Comp OCR GCSE

• What is the purpose of the CPU?


  Input, process output
• What is the purpose of RAM?

  Stores data/instructions temporarily
• What is the purpose of HDD?

  Stores permanent data and files.
• NOT operator


  Inversion (false is true, true is false)
• AND operator


  Conjunction ( both activators must be true for it to be true)
• OR operator


  Disjunction ( At least one must be true)
• % remainder division
• Why does data need to be converted into binary?

  Computers use electronic signals that are two states. All data must be converted into binary.
• Operating systems


  A set of programs that controls the operation of a computer system
• What does the operating system do?

  manages all the software and hardware
• Example of Operating systems


  Android, IOS, Microsoft Windows
• Open source software


  Software with source code that anyone can inspect, modify and enhance
• General Purpose Computing System

  A computing system designed to automate any process, as specified by a program
• Resolution


  The measure of the number of pixels in an image
• What is a processor?


  fetches, decodes and executes program instructions
• What is the difference between storage and memory?

  Storage does not get deleted after turned off, memory does
• // Integer division (returns back the integer)
• To the power of (22 = 2^2)
• What is logic?


  Binary that describes the functions of hardware components
• What is syntax?


  The grammar of a programming language
• What is a logical error?


  When your program doesn't work the way it should
• Syntax error


  A mistake in the programs grammar
• Sequence


  A set of step by step instructions
• Selection


  The choice through a computer program
• Iteration


  Repetition of a process to create a more efficient solution
• Algorithm


  A set of step by step instructions used to complete a task
• Metadata


  Data about data
• Colour depth


  the number of bits used for each pixel in an image file
• How do you calculate the file size of an image?

  Resolution * colour depth
• How does resolution and colour depth effect file size and quality of an image

  As the bit depth increases, the file size does however the quality gets better
• what is a Trojan?


  A piece of software that appears to perform a useful function but actually performs malicious actions without the user knowing
• Spyware


  unwanted software that monitors information on a person and how they use their computers
• Adware


  Infects a computer and causes it Ito download or display malicious adverts/pop-ups when the victim is online
• Bots


  Automated programs that perform tasks repeatedly
• Virus


  Malicious form of self replicating software
• Botnet


  A large collection of malware infected devices (zombies)
• Worms


  Self replicating like viruses but do not attach themselves to files as viruses do
• Hacking


  Gaining unauthorised access or control of a computer system
• Social engineering


  A set of methods used by cyber criminals to deceive individuals into handing over info
• volatile


  data that will be lost when the computer or device is off