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level: Operating system

Questions and Answers List

level questions: Operating system

QuestionAnswer
What is operating system?A group of programs running in the background of computer which manages basic function
What are the three types of UI? Give a short description for eachGUI( Graphical User Interface) User performs tasks by clicking on icons CLI (Command Line Interface) User types commands to perform tasks Speech Recognition The user speaks commands into microphone
What are the two advantages of GUI?No remembering commands No typing required
What are the two disadvantages of GUI?Takes more resources Limited variety of commands
What are the advantages of CLI?Wider variety of commands Takes less recources
What are the disadvantages of CLI?Typing errors may occur Time consuming Remembering commands
what are the advantages of CR?Hands free Can operate from a distance using telephone
What are the disadvantages of SR?Background noises can cause errors Response is slow
Give applications for each the user interfaceGUI Public places: ATM Self service restaurant Mobile phone CLI Software developers SR Public places Home service
What is Multitasking ?When one user performs several tasks on the same computer simultaneously
What is multiprogramming?When several programs are run on the same computer simultaneously
What is batch processing?Data is collected over a period of time without interuption Eg: Calculating salary, Report cards
What is Real time?Data is processed and output immediately Eg: Monitoring patient, Burglar system, Deposit and withdrawal system
What is error handling ?Operating systems, detect errors, and takes appropriate actions. Actions it may take are sending a message to shutdown program causing errors
What is managing user account ?A user name and password is given to each user, OS can create and delete user account
What is file utility?Small program that performs simple tasks such as copy, paste, rename and move files
What is processor management?When multiprogramming, the processor must switch between the different programs running, doing a little bit of each, time sharing OS manages the time
What is memory management?All running programs must be in the memory when it is executing, the OS allocates sperate memory area for each of these programs, and relocates the memory once the program has been complete
What is OS security ?OS provides security to the users data stored in the computer Eg: Passwords, Firewalls, Encryption, Automatic backups
What is an interrupt ?A signal sent by anther hardware or a running programs requesting the processor to suspend its current tasks and perform another Eg: When the printer is out of paper it sends an interrupt, the processor responds by displaying an error message
What is interrupt handler?The program called by the OS when interrupts is received, the interrupt handler will make a suitable response to the interrupt
What is a buffer?A temporary memory store used to compensate for the speed difference between two communicating devices