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Computer Science Paper 1 OCR (2022) test questions with solutions. Images (Info Card - Flip Now) - Answer -Each pixel has a specific colour, represented by a specific code -Pixel = picture elements -Metadata = additional image information (e.g. when it
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Computer Science Paper 1 OCR (2022) test questions with solutions.
Images (Info Card - Flip Now) - Answer -Each pixel has a specific colour, represented by a specific code
-Pixel = picture elements
-Metadata = additional image information (e.g. when it was created, creator, resolutions, dimensio...
Computer Science Paper 1 OCR (2022) test questions
with solutions.
Describe the fetch-decode-execute cycle. - Answer 1. Memory address copied from PC to
MAR
2.Instructions copied from MAR to MDR
3.PC increases by 1 for the next instruction
4.CU decodes the instructions from the MDR
5.Instruction is performed
6.Repeats process
What are the CPU Components and their Functions? - Answer 1.Arithmetic Logic Unit
(ALU) - performs all math and logic operations
2.Control Unit (CU) - Manages fetch execute cycle, controls flow of data
, 3.Cache - holds regularly used data
What are Registers and their Functions? - Answer Memory Address Register (MAR) - holds
address of current instruction
Memory Data Register (MDR) - holds the instruction
Program Counter (PC) - hods memory address of next instruction
Accumulator (ACC) - temporarily stores calculations from ALU
Memory and Storage - Primary Storage (Info Card - Flip Now) - Answer The need for
Primary Storage:
-It contains all instructions a CPU follows
Difference between RAM and ROM:
-The purpose of ROM in a computer system
Contains instructions a computer needs to boot up (BIOS)
The purpose of Ram in a computer system:
-Aka Main Memory, where everything is stored when used
Virtual Memory:
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