Techincal Interview Questions - Operating System (OS)

Operating System Questions

· What are the basic functions of an operating system?
· Explain briefly about, processor, assembler, compiler, loader, linker and the functions executed by them.
· What are the difference phases of software development? Explain briefly?
· Differentiate between RAM and ROM?
· What is DRAM? In which form does it store data?
· What is cache memory?
· What is hard disk and what is its purpose?
· Differentiate between Complier and Interpreter?
· What are the different tasks of Lexical analysis?
· What are the different functions of Syntax phase, Sheduler?
· What are the main difference between Micro-Controller and Micro- Processor?
· Describe different job scheduling in operating systems.
· What is a Real-Time System ?
· What is the difference between Hard and Soft real-time systems ?
· What is a mission critical system ?
· What is the important aspect of a real-time system ?
· If two processes which shares same system memory and system clock in a distributed system, What is it called?
· What is the state of the processor, when a process is waiting for some event to occur?
· What do you mean by deadlock?
· Explain the difference between microkernel and macro kernel.
· Give an example of microkernel.
· When would you choose bottom up methodology?
· When would you choose top down methodology?
· Write a small dc shell script to find number of FF in the design.
· Why paging is used ?
· Which is the best page replacement algorithm and Why? How much time is spent usually in each phases and why?
· Difference between Primary storage and secondary storage?
· What is multi tasking, multi programming, multi threading?
· Difference between multi threading and multi tasking?
· What is software life cycle?
· Demand paging, page faults, replacement algorithms, thrashing, etc.
· Explain about paged segmentation and segment paging
· While running DOS on a PC, which command would be used to duplicate the entire diskette?