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WorksheetsOCR GCSE Computer Science Revision Paper 1- Saim C :D
Total questions: 98
Worksheet time: 48mins
State the purpose of the CPU.
Contains the CU
Executes all of the stored program instructions
Contains registers
Interprets instructions
Define the purpose of the CU
Controls all the other components of the CPU.
Interprets program instructions and tells the ALU what operations to carry out
Electrical conductors
A very fast RAM
Define the purpose of the ALU
Controls the flow of data
A simple memory location stored within the CPU which helps with the storage of application software
Performs the arithmetic and logical operations to carry out program instructions
Controls what rate instructions are executed.
What is the clock?
The time between a input such as a key being pressed and the output of the key being presented.
The time taken to send a packet across a network
The time taken for a router to connect to the internet
Controls the speed at which program instructions are carried out, by sending control electrical signals at regular intervals,AKA cycles
Define the purpose of the decoder.
Used to find bugs in the PC to ensure the PC runs smoothly and at its best performance
To translate the instructions and tells the other components, ALU what operations to carry out
Executes logical operations and arithmetic operations.
To transport instructions around the motherboard
How does a bus transport data across the motherboard.
Electrical conductors that carry electrical signals between components.
A bus is a little wire which passes on instructions by the internet
What is clock speed?
How many clock cycles can be performed within a second.
The GHz
How many instructions can be carried in 1 second.
The speed of how quickly a PC is able to respond to inputs.
Which is not located in the CPU?
RAM
Mouse
CU
Fan
Which of the following is an example of 'main memory'.
Hard Drive
USB Drive
RAM
ROM
Role of the MDR?
Temporary store buffer
Stores result from ALU
Holds address of the memory currently being read or read from
Holds the address of the next instruction to be fetched
What is the function of the program counter?
Holds address of the memory location currently being read or written to
Stores results from ALU
Holds address of the next instruction to be fetched
Temporary buffer
What is the accumulator?
Temporary buffer
Stores the results from the ALU
Holds address of the memory location being written or read to
Holds address of the next instruction to be fetched
What is the MDR
Holds address of the next instruction
Temporary buffer
Holds results from the ALU
Holds the address of the current memory location being read or written to
What is the correct order of instructions being executed?
EDF
FDE
DFE
Which one of these is a detailed description of FDE?
CPU(Asks for instruction)-->Data Bus-->RAM(Where instructions and data is stored)--> Address Bus-->Decoder(Decodes the instruction so the)-->ALU(Executes the instructions)-->Accumulator (Where results are stored)
CPU(Asks for instruction)-->Address Bus-->RAM(Where instructions and data is stored)--> Data Bus-->Decoder(Decodes the instruction so the)-->ALU(Executes the instructions)-->Accumulator (Where results are stored)
RAM(Asks for instruction)-->Address Bus-->CPU(Where instructions and data is stored)--> Data Bus-->Decoder(Decodes the instruction so the)-->ALU(Executes the instructions)-->Accumulator (Where results are stored)
RAM(Asks for instruction)-->Data Bus-->CPU(Where instructions and data is stored)-->Address Bus-->Decoder(Decodes the instruction so the)-->ALU(Executes the instructions)-->Accumulator (Where results are stored)
Select which of these affect performance of a computer.
CPU (Clock Speed)
If its single or multi core
GPU
Amount of Cache
Amount of RAM
Explain how Cache affects performance?
Cache is high speed memory used to store frequently stored instructions the larger the cache size the less the RAM, which is the slower main memory needs to be accessed. Therefore the CPU does not need to wait longer for data to be delivered as cache is also located closer to the CPU than the RAM.
Cache reduces performance due to the fact that as it gets bigger it is harder to find data as there are more items of data the PC needs to search through.
The higher the Cache the better as if you have more of a data storage the better as there is more instructions which you are able to store meaning that the CPU will perform faster.
Select the advantages of multicore processors
The program may be sequential
The cores can work together- Parallel Processing
The cores can work on separate tasks at the same time-Multitasking
The cores get to keep more of their power reserved as the others can do the job for them
Select the disadvantages of multi core processors.
Some programs may be sequential
It takes time for the processors to decide which processor is going to perform each task
The processors may run out of read/write cycles
Not all programs support multi core processing
Which one is a faster rig?
Single Core 3GHz Processor
Dual Core 2GHz PRocessor
What is another term used to describe Embedded Systems?
PCB
Real Time Systems
Insider Systems
What are the main components of a PCB which contains a embedded system?
Processor
Memory
Input/Output User Interface
A fan
Define an embedded system.
A system built for small range of specific tasks.
A computer system built into another device in order to control it.
A computer system built into another device to perform no tasks but just for decor.
A PCB
Explain the function of one embedded system within a washing machine.
The monitoring of the water temperature so that it can turn the heating element on and off.
The whole machine itself , its purpose is to wash clothing items.
Which can be written and read to?
RAM
ROM
Which one can only be read to?
RAM
ROM
Which one stores application data?
RAM
ROM
Which one stores BIOS?
RAM
ROM
Describe the difference between volatile and non-volatile with examples.
The content of non-volatile memory is not lost when power is turned off where as with volatile it is. Content of volatile memory constantly changes such as in RAM and where as non-volatile it is fixed and cant be altered, such as ROM.
The content of non-volatile memory is lost when power is turned off where as with volatile it is not . Content of volatile memory constantly changes such as in ROM and where as non-volatile it is fixed and cant be altered, such as RAM.
In volatile the memory is kept in virtual storage or secondary storage which means that there will always be a place to keep data whether you have power or not. Your data can can be read and written to. BIOS is located in volatile memory.
What is meant by virtual memory?
An area of RAM which is used temporarily when the SSD or HDD is full.
Area of HDD or SSD used at temporary storage when the RAM is full.
An area of HDD or SSD which is used when the cache is full
A Level 3 Chache used when the RAM is full
Program instructions and data are constantly moving between CPU and RAM
True
False
Which one is swapped out during virtual memory.
Frequent used data
Least frequent used data
The components involved in virtual memory are: CPU,RAM,Cache
True
False
Select the disadvantage(s) of virtual memory.
The read write head of HDD is slower than the RAM
Disc Thrashing
if the OS is constantly swapping data the programs will run slower
Which is an advantage of virtual memory?
The PC will run faster as it is near the CPU
The program operation will continue even when memory is full
Select the general features of secondary storage
Non-Volatile
Not directly accessed by CPU
Long-Term Storage
SSD
Which is an example of Magnetic Storage
USB Flash Drive
HDD
SSD
DVD
Which of these is an example of optical storage?
CD
SSD
USB
HDD
Which of these is a example of Solid State Storage?
HDD
USB
DVD/Blu-Ray
USB Flash Drives
Which of these contains a laser?
Optical
Magnetic
Solid State
Which of these contains no moving parts?
Magnetic
Optical
Solid State
Which of these contain a read/write arm?
Solid State
Magnetic
Optical
Where will you find the described type of secondary storage ? "Data is encoded as opposing magnetic polarities on the surface of the disc. Electromagnets in the read/write head , read and write the data.
HDD
USB Flash Drive
CD
What type of storage does this describe? "Discs use a laser to read an write data. The datais encoded as a series of pits representing 1s and 0s in a spiral track running from inside to outside of the track."
Optical
Magnetic
Solid State
Which secondary storage type does this description describe? " Made up of flash memory which is non volatile , it can be electrically erased and reprogrammed. It uses arrays of transistors which operate in 1s and 0s and are changed via electrical signals. Data is encoded as binary digits"
Solid State
Optical
Magnetic
Which of these is not a example of secondary storage?
USB
SSD
SD Cards
HDD
Which type of secondary storage is the largest per GB?
Optical
Solid State
Magnetic
Which type of secondary storage is the fastest?
Optical
Solid State
Magnetic
Which type of secondary storage(s) is the cheapest?
Optical
Magnetic
Solid State
Which of these secondary storage types is the most portable?
Solid State
HDD
Optical
Which secondary storage is most likely to be found in a mobile phone?
Optical
Solid State
Magnetic
How much data can a compact disc store?
700MB
70 GB
7TB
4.7GB
Which type of network spans over a small geographical area?
LAN
WAN
Which of these is the Internet an example of?
LAN
WAN
A network which is located in a big school is a WAN
True
False
Select factors that affect network performance
Bandwidth
Hardware/Software
Number of users
The amount of RAM in each client's PC
Bandwidth is.........
Can lead to collisions of data packets resulting in transmission errors the packets have to be resent
Is the maximum amount of data that can pass through the medium per second
Routers and switches can affect performance
can cause network congestion, leading to packets being queued before being transmitted by routers and switches
Hardware and software limitations means....
Is the maximum amount of data that can pass through the medium per second
Such as routers and switches can affect performance
Can cause network congestion, leading to packets being queed before being transmitted by routers and switches
Collisions of data packets resulting in transmission errors the packets have to be resent
A high number of users on a network means....
Collisions of data packets resulting in transmission errors the packets have to be resent
The maximum amount of data that can pass through the medium per second
Can cause network congestion, leading to packets being queued before being transmitted by routers and switches
The maximum amount of data that can pass through the medium per second
A high network traffic means....
Can cause network congestion, leading to packets being queued before being transmitted by routers and switches
It can lead to collisions of data packets resulting in transmission errors the packets have to be resent
The maximum amount of data that can pass through the medium per second
Such as routers and switches can affect performance
Which piece of hardware will you NOT see in a peer-to-peer network?
Printer
Server
Computer
Laptop
Which of these can you find in a server-client network?
Printer
Computer
Server
Laptop
In a peer-peer network, "There is no_____ to manage the network, all computers are equally connected"
Client
Node
Server
"Computers communicate through a central piece of hardware which manages the network" Which network type does this apply to?
Client-Server
Peer-Peer
Which type of network stores data centrally?
Client-Server
Peer-Peer
Which network requires each user to be responsible for backing up each client?
Server-Client
Peer-Peer
Select the advantages of sing a client-server network over a peer-peer network.
Network is controlled centrally rather than each client.
It helps the CPUs in the clients last longer since they dont need to save files themselves
All files can be saved centrally rather than on each client
All backups can be done centrally on each client
Copper wire transmits data as electric signals
True
False
Fibre Optic transmits data as pulses of data
True
False
Which ones cheaper?
Fibre Optic Cable
Copper cable
Which one transmits signals at a faster speed and over greater distances?
Copper
Fibre Optic
Which one transmits data slower than the others?
Wireless
Fibre Optic
Copper
Which transmission media does this describe: "Easy to install just need WAP"
Wireless
Cable
Which type of transmission media is more expensive?
Cable
Wireless
Which network transmission is more easily infiltrated?
Wireless
Cable
Which type of transmission media is more likely to be interfered by walls and other electric equipment?
Wireless
Cable
Which type of transmission media has more mobility?
Wireless
Cable
Hubs send messages to every computer on the network
True
False
Switches read the MAC address and send messages to only the computer which is the intended recipient
True
False
Hubs and Switches are used to link computers so that they can communicate
True
False
Select the purpose of routers.
Connect networks together
Read addresses and forward to correct network
Used to transfer data between a home network and the internet
Similar to hubs , they do not read the adresses
Select the purposes of Wireless Access Points
Wireless devices need WAP to connect to cabled networks
Convert data from Wireless<-->Cabled signals
Often used for hotspots in public ares
Unlike switches they do not read the destination addresses and direct the messages to all devices
A host is a computer accessed by users at remove locations over a network
True
False
Who handles technical and security issues on the internet?
Hosting Company
The Clients
What does IP stand for?
Internet Protocol
Internet Password
Internet Provider
Is a 32 Bit IP Address...?
IPv4
IPv6
Which is the domain?
mysite.co.uk
www.mysite.co.uk
How many bits do IPv6 contain?
64
128
32
When a browser requests access to a host , the client computer contacts.....?
Router
Server
DNS
What are the correct steps of when a client requests access to host via domain name?
1: Client enters the domain name into browser
2:Client contacts router to resolve the domain name
3:If it is not found a WAP is contacted
4:Either one of the sends the domain name
5:The server returns the IP address to the client
6:The client gets access to host using IP Address
1: Client enters the domain name into browser
2:Client contacts DNS server to resolve the domain name
3:If it is not found a second DNS server is contacted
4:Either one of the DNS server sends the domain name
5:The server returns the IP address to the client
6:The client gets access to host using IP Address.
In a .. network each node is connected individually to a central point which can be a file server,hub or switch.
Mesh
Star
Bus
Which network has minimum network traffic?
Star
Mesh
Which network has alternative routes for data if one route fails to work?
Star
Mesh
Which network can you add more devices easily onto?
Star
Mesh
Which network has a central point that if it fails will fail the whole network?
Star
Mesh
Which network requires more cable if a cabled network is used?
Star
Mesh
What are protocols?
The Law which decides whether a person is allowed to use someone else's work while giving them attribution (credit)
Rules that computers must follow when they are transferring data over a network
The Law which decides how a computer should not be misused, such as to gain entry without permission and cause harm
Select 3 tasks carried out by protocols in the transmission of data over a network.
Connect networks together to be able to send data/packets
Split data into packets
Add the address of the recipient computer
Notify the sending computer when the data is received
