iGCSE COMPUTER SCIENCE 0478
EXAM REVIEW QUESTIONS WITH
CORRECT ANSWERS
Character - Answer-Text, numbers and symbols, for example each key on a keyboard.
Algorithm - Answer-Step by step set of instructions.
Data - Answer-numbers, symbols or alphanumeric characters in their raw format before
processing
Analogue - Answer-this is the smooth stream of data that our senses process on a daily
basis, such as a sound wave
Digital - Answer-data represented in the values 1 and 0 that a computer can process
Denary - Answer-a system of numbers with a base of 10. Each unit used increases by
the power of 10
Binary - Answer-a system of numbers with a base of 2. Each unit increases by the
power of 12
Register - Answer-small pieces of memory where values can be held
Hexadecimal - Answer-a system of numbers with a base of 16. Each unit used
increases by the power of 16
Debug - Answer-finding and fixing problems and errors in a program
Character - Answer-text, numbers and symbols, for example each key on a keyboard
Algorithm - Answer-a step-by-step set of instructions
Bit - Answer-short for binary digit, it is the smallest unit of data in a computer
Bit rate - Answer-the rate at which data is transferred
Serial transmission - Answer-uses a single wire to transfer bits of data
Parallel transmission - Answer-uses multiple wires to transfer bits of data
Interference - Answer-disturbances that can occur in the signals when sending data that
may corrupt it
, Simplex transmission - Answer-sending data in one direction only at a time
Duplex transmission - Answer-sending data in both directions at the same time
Half- duplex transmission - Answer-sending data in both directions but only one
direction at a time
Hacker - Answer-a person who tries to gain unauthorized access to a computer on
network
Malware - Answer-a software program that is designed to damage or disrupt a computer
Virus - Answer-a software program that is designed to corrupt a computer and the files
on it
Spyware - Answer-a software program that collects users information through their
Internet connection
Hacking - Answer-gaining unauthorized access to a computer or network
Firewall - Answer-a system that protects unauthorized access to or from a computer or
network
Modem - Answer-a hardware device that converts data so that it can be transmitted
from computer to computer over telephone wires
Browser - Answer-a program used to access the World Wide Web that displays HTML
files
Packet - Answer-a unit of data that can be sent across a network
Protocol - Answer-an agreed format or set of rules to transmit data
Cache memory - Answer-a portion of memory used for high- speed storage
Register - Answer-an internal memory location within the CPU that temporarily holds
data and instructions during processing
Accumulator - Answer-the register that is used for arithmetic and logic calculations
Peripheral - Answer-a hardware device, used to input, store or output data from a
computer, that is not directly part of a computer itself
High-level language - Answer-a programming language that looks like the language
humans generally use
EXAM REVIEW QUESTIONS WITH
CORRECT ANSWERS
Character - Answer-Text, numbers and symbols, for example each key on a keyboard.
Algorithm - Answer-Step by step set of instructions.
Data - Answer-numbers, symbols or alphanumeric characters in their raw format before
processing
Analogue - Answer-this is the smooth stream of data that our senses process on a daily
basis, such as a sound wave
Digital - Answer-data represented in the values 1 and 0 that a computer can process
Denary - Answer-a system of numbers with a base of 10. Each unit used increases by
the power of 10
Binary - Answer-a system of numbers with a base of 2. Each unit increases by the
power of 12
Register - Answer-small pieces of memory where values can be held
Hexadecimal - Answer-a system of numbers with a base of 16. Each unit used
increases by the power of 16
Debug - Answer-finding and fixing problems and errors in a program
Character - Answer-text, numbers and symbols, for example each key on a keyboard
Algorithm - Answer-a step-by-step set of instructions
Bit - Answer-short for binary digit, it is the smallest unit of data in a computer
Bit rate - Answer-the rate at which data is transferred
Serial transmission - Answer-uses a single wire to transfer bits of data
Parallel transmission - Answer-uses multiple wires to transfer bits of data
Interference - Answer-disturbances that can occur in the signals when sending data that
may corrupt it
, Simplex transmission - Answer-sending data in one direction only at a time
Duplex transmission - Answer-sending data in both directions at the same time
Half- duplex transmission - Answer-sending data in both directions but only one
direction at a time
Hacker - Answer-a person who tries to gain unauthorized access to a computer on
network
Malware - Answer-a software program that is designed to damage or disrupt a computer
Virus - Answer-a software program that is designed to corrupt a computer and the files
on it
Spyware - Answer-a software program that collects users information through their
Internet connection
Hacking - Answer-gaining unauthorized access to a computer or network
Firewall - Answer-a system that protects unauthorized access to or from a computer or
network
Modem - Answer-a hardware device that converts data so that it can be transmitted
from computer to computer over telephone wires
Browser - Answer-a program used to access the World Wide Web that displays HTML
files
Packet - Answer-a unit of data that can be sent across a network
Protocol - Answer-an agreed format or set of rules to transmit data
Cache memory - Answer-a portion of memory used for high- speed storage
Register - Answer-an internal memory location within the CPU that temporarily holds
data and instructions during processing
Accumulator - Answer-the register that is used for arithmetic and logic calculations
Peripheral - Answer-a hardware device, used to input, store or output data from a
computer, that is not directly part of a computer itself
High-level language - Answer-a programming language that looks like the language
humans generally use
