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Cumputer science


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Pakin Purananda


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what is operating system
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provides both the environment in which applications can be run and a useable interface between human and computer

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40 questions
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What is operating system
Provides both the environment in which applications can be run and a useable interface between human and computer
What is operating system
Provides both the environment and the
Why is just a horizontal or just a vertical parity check insufficient
You only know there is an error, not where it is
What is echo check
An error detection method where a copy of the data is sent back immediately, if it's not the same, then the original data is sent again
What is the disadvantage of echo checks
You cannot tell if the error was sent during the original transmission, or during the sending of the copy
What is a checksum
An algorithm calculates a checksum value from the data sent, the same algorithm is used the the receivers side. if they are the same then there is no error, if they are different, then a request is sent to send the original data again.
What is check digit
All numbers of the code go through an algorithm to get a check digit, once it goes through the algorithm again and the resulting number divides into 11 without remainders, then the number is valid
What is the process of finding a check digit
Weighting, multiply, addition, remainder, subtraction
What happens after the check digit is found
Gets weighting (at the right) then added to the original addition, then that number is divided by 11. If there is no remainder then the number is valid
What happens when acknowledgement isn't sent back to the sender in an Automatic Repeat Query
Timeout occurs, the sender then sends the data again, until either an acknowledgement is sent back, or a preset number of sendings is met
What happens in ARQ
Automatic Repeat Query. When data is sent, an error detection code is also sent. The receiver then sends back a positive or negative acknowledgement. If negative, the sender sends the data again.
What is syntax highlighting
Colored text based on the type of code AND automatically highlighting errors in code
What is error checking
IDE automatically finding errors in a program
What is IDE
Integrated development environment. Text editor with features to help programmers
What is pretty printing
Automatic spaces and indentations which make code easier to understand
What is translator in IDE
Translating high level language to low level language for the computer to understand
What is run time environment
Software that allows any program to be run on a computer
11 Features of IDE
Syntax highlighting Error checking Line of code Collapsing line Inputs/outputs Autocompletion/correction Pretty printing Translators Run time environment
What is fixed program computer
A computer that can only perform one task (eg, calculator)
What is a stored program computer
A computer that can use many programs
What is CPU
Central processing unit. performs fetch decode execute cycle
What is CU
Control unit. reads instruction form memory
What is ALU
Arithmetic logic unit. Does arithmetic (+-/*). Does logic gates (AND NOT OR etc) and comparisons between values (<>=!=)
What is PC
Program counter. Holds the memory address of the next instruction.
What is operating system
Provides both the environment in which applications ca be run and a useable interface between humans and computer.
What is cache
Memory that is in the CPU itself, it is the fastest to access. stores commonly used instructions and data. Improves Cpu performance.
What is the purpose of a web browser
Software that allows users to access web pages by interpreting HTML to show what is on the website
Features of web browser
HOme page Bookmarks/favourites History Navigating forward/backward between past websites Cookies Tabs Hyperlinks
Benefits of compression
Reduced file size. can fit within file size limits. faster file transfer. less bandwidth needed to transfer files.
Examples of external secondary storage
HDD SDD DVD memory stick, blu ray stick, removable hard drive
What is primary memory
Directly addressable by the CPU. contains RAM ROM and cache memory
What is secondary storage
Not directly addressable by the CPU. All non volatile Can be external or internal can be optical, magnetic, or solid state
Features of ROM
Storing factory settings storing start up routines storing set routines (eg, buttons on a controller for turning left, right, stop)
What is SSL
Secure socket layer. Makes the website secure by establishing an encrypted link between the server and client computer. It is identified by the "S" at the end of HTTPS