OPERATING SYESTEMS- INTERVIEW QUESTIONS
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What is an OPERATING SYSTEM?
An Operating System is a software program that enables the computer hardware to communicate and operate with the computer software.

What are the basic functions of an OPERATING SYSTEM?

What are the different types of OPERATING SYSTEM?
Graphical User Interface OS
Multi-user OS
Multiprocessing OS
Multitasking OS
Multithreading OS

What is Graphical User Interface OS?
Short for Graphical User Interface, a GUI Operating System contains graphics and icons and is commonly navigated by using a computer mouse. See our GUI dictionary definition for a complete definition. Below are some examples of GUI Operating Systems.
System 7.x
Windows 98
Windows CE

What is Multi-user OS?
Multi-user Operating System allows for multiple users to use the same computer at the same time and/or different times. See our multi-user dictionary definition for a complete definition for a complete definition. Below are some examples of multi-user Operating Systems.
Linux
Unix
Windows 2000
Windows XP
Mac OS X

What is Multiprocessing OS?
An Operating System capable of supporting and utilizing more than one computer processor. Below are some examples of multiprocessing Operating Systems.
Linux
Unix
Windows 2000
Windows XP
Mac OS X

What is Multitasking OS?
An Operating system that is capable of allowing multiple software processes to run at the same time. Below are some examples of multitasking Operating Systems.
Unix
Windows 2000
Windows XP
Mac OS X

Why paging is used?

What is virtual memory?
Virtual memory is hardware technique where the system appears to have more memory that it actually does. This is done by time-sharing, the physical memory and storage parts of the memory one disk when they are not actively being used.

What is Throughput, Turnaround time, waiting time and Response time?
Throughput – number of processes that complete their execution per time unit. Turnaround time – amount of time to execute a particular process.
Waiting time – amount of time a process has been waiting in the ready queue. Response time – amount of time it takes from when a request was submitted until the first response is produced, not output (for time-sharing environment).

What is a Real-Time Operating System (RTOS)?