AQA A LEVEL COMPUTER SCIENCE Study guides, Class notes & Summaries

AQA A-LEVEL COMPUTER SCIENCE EXAM NEWEST TESTBANK 2024 WITH ACTUAL QUESTIONS AND CORRECT ANSWERS|ALREADY GRADED A+

AQA A-LEVEL COMPUTER SCIENCE 7517/1 PAPER 1 QUESTIONS AND CORRECT ANSWERS VERIFIED BY EXPERTS |ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS WITH RATIONALE |GUARANTEED PASS |A+ GRADED |LATEST UPDATE

Serial data transmission - Answer Bit are sent one after another along the same data line. Only one line is needed to transmit data in one direction. Parallel data transmission - Answer Several bits are sent simultaneously along separate lines or channels. This means that an 8-bit block of data will require 8 data channels. Problems with parallel data transmission - Answer Skew: - As each individual wire has different properties, bits travel at slightly different speeds and produces...

What is hardware? - Answer The electrical or electro-mechanical parts of a computer What is software? - Answer Software comprises all of the programs that are written to make computers function. What is system software? - Answer System software is the software needed to run the computer's hardware and applications What is an operating system? - Answer Software that lies between application software and hardware. What are utility programs? - Answer Utility software is desig...

computer - Answer machine that processes data computer system - Answer consists of hardware and software that work together to process data / complete tasks. hardware - Answer physical components of a computer e.g. (cpu, motherboard, monitor) software - Answer programs that a computer system runs e.g. (word processors, web browsers, email clients, games) embedded systems - Answer computer systems built into other devices what are embedded systems often used as? - Answer ...

Analysis - Answer Gather information from users about what happens now and what the new system is required to do Design - Answer How will the new system meet its requirements? Input, Output, Processing and Storage designed Implementation - Answer Building the new system. In order to be responsive to changing user needs, prototypes are often used. Testing - Answer It is important to test that the system performs as expected. Different test strategies are used with test plans duri...

Baud Rate - Answer The maximum possible number of signal changes that can occur in a wire per second. Bit Rate - Answer The number of bits that can be sent down a wire per second. Integer - Answer A whole number that can be positive, negative or zero. Examples: -3, 0, 7, 2013588. Natural (Number) - Answer A whole number that is either positive or zero. Examples: 0, 1, 2, 100, 67238. Rational (Number) - Answer Any number that can be represented as the fraction 'a/b...

Natural number - Answer A positive whole number including zero. Integer - Answer Any whole positive or negative number including zero. Rational number - Answer Any number that can be expressed as a fraction or ratio of integers. Irrational number - Answer A number that cannot be represented as a fraction or ratio as the decimal form will contain infinite repeating values. Real number - Answer Any positive or negative number with or without a fractional part. Ordinal numb...

Absolute Error - Answer The difference between the actual number and the nearest representable value. Abstract data type (ADT) - Answer A data type whose properties are specified independently of any particular programming language. Abstraction - Answer Representation that is arrived at by removing unnecessary details. Aggregation - Answer Relationship between two object types in which one object type has a component which is of the other type. Ajax - Answer Web technology ...

Arithmetic Logic Unit (ALU) - Answer The part of the central processing unit that performs arithmetic computations and logical operations Control Unit - Answer Coordinates activities in the CPU, memory and peripherals Clock - Answer A continuous sequence of clock pulses to step the control unit through its operations Registers - Answer Very fast memory stored on or near the processor Program Counter (PC) - Answer Holds the address of the next instruction to be executed C...