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5.0
GCSE COMPUTER SCIENCE (OCR) QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /ALREADY GRADED A+
Q: Arithmetic Logic Unit (ALU)
Ans: Performs operations on data e.g. Addition, subtraction
Q: Control Unit (CU)
Ans: Coordinating activities of the CPU
Q: Registers
Ans: Quick, small stores of data within the CPU
Q: Memory Address Register (MAR)
Ans: Holds memory address for data or a instruction about to be used by the
CPU
Q: Memory Data Register (MDR)
Ans: Holds actual data or instruction
Q: Accumulator
Ans: Stores results of calculations in the ALU
Q: Program Counter (PC)
,Ans: Holds memory address of the instruction for each cycle
Q: Fetch
Ans: The next instruction is retrieved by CPU from main memory
Q: Decode
Ans: The instruction is broken down and decided so computer can
understand
Q: Execute
Ans: The CPU performs what the instructions told
Q: Embedded System
Ans: A computer system built within a large device e.g. Camera, washer,
car
Q: Volatile
Ans: Memory loses its data when power of
Q: Non-volatile
Ans: Memory retains its data when power is lost
Q: Random Access Memory (RAM)
Examstudy - Stuvia US
,Ans: Read/write - function is to load open programs and operating system
data currently in use - volatile
Q: Read Only Memory (ROM)
Ans: Can only be read, can't be changed, stores essential programs to be
run in order to boot the computer - non-volatile
Q: Cache
Ans: A type memory that stores copies of frequently used data, much faster
than RAM, lower capacity - closer to CPU
Q: Buses
Ans: Collection of wires that carry signals between various components of
the computer system
Q: Central Processing Unit (CPU)
Ans: Processes all of the data and instructions that make the system work -
can be effected by clock speed, number of cores, cache size
Q: Clock speed
Ans: How fast the computer does the FDE cycle
Q: virtual memory
Ans: A memory management procedure needed when the RAM is full so a
temporary section is made which acts like a part of RAM
Examstudy - Stuvia US
, Q: Flash memory
Ans: Solid state storage, non-volatile, more reliable/durable but can only be
overwritten a limited number of times
Q: Graphics Processing Unit (GPU)
Ans: Handles graphics and image processing
Q: Optical storage
Ans: CD, DVD, Blue-ray
ADV: cheap,easy to transport
DIS: slow, less storage than hard drives, stored data degrades over time,
cannot be written over
Q: Magnetic storage
Ans: Hard drives
ADV: fast access, stores large amounts of data, low cost
DIS: not very portable, easily be broken
Q: Solid State storage
Ans: USB, flash memory, SD
ADV: fast, small, light, easily potable, quiet
DIS: more expensive, storage capacity less, limited number erase/write
cycles
Q: Cloud stotage
Examstudy - Stuvia US
In today's fast-paced educational landscape, students need reliable resources to excel in their studies.
5.0
GCSE COMPUTER SCIENCE (OCR) QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /ALREADY GRADED A+
Q: Arithmetic Logic Unit (ALU)
Ans: Performs operations on data e.g. Addition, subtraction
Q: Control Unit (CU)
Ans: Coordinating activities of the CPU
Q: Registers
Ans: Quick, small stores of data within the CPU
Q: Memory Address Register (MAR)
Ans: Holds memory address for data or a instruction about to be used by the
CPU
Q: Memory Data Register (MDR)
Ans: Holds actual data or instruction
Q: Accumulator
Ans: Stores results of calculations in the ALU
Q: Program Counter (PC)
,Ans: Holds memory address of the instruction for each cycle
Q: Fetch
Ans: The next instruction is retrieved by CPU from main memory
Q: Decode
Ans: The instruction is broken down and decided so computer can
understand
Q: Execute
Ans: The CPU performs what the instructions told
Q: Embedded System
Ans: A computer system built within a large device e.g. Camera, washer,
car
Q: Volatile
Ans: Memory loses its data when power of
Q: Non-volatile
Ans: Memory retains its data when power is lost
Q: Random Access Memory (RAM)
Examstudy - Stuvia US
,Ans: Read/write - function is to load open programs and operating system
data currently in use - volatile
Q: Read Only Memory (ROM)
Ans: Can only be read, can't be changed, stores essential programs to be
run in order to boot the computer - non-volatile
Q: Cache
Ans: A type memory that stores copies of frequently used data, much faster
than RAM, lower capacity - closer to CPU
Q: Buses
Ans: Collection of wires that carry signals between various components of
the computer system
Q: Central Processing Unit (CPU)
Ans: Processes all of the data and instructions that make the system work -
can be effected by clock speed, number of cores, cache size
Q: Clock speed
Ans: How fast the computer does the FDE cycle
Q: virtual memory
Ans: A memory management procedure needed when the RAM is full so a
temporary section is made which acts like a part of RAM
Examstudy - Stuvia US
, Q: Flash memory
Ans: Solid state storage, non-volatile, more reliable/durable but can only be
overwritten a limited number of times
Q: Graphics Processing Unit (GPU)
Ans: Handles graphics and image processing
Q: Optical storage
Ans: CD, DVD, Blue-ray
ADV: cheap,easy to transport
DIS: slow, less storage than hard drives, stored data degrades over time,
cannot be written over
Q: Magnetic storage
Ans: Hard drives
ADV: fast access, stores large amounts of data, low cost
DIS: not very portable, easily be broken
Q: Solid State storage
Ans: USB, flash memory, SD
ADV: fast, small, light, easily potable, quiet
DIS: more expensive, storage capacity less, limited number erase/write
cycles
Q: Cloud stotage
Examstudy - Stuvia US
