OCR COMPUTER SCIENCE A LEVEL PAPER 1 TRIAL EXAM

OCR COMPUTER SCIENCE A LEVEL PAPER 1 TRIAL EXAM Embedded System - CORRECT ANSWERS-A computer system that forms part of an electronic device Kernel - CORRECT ANSWERS-The lowest level of an operating system that controls the hardware HTML - CORRECT ANSWERS-Hypertext mark up language - a text based system for defining web pages PDF - CORRECT ANSWERS-Portable document format - a file standard that displays a document accuratley on any computer platform Internation Organisation for Standardisation (ISO) - CORRECT ANSWERS-The world's largest standards developing organisation. It produces international standards for engineering,agriculture and medicine, as well as for information technology TCP/IP - CORRECT ANSWERS-Transmisson control protocol/internet protocol - a set of standards that control how data is sent across networks including the internet Computer Architecture - CORRECT ANSWERS-The internal, logical structure and organisation of the computer hardware Binary - CORRECT ANSWERS-A system of number using only two digits 0 and 1 (also called the base-2 system), unlike the decimal (or denary) system in everyday use that that uses ten (base-10) CPU - CORRECT ANSWERS-Central processing unit of the computer containing the control unit, ALU and cache memory Control Unit - CORRECT ANSWERS-The control unit works with CPU to control the flow of data within the system ALU - CORRECT ANSWERS-The ALU performs all the arithmetic and logical operations within the CPU Random Acess Memory (RAM0 - CORRECT ANSWERS-Main memory of computer that stores data,applications and the operating system while in use.When the power is turned off RAM loses it's data Cache Memory - CORRECT ANSWERS-Special high speed memory used by a computer Flash Memory - CORRECT ANSWERS-Solid-state memory used as low cost secondary storage in portable devices and as removable memory Solid State - CORRECT ANSWERS-Technology based on electronics with no moving parts, for example transistors and capicatators as used in memory chips Secondary Storage - CORRECT ANSWERS-Non-volatile storage used to store programs and files that need to be kept even when the power is not on Fetch-execute cycle - CORRECT ANSWERS-This is the process of fetching the instruction from memory, decoding them and then executing them so that the CPU performs continuously Read Only Memory (ROM) - CORRECT ANSWERS-A store for data in a computer that cannot be overwritten. Data in ROM is always avaliable and is not lost when the computer is turned off Clock Chip - CORRECT ANSWERS-The electronic device in a computer that controls the timing of signals Bus - CORRECT ANSWERS-A part of computer architecture that transfers data and signals between components of the computer Motherboard - CORRECT ANSWERS-The central printed circuit board (PCB) that holds the crucial components of the system Dual-core/Quad-Core - CORRECT ANSWERS-A CPU with multiple processors (a dualcore has two,a quad-core has four) Bit - CORRECT ANSWERS-Binary Digit 0 to 1 Byte - CORRECT ANSWERS-8 Bits Kilobyte - CORRECT ANSWERS-1024 Bytes Volatile - CORRECT ANSWERS-Data lost when there is no power Non-Volatile - CORRECT ANSWERS-Data rentained even when power turned off Virtual Memory - CORRECT ANSWERS-A section of hard disk used as if it were RAM to supplement the amount of main memory avaliable to the computer.Used when there is not enough main memory to run the programs required Logice Gate - CORRECT ANSWERS-A circuit that produces an output based on the inputs NOT: - CORRECT ANSWERS-A logic gate that outputs the opposite value to the input AND: - CORRECT ANSWERS-A logice gate that outputs 1 if both inputs are 1 OR: - CORRECT ANSWERS-A logic gate that outputs 1 if either,or both,of the two inputs are one Truth Table - CORRECT ANSWERS-A method for recording all the possible input combinations and determing the output for each Logic Circuit - CORRECT ANSWERS-A circuit made by combining a sequence of logic gates Boolean Algebra - CORRECT ANSWERS-A method for expressing mathematically a logic circuit Input Device - CORRECT ANSWERS-A hardware device used to input data into a computer system for processing Keyboard - CORRECT ANSWERS-A device that uses labelled keys to enable data input into a computer Mouse - CORRECT ANSWERS-A device that controls the movement of a pointed on screen,based on it's own movement, and allows the user to select an object by pressing a button Touch Screen - CORRECT ANSWERS-A touch sensitive surface that allows the user to select,control or move objects by touching icons and symbols using fingers Microphone - CORRECT ANSWERS-A device for capturing sound Camera - CORRECT ANSWERS-A deice to capture still or moving images Bar Code - CORRECT ANSWERS-A pattern of thin and thick lines representing a number that can be scanned by a reader for input into a computer system RFID - CORRECT ANSWERS-Radio Frequency identification used radio frequencies to represent a number that can be scanned for input into a computer system Sensor - CORRECT ANSWERS-A device that can detect physical conditions such as temperature,weight,light and sound Monitor - CORRECT ANSWERS-A device that can display images and text Printer - CORRECT ANSWERS-A device to produce physical copies of output from