Operating system interview questions and answers for freshers pdf

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1) Explain the main purpose of an operating system? Operating Top 50 Operating System Interview Questions & Answers .. Download PDF. Contains Important Operating system Interview Questions with Answers and For Freshers/Experienced | Operating System Questions For Interview | Online and Answers PDF | Interview Questions in Operating System | Operating System . Operating Systems Interview Questions. 1 aracer.mobiumar, mail: Ans: An operating system is a program that acts as an intermediary between the user and the computer .. common variables, updating tables, writing a file and so on. Only one.

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Operating System Interview Questions And Answers For Freshers Pdf

India's No.1 Job Portal for freshers - aracer.mobi . Kernel is the core and essential part of computer operating system that provides basic services for all parts of OS. Semaphore is a variable, whose status reports common resource, . + Operating System Interview Questions and Answers, Question1: Explain the main purpose of an operating system? Question2: What is demand paging?. Operating system, OS interview questions and answers - Here are all possible Operating System interview questions with answers that might be asked during.

What is a process and process table? What are different states of process A process is an instance of program in execution. For example a Web Browser is a process, a shell or command prompt is a process. The operating system is responsible for managing all the processes that are running on a computer and allocated each process a certain amount of time to use the processor. In addition, the operating system also allocates various other resources that processes will need such as computer memory or disks. To keep track of the state of all the processes, the operating system maintains a table known as the process table. Inside this table, every process is listed along with the resources the processes is using and the current state of the process. Processes can be in one of three states:

Commonly Asked Operating Systems Interview Questions | Set 1

This is due to an inordinate number of page faults. List the Coffman's conditions that lead to a deadlock. Mutual Exclusion: Only one process may use a critical resource at a time.

No Pre-emption: No resource can be forcible removed from a process holding it. Circular Wait: A closed chain of processes exist such that each process holds at least one resource needed by another process in the chain. What are short, long and medium-term scheduling? Long term scheduler determines which programs are admitted to the system for processing.

It controls the degree of multiprogramming. Once admitted, a job becomes a process. Medium term scheduling is part of the swapping function. This relates to processes that are in a blocked or suspended state.

OS Interview Questions updated on Jun

They are swapped out of real-memory until they are ready to execute. The swapping-in decision is based on memory-management criteria. High-density multisurface disks are more likely to be affected by this than low density ones. Questions What are the stipulations of C2 level security? The C PU is not engaged in any real productive activity during this period, and the process does not progress toward completion.

Questions Explain the popular multiprocessor thread-scheduling strategies. A global queue of 16 threads is maintained. Each processor, when idle, selects a thread from this queue. Note that load balancing refers to a scheme where work is allocated to processors on a more permanent basis.

Group scheduling predated this strategy. For the duration of program execution, each program is allocated a set of processors equal in number to the number of threads in the program. Processors are chosen from the available pool.

Questions When does the condition 'rendezvous' arise? Questions What is a trap and trapdoor? A trap is a software interrupt, usually the result of an error condition. Questions What are local and global page replacements?

Global replacement policy allows any page frame from any process to be replaced. The latter is applicable to variable partitions model only. Rotational delay or 20 latency is the time it takes for the beginning of the required sector to reach the head. Sum of seek time if any and latency is the access time.

Time taken to actually transfer a span of data is transfer time. Questions Describe the Buddy system of memory allocation. When some memory is required by a process, the block size of next higher order is chosen, and broken into two. Note that the two such pieces differ in address only in their kth bit.

Such pieces are called buddies. When any used block is freed, the OS checks to see if its buddy is also free.

Operating System Interview Question

If so, it is rejoined, and put into the original free-block linked-list. Questions What is time-stamping? This scheme is intended to order events consisting of the transmission of messages. Each system 'i' in the network maintains a counter C i.

Every time a system transmits a message, it increments its counter by 1 and attaches the time-stamp Ti to the message. When a message is received, the receiving system 'j' sets its counter C j to 1 more than the maximum of its current value and the incoming time-stamp Ti. At each site, the ordering of messages is determined by the following rules: For messages x from site i and y from site j, x precedes y if one of the following conditions holds So this allows easier program design.

Answer : An assembler acts as a translator for low level language. Assembly codes, written using mnemonic commands are translated by the Assembler into machine language. What Are Interrupts? Answer : Interrupts are part of a hardware mechanism that sends a notification to the CPU when it wants to gain access to a particular resource. What Is Gui?

Operating System Interview Questions & Answers

It provides users with an interface wherein actions can be performed by interacting with icons and graphical symbols. People find it easier to interact with the computer when in a GUI especially when using the mouse.

Instead of having to remember and type commands, users just click on buttons to perform a process. What Is Preemptive Multitasking? Answer : Preemptive multitasking allows an operating system to switch between software programs.

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