Top Operating Systems General Concepts Interview Questions :: ALLInterview.com http://www.allinterview.com Top Operating Systems General Concepts Interview Questions en-us What is Difference between thread and process? http://www.allinterview.com/showanswers/258.html The major difference between threads and processes is 1.Threads share the address space of the process that created it; processes have their own address. 2.Threads have direct access to the data segment of its process; processes have their o What is the difference between mutex and semaphore? http://www.allinterview.com/showanswers/266.html The only real difference between a Semaphore and a Mutex is that a Semaphore can have a count > 1. While a mutex will only let one owner attempt access, a Semaphore can be assigned a number and allow "x" number of threads access. What is the difference between primary & secondary storage devic http://www.allinterview.com/showanswers/1333.html In primary storage device the storage capacity is limited. It has a volatile memory. In secondary storage device the storage capacity is larger. It is a nonvolatile memory. Primary devices are: RAM / ROM. Secondary devices are: Floppy disc / What is a binary semaphore? What is its use? http://www.allinterview.com/showanswers/1347.html A binary semaphore is one, which takes only 0 and 1 as values. They are used to implement mutual exclusion and synchronize concurrent processes What is the difference between microprocessor and microcontroller? http://www.allinterview.com/showanswers/1332.html In Microprocessor more op-codes, few bit handling instructions. But in Microcontroller: fewer op- codes, more bit handling Instructions, and also it is defined as a device that includes micro processor, memory, & input / output signal lin Differentiate between RAM and ROM? http://www.allinterview.com/showanswers/1336.html RAM: Read / Write memory, High Speed, Volatile Memory. ROM: Read only memory, Low Speed, Non Voliate Memory. Can we execute any simple program without installing any Operating s http://www.allinterview.com/showanswers/16585.html Yes you are right. Using machine language we can run program without OS. Difference between static and dynamic RAM? http://www.allinterview.com/showanswers/1334.html Static RAM: No refreshing, 6 to 8 MOS transistors are required to form one memory cell, Information stored as voltage level in a flip flop. Dynamic RAM: Refreshed periodically, 3 to 4 transistors are required to form one memory cell, Informat What is multi-tasking, multi-programming,multi-threading? http://www.allinterview.com/showanswers/7614.html Multiprogramming is the technique of running several programs at a time using timesharing. It allows a computer to do several things at the same time. Multiprogramming creates logical parallelism. The concept of multiprogramming is that the o What level of security does Windows NT meets? http://www.allinterview.com/showanswers/15153.html C2 level security. An Infosys Question : I + Opposite of, W + Initial of, Ice + twic http://www.allinterview.com/showanswers/35808.html I Miss You what is the difference btn collision domain and broad cast domain? http://www.allinterview.com/showanswers/16586.html visit http://www.geekinterview.com/question_details/24724 Explain about paged segmentation and segment paging? http://www.allinterview.com/showanswers/7618.html segmention --> rectifies internal fragmentation paging scheme--> rectifies external fragmentation combine the both schemes and eliminates both problems in managing the memory paged segmentation divide program's logical addressspac What is mutant? http://www.allinterview.com/showanswers/15145.html In Windows NT a mutant provides kernel mode or user mode mutual exclusion with the notion of ownership. Advantage of SRAM over DRAM ? http://www.allinterview.com/showanswers/5219.html 1.Simplicity: SRAMs don't require external refresh circuitry or other work in order for them to keep their data intact. 2.Speed: SRAM is faster than DRAM. MAin advantage is that Static RAM is a type of RAM that holds its data without