Which of these does the control unit NOT do

Controls the logic unit sending data to the accumulator

How does clock speed effect performance?

More clock pulses means instructions processed faster

how does the number of cores affect speed?

More cores means tasks can be done simultaneously

Describe the purpose of the MAR

The MAR fetches the instruction and copies it to the MDR.

When is the PC incremented?

As soon as the instruction has been fetched

State the purpose of the PC

Holds the instruction to be executed next.

State the purpose of the Accumulator

Transfers the result of an instruction to memory., Holds the result of an instruction.

To fetch, decode and execute instructions

How does cache effect speed?

Cache is close to the processor so can be accessed faster

State the purpose of the MAR

Holds the memory address of the current instruction.

What is an embedded system

A single microprocessor that controls a single device

Very fast memory that stores data most often used by the cpu

Describe the purpose of the ALU

Performs logic operations such as comparison or , Performs arithmetic operations such as Add and Subtract

State the purpose of the MDR

Holds the actual and instruction and data.

Describe Von Neumann architecture

Programs and data are stored in the same memory

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Unit 1 Computer Science

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A #computing #ocr quiz that is actually decent and challenging / useful for revision. Not just here's the right answer and 3 answers that are clearly not correct.

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Questions 17

Answers

1
Which of these does the control unit NOT do
Controls the logic unit sending data to the accumulator
Monitors attached hardware
Controls input and output of data
Controls the flow of data inside the CPU
2
How does clock speed effect performance?
More speed means less memory usage
More clock pulses means instructions processed faster
Clock speed increase means more errors which impacts the cpu
Faster the clock speed faster the memory access is
3
how does the number of cores affect speed?
More cores means one task will be split up and done faster
More cores means faster memory transfer to/from Ram
More cores means double or quad speed
More cores means tasks can be done simultaneously
4
Describe the purpose of the MAR
The MAR fetches data from the MDR.
The MAR fetches the instruction and copies it to the MDR.
The MAR fetches the instruction from memory and decodes it.
The MAR fetches the instruction only.
5
When is the PC incremented?
When logic unit has finished with the current instruction.
When the MDR sends the instruction to the accumulator.
As soon as the instruction has been decoded
As soon as the instruction has been fetched
6
State the purpose of the PC
Holds the instruction to be executed next.
Fetches the instruction from the CIR.
Holds the data to be executed next.
Fetches the instruction from memory.
7
State the purpose of the Accumulator
Transfers the result of an instruction to memory.
Transfers the address of an instruction to memory.
Holds the current instruction that was executed.
Holds the result of an instruction.
8
Purpose of the CPU
Run the tasks of the computer
It is the brain of the computer and controls the computer
Run instructions and process inputs
To fetch, decode and execute instructions
9
Order the registers used in the correct order for the F-D-E cycle instruction ADD #4
MDR to MAR to CIR to PC
PC to MAR to MDR to CIR
PC to MAR to MDR to CIR to MAR to MDR
PC to MAR to MDR to MAR to MDR
10
How does cache effect speed?
Cache can store more instructions than ram
Cache size doesn't affect CPU speed
Cache is faster at reading data from memory
Cache is close to the processor so can be accessed faster
11
State the purpose of the MAR
Holds the actual instruction to be executed.
Holds the data that has been fetched from memory
Holds the memory address of the current instruction.
Holds the actual data to be executed.
12
What is an embedded system
A computer inside another device
A CPU that controls the device
A single microprocessor that controls a single device
Hardware hidden inside an object
13
What is NOT an example of an embedded system
Dish Washer
Washing Machine
Sat Nav
PC Speakers
14
What is Cache
Very fast memory that stores data most often used by the cpu
Very fast memory used by the MAR
Very fast memory used when ram is full
Very fast memory used as secondary storage
15
Describe the purpose of the ALU
Performs calculations on data from memory
Performs logic operations such as comparison or < & >
Performs logical instructions and transfers result to memory
Performs arithmetic operations such as Add and Subtract
16
State the purpose of the MDR
Holds the actual and instruction and data.
Holds the result of an instruction.
To fetch instructions from memory
To decode instructions.
17
Describe Von Neumann architecture
Programs are stored in ram and data is stored on the HDD.
Programs and data are stored separately
Programs and data are stored in the same memory
Programs and data are stored in Virtual Memory.

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