally generated timing signals
question
parallel data transmission
answer
what type of transmission is used internally in a computer system
