Interview Questions

Operating System Interview questions

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Operating system Interview questions with answers posted on August 06, 2008 at 18:10 pm by Amit Satpute Explain the meaning of Kernal. The kernel is the essential center of a computer operating system, the core that........             Read answer What is a command interpreter? The part of an Operating System that interprets commands and carries them out......... Read answer What is a daemon? In Unix and some other operating systems, a daemon is a computer program that runs......... Read answer Explain the basic functions of process management. The basic functions of the OS wrt the process management are :........ Read answer What is a named pipe? A connection used to transfer data between separate processes, usually on separate computers. ........ Read answer What is pre-emptive and non-preemptive scheduling? Tasks are usually assigned with priorities. At times it is necessary to run a certain......... Read answer What is a semaphore? A semaphore is a variable. There are 2 types of semaphores:......... Read answer Explain the meaning of mutex. A mutex and the binary semaphore are essentially the same.......... Read answer What are the different types of memory? the types of memory in a computer system are: ......... Read answer Explain the meaning of virtual memory. Virtual memory is an approach to make use of the secondary storage devices as an extension......... Read answer Operating system Interview questions with answers posted on May 06, 2009 at 13:10 pm by Vidya Sagar  What is RTOS? A certain capability within a specified time constraint is guaranteed by an operating system called ‘real time operating system’....... Read answer What is the difference between hard real-time and soft real-time OS? Critical task completion on time is guaranteed by a hard real time system...... Read answer What type of scheduling is there in RTOS? The tasks of real time operating system have 3 states namely, ‘running’, ’ready’, ‘blocked’........... Read answer What is interrupt latency? The time between a device that generates an interrupt and the servicing of the device that generated the interrupt is known as interrupt latency........... Read answer What is priority inheritance? Priority inversion problems are eliminated by using a method called priority inheritance........... Read answer What is spin lock? In a loop a thread waits simply (‘spins’) checks repeatedly until the lock becomes available............    Read answer What is an operating system? What are the functions of an operating system? An operating system is an interface between hardware and software. OS is responsible for managing and co-ordinating the activities of a computer system.................. Read answer What is paging? Why paging is used? OS performs an operation for storing and retrieving data from secondary storage devices for use in main memory. Paging is one of such memory management scheme................. Read answer Difference between a process and a program - A program is a set of instructions that are to perform a designated task, where as the process is an operation which takes the given instructions and perform the manipulations as per the code............... Read answer What is the meaning of physical memory and virtual memory? Physical memory is the only memory that is directly accessible to the CPU. CPU reads the instructions stored in the physical memory and executes them continuously............... Read answer What is the difference between socket and pipe? Sockets: Socket is a part of OSI layer model. Communication among different layers is performed through sockets. Application layer serves through some sockets to the presentation layer and upper application layer................ Read answer What are the difference between THREAD, PROCESS and TASK? A program in execution is known as ‘process’. A program can have any number of processes. Every process has its own address space.................. Read answer Difference between NTFS and FAT32 The differences are as follows:NTFS:- Allows the access local to Windows 2000, Windows 2003, Windows NT with service pack 4 and later versions may get access for some file.................. Read answer Differentiate between RAM and ROM RAM: - Volatile memory  - Electricity needs to flow continuously - Program information is stored in RAM - RAM is read / write memory.............. Read answer What is DRAM? In which form does it store data? DRAM – Dynamic Random Access Memory. One of the read / write memory. DRAM is cheap and does the given task................ Read answer What is cache memory? Explain its functions. Cache memory is RAM. The most recently processing data is stored in cache memory. CPU can access this data more quickly than it can access data in RAM................ Read answer Differentiate between Complier and Interpreter - The program syntax is checked by the compiler; where as the keywords of the program is checked by the interpreter...................... Read answer Describe different job scheduling in operating systems. Job scheduling is an activity for deciding the time for a process to receive the resources they request. First Come First Served: In this scheduling, the job that is waiting for a long time is served next................ Read answer What is a Real-Time System? Real-time system is the study of hardware and software, which are subject to the operational deadlines from event to the system response................. Read answer What do you mean by deadlock? Dead lock is a situation of two or more processes waiting for each other to finish their tasks. In this situation no progress or no advancement is made............... Read answer Difference between Primary storage and secondary storage Primary memory storages are temporary; where as the secondary storage is permanent. Primary memory is expensive and smaller, where as secondary memory is cheaper and larger................ Read answer Next>>