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- A cache memory is usually much efficient because of its high access speed. What Is Spooling? Answer : Spooling is normally associated with printing. When different applications want to send an output to the printer at the same time, spooling takes...
- 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 :...
- This common OS Developer interview questions guide will help you clear the interview and help you get your dream job. Operating systems exist for two main purposes. One is that it is designed to make sure a computer system performs well by managing its computational activities. Another is that it provides an environment for the development and execution of programs. With an increased number of processors, there is a considerable increase in throughput. It can also save more money because they can share resources.
Operating System Mcq Questions With Answer | OS Question | Computer Fundamental
Finally, overall reliability is increased as well. A kernel is the core of every operating system. It connects applications to the actual processing of data. It also manages all communications between software and hardware components to ensure usability and reliability. Real-time systems are used when rigid time requirements have been placed on the operation of a processor. It has well defined and fixed time constraints. Virtual memory is a memory management technique for letting processes execute outside of memory. This is very useful especially is an executing program cannot fit in the physical memory. The main objective of multiprogramming is to have a process running at all times. With this design, CPU utilization is said to be maximized. In a Time-sharing system, the CPU executes multiple jobs by switching among them, also known as multitasking.- This process happens so fast that users can interact with each program while it is running. It is the most common type of multiple-processor systems. In this system, each processor runs an identical copy of the operating system, and these copies communicate with one another as needed. Server systems can be classified as either computer-server systems or file server systems.
- In the first case, an interface is made available for clients to send requests to perform an action. In the second case, provisions are available for clients to create, access and update files. In asymmetric clustering, a machine is in a state known as hot standby mode where it does nothing but to monitor the active server. A thread is a basic unit of CPU utilization. In general, a thread is composed of a thread ID, program counter, register set, and the stack.
- FCFS stands for First-come, first-served. It is one type of scheduling algorithm. Implementation is managed by a FIFO queue. RR round-robin scheduling algorithm is primarily aimed for time-sharing systems. A circular queue is a setup in such a way that the CPU scheduler goes around that queue, allocating CPU to each process for a time interval of up to around 10 to milliseconds.
- Deadlock situations occur when four conditions occur simultaneously in a system: Mutual exclusion; Hold and Wait; No preemption; and Circular wait. It gets its name from a banking system wherein the bank never allocates available cash in such a way that it can no longer satisfy the needs of all of its customers. One is that it depends on how often a deadlock is likely to occur under the implementation of this algorithm. The other has to do with how many processes will be affected by deadlock when this algorithm is applied. Logical address refers to the address that is generated by the CPU. On the other hand, physical address refers to the address that is seen by the memory unit. With dynamic loading, a routine is not loaded until it is called.
- This method is especially useful when large amounts of code are needed in order to handle infrequently occurring cases such as error routines. Overlays are used to enable a process to be larger than the amount of memory allocated to it. The basic idea of this is that only instructions and data that are needed at any given time are kept in memory. Paging is a memory management scheme that permits the physical address space of a process to be noncontiguous. It avoids the considerable problem of having to fit varied sized memory chunks onto the backing store. Fragmentation is memory wasted. It can be internal if we are dealing with systems that have fixed-sized allocation units, or external if we are dealing with systems that have variable-sized allocation units. During regular intervals that are set by the operating system, processes can be copied from main memory to a backing store, and then copied back later.
- Swapping allows more operations to be run that can fit into memory at one time. A socket provides a connection between two applications. Each endpoint of a communication is a socket. Direct Access method is based on a disk model of a file, such that it is viewed as a numbered sequence of blocks or records. It allows arbitrary blocks to be read or written. Direct access is advantageous when accessing large amounts of information. Thrashing refers to an instance of high paging activity. This happens when it is spending more time paging instead of executing. The best paging size varies from system to system, so there is no single best when it comes to page size.
- There are different factors to consider in order to come up with a suitable page size, such as page table, paging time, and its effect on the overall efficiency of the operating system. Typically, the different attributes for a file structure are naming, identifier, supported file types, and location for the files, size, and level of protection. Root partition is where the operating system kernel is located. It also contains other potentially important system files that are mounted during boot time. This prevents conflicts whenever such devices are incorporated in a systems unit. It is based on a file-representation structure known as vnode, which contains a numerical designator needed to support network file systems.
90 Operating System Interview Questions And Answers - Freshers, Experienced
What are the different types of operating systems? Answer: There are five types of operating systems: Batch operating system All jobs are submitted at once and are executed in a particular order with any preemption, which means that no jobs can be taken unless these complete. Multiprogramming operating system This acts to be an extension of Batch OS, where main memory can have several jobs at once, and they would be executed in a particular order at a particular time. Multi-tasking operating system This operating system enables the user to execute multiple tasks on a single processor simultaneously. The CPU, in this case, switches processes at a very fast pace and does it parallel. Multi-processing operating system It is the ability where a user can execute multiple processes simultaneously on a multi-processor system.- This utilizes more than one CPU at a time. Real-time operating system Here a specified time is allotted for each job, and it is usually a critical application pertaining to military operations, satellites, etc. Explain the different kinds of a kernel. Answer: We have three important types of the kernel named: Monolithic Kernel: It can be considered a whole kernel full-fledged kernel, which provides all the services are running. Example: Microsoft NT kernel 6. Explain the different sections of the process. Answer: There are mainly four sections in a process. They are as below: Stack: contains local variables, returns address Heap: Dynamically allocated memory via malloc, calloc,realloc Data: contains global and static variables. Note: Stack and the Heap section are extendible; that is, the stack can grow down, and the heap can grow up. It is in the same order as mentioned above. What are the different types of scheduling algorithms? Round Robin RR : Each process is given a quantum amount of time Shortest job first SJF : Process with lowest execution time is given first preference Priority scheduling ps : A priority value called nice value is used for selecting process.
- Its value is from 0 to List the different performance metrics for the scheduler. Wait Time: This is the time that a process spends for its turn to get executed. Response Time: This is the time elapsed from when a process is submitted until a useful output is obtained. Turnaround Time: This is considered to be the time elapsed from when a process is submitted to when it has completed. What is the Zombie process? Answer: A zombie process is a process that has completed and in the terminated state but has its entry in the process table. It shows that the resources are held by the process and are not free. What is thrashing? Answer: Thrashing occurs when the processor is spending most of its time in swapping pages instead of executing the instructions. Here we have listed the most useful 10 interview sets of questions so that the jobseeker can crack the interview with ease.
- Linus Torvalds created the Linux kernel in the early '90s and in the early 21st century his creation can be found in the majority of tech productsdominating most markets except the desktop computer. Question by author CollinBlatt. Answer: F5 Not only can you use F5 to refresh a web page, you can use it to refresh any active window on your desktop. From Quiz: Take the Shortcut click to play it. Question by author vhebert Answer: Longhorn Vista's codename, believe it or not, was Longhorn. The name Vista was announced on July 22, , along with the rest of the system. Question by author VmKid. Assuming that your current working directory does not have a file named "God", how will CSH respond to you issuing the command "rm God"?
- Answer: rm: God non-existent An unexpected theological statement from a mere piece of software! A shell is a command line interpreter which presents its user with an easy-to-learn easy-to-use interface with the underlying Unix kernel. Important to note that all the "jokes" I am presenting in this quiz have been successfully tested on the CSH which is included in the HPUX11 distribution. In other words, although it may not always seem so, these are for real. Question by author gentlegiant Answer: Shows the Start Menu Although it is possible to shut down the computer or log off from the Start Menu, this command does not directly perform those actions.
- From Quiz: Keyboard Commands click to play it. Question by author clayfrd. System Restore allows you to set your computer back to an earlier date without deleting anything. From Quiz: Open Windows click to play it. Question by author paulbrec. According to everyone else, any of the other definitions can apply. From Quiz: Windows XP click to play it. Question by author Polaris Answer: Nothing at all. Linux is an open-source programme. Many nice people spent their own time and money developing it.
Operating System (OS) MCQ : Multiple Choice Questions And Answers
You can download it free of charge on www. Some versions of Linux do cost money. From Quiz: Linux click to play it. Question by author tiffanysgal.- Operating systems exist for two main purposes. One is that it is designed to make sure a computer system performs well by managing its computational activities. Another is that it provides an environment for the development and execution of programs. With an increased number of processors, there is a considerable increase in throughput. It can also save more money because they can share resources. Finally, overall reliability is increased as well. A kernel is the core of every operating system. It connects applications to the actual processing of data. It also manages all communications between software and hardware components to ensure usability and reliability. Real-time systems are used when rigid time requirements have been placed on the operation of a processor. It has well defined and fixed time constraints. Virtual memory is a memory management technique for letting processes execute outside of memory.
- This is very useful especially is an executing program cannot fit in the physical memory. The main objective of multiprogramming is to have a process running at all times. With this design, CPU utilization is said to be maximized. In a Time-sharing system, the CPU executes multiple jobs by switching among them, also known as multitasking. This process happens so fast that users can interact with each program while it is running. It is the most common type of multiple-processor systems. In this system, each processor runs an identical copy of the operating system, and these copies communicate with one another as needed.
76 Operating System Quizzes Online, Trivia, Questions & Answers - ProProfs Quizzes
Server systems can be classified as either computer-server systems or file server systems. In the first case, an interface is made available for clients to send requests to perform an action. In the second case, provisions are available for clients to create, access and update files. In asymmetric clustering, a machine is in a state known as hot standby mode where it does nothing but to monitor the active server.5 Common Operating System Interview Questions (With Example Answers)
A thread is a basic unit of CPU utilization. In general, a thread is composed of a thread ID, program counter, register set, and the stack. FCFS stands for First-come, first-served. It is one type of scheduling algorithm. Implementation is managed by a FIFO queue. RR round-robin scheduling algorithm is primarily aimed for time-sharing systems. A circular queue is a setup in such a way that the CPU scheduler goes around that queue, allocating CPU to each process for a time interval of up to around 10 to milliseconds. Deadlock situations occur when four conditions occur simultaneously in a system: Mutual exclusion; Hold and Wait; No preemption; and Circular wait. It gets its name from a banking system wherein the bank never allocates available cash in such a way that it can no longer satisfy the needs of all of its customers. One is that it depends on how often a deadlock is likely to occur under the implementation of this algorithm.- The other has to do with how many processes will be affected by deadlock when this algorithm is applied. Logical address refers to the address that is generated by the CPU. On the other hand, physical address refers to the address that is seen by the memory unit. With dynamic loading, a routine is not loaded until it is called. This method is especially useful when large amounts of code are needed in order to handle infrequently occurring cases such as error routines. Overlays are used to enable a process to be larger than the amount of memory allocated to it. The basic idea of this is that only instructions and data that are needed at any given time are kept in memory.
- Paging is a memory management scheme that permits the physical address space of a process to be noncontiguous. It avoids the considerable problem of having to fit varied sized memory chunks onto the backing store. Fragmentation is memory wasted. It can be internal if we are dealing with systems that have fixed-sized allocation units, or external if we are dealing with systems that have variable-sized allocation units. During regular intervals that are set by the operating system, processes can be copied from main memory to a backing store, and then copied back later.
Top 10 Useful Operating System Interview Questions And Answers In
Swapping allows more operations to be run that can fit into memory at one time. A socket provides a connection between two applications. Each endpoint of a communication is a socket. Direct Access method is based on a disk model of a file, such that it is viewed as a numbered sequence of blocks or records. It allows arbitrary blocks to be read or written. Direct access is advantageous when accessing large amounts of information. Thrashing refers to an instance of high paging activity. This happens when it is spending more time paging instead of executing. The best paging size varies from system to system, so there is no single best when it comes to page size. There are different factors to consider in order to come up with a suitable page size, such as page table, paging time, and its effect on the overall efficiency of the operating system. Typically, the different attributes for a file structure are naming, identifier, supported file types, and location for the files, size, and level of protection.- Root partition is where the operating system kernel is located. It also contains other potentially important system files that are mounted during boot time. This prevents conflicts whenever such devices are incorporated in a systems unit. It is based on a file-representation structure known as vnode, which contains a numerical designator needed to support network file systems.
Top 70+ Operating System Interview Questions And Answers 2021 [Updated]
Operating System Interview Question and Answers 1. What is an operating system? An operating system is a program that acts as an intermediary between the user and the computer hardware. The purpose of an OS is to provide a convenient environment in which user can execute programs in a convenient and efficient manner. It is a resource allocator responsible for allocating system resources and a control program which controls the operation of the computer hardware. Why paging is used? Paging is solution to external fragmentation problem which is to permit the logical address space of a process to be noncontiguous, thus allowing a process to be allocating physical memory wherever the latter is available.- Explain the concept of the batched operating systems? In batched operating system the users gives their jobs to the operator who sorts the programs according to their requirements and executes them. This is time consuming but makes the CPU busy all the time. What is purpose of different operating systems? 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.
- Explain the abstract view of the components of a computer system. OR Write different services provided by operating system. Question-1 What is operating System? An operating system OS is a collection of software that manages computer hardware resources and provides various services for computer programs. It acts as an intermediary between the user of a computer and the computer hardware. On the top of the hardware is the software. Operating system runs on the bare hardware and it provides base for the rest of the software. Most computers have two modes of operation: kernel mode and user mode. The operating system is the most fundamental piece of software and runs in kernel mode. In this mode it has complete access to all the hardware and can execute any instruction that the machine is capable of executing. The rest of the software runs in user mode, in which only a subset of the machine instructions is available.
- Here we find the command interpreter shell , compilers, editors, and other system programs. Finally, above the system programs are the application programs. These programs arepurchased or written by the users to solve their particular problems, such as word processing, spreadsheets, web browser or music player. To hide complexity of hardware, an operating system is provided. It consists of a layer of software that partially hides the hardware and gives the programmer a more convenient set of instructions to work with. Question-2 Give the view of OS as an extended machine.
- Operating systems perform two basically unrelated functions: providing a clean abstract set of resources instead of the messy hardware to application programmers and managing these hardware resources. Users do not want to be involved in programming of storage devices. Operating System provides a simple, high level abstraction such that these devices contain a collection of named files. Such files consist of useful piece of information like a digital photo, e mail messages, or web page. Operating System provides a set of basic commands or instructions to perform various operations such as read, write, modify, save or close.
Operating System Mcq Questions With Answer | OS Question | Computer Fundamental
Dealing with them is easier than directly dealing with hardware. Thus, Operating System hides the complexity of hardware and presents a beautiful interface to the users. Just as the operating system shields protect from an unpleasant experience the programmer from the disk hardware and presents a simple file-oriented interface, it also conceals a lot of unpleasant business concerning interrupts, timers, memory management, and other low level features. In each case, the abstraction offered by the operating system is simpler and easier to use than that offered by the underlying hardware. In this view, the function of the operating system is to present the user with the equivalent of an extended machine or virtual machine that is easier to work with than the underlying hardware. The operating system provides a variety of services that programs can obtain using special instructions called system calls.
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