• What is OS? : It allows interaction between the computer user and computer hardware. It also controls the execution of programs. Its role likes: file, memory and process management, handling input and output and controlling devices. There are three main types of operating systems: Microsoft Windows, Mac and Linux. 
  • What is Process? : A sequence of instructions that executed in the predefined order that means Program in executions. It is instance of the computer program that is being executed.
  • What is scheduling? : scheduling is the action of assigning resources to perform tasks.
  • What is File management in OS?: In OS the File Management is a software that handles or manages the files in computer software. It will manage individual and group files available in the computer system.
  • What is shell?: It is a one type of computer program called a command-line interpreter. So users can control their Linux and Unix operating systems with command-line interfaces.
  • What is object program? : Object Programs are programs in machine language form (0 or 1). Generally users write a program using high level languages or assembly languages. If program is written in high level language, then it is to get converted to machine executable form by using compiler.
  • FCFS implementation just like ____________  : FIFO queue.
  • FCFS stands for ___________ : First Come First Serve.
  • SJN stands for ____________ : Shortest Job Next
  • In Round Robin Algorithm, the time quantum (TQ) is fixed and then processes are scheduled such that no process get CPU time more than one TQ in one go. If TQ is too large, the response time of the processes is too much which may not be tolerated in interactive environment.
  • What is physical Memory? : Physical memory is also be known as random access memory (RAM). It's installed in your computer. It's the hardware component where your computer stores data that is actively being used or processed by the control processing unit (CPU). Think of it as your computer's short-term memory where tasks are carried out. It is a form of very fast, but volatile data storage. 
  • What is Virtual memory? : Virtual memory is stored on the hard drive and is used when the RAM is filled. Physical memory is limited to the size of the RAM chips installed in the computer. Virtual memory is limited by the size of the hard drive, so virtual memory has the capability for more storage.
  • What is paging? : Paging is a storage mechanism used to retrieve processes from the secondary storage into the main memory in the form of pages. In paging, the physical memory is divided into fixed-size blocks called page frames, which are the same size as the pages used by the process. The process’s logical address space is also divided into fixed-size blocks called pages, which are the same size as the page frames. The mapping between logical pages and physical page frames is maintained by the page table, which is used by the memory management unit to translate logical addresses into physical addresses. The page table maps each logical page number to a physical page frame number.
  • What is segmentation? : It is a technique of memory management in which every job gets divided into various blocks of varied sizes, known as segments.
  • In paging Logical address divided into _______ parts . List out it. : In Paging The logical address generated by the CPU is divided into two parts, a page number and an offset. – Page number (p) – used as an index into the page table which contains the frame number. From the frame number, the base address of the page in physical memory can be found.
  • In paging Physical address divided into _______ parts . List out it : Frame Number(f) - It is the number of bits required to represent a frame in the Physical Address Space. It is the location of the required page inside the Main Memory. Frame Offset(d) - It is the page size or the number of bits required to represent a word in a frame. It is equal to the Page Offset.
  • In segmentation Logical address divided into _______ parts . List out it. : Segment Number(s) - It is the number of bits required to represent a Segment. It is used as an index in the Segment Table.Segment Offset(d) - It is the number of bits required to represent the size of a Segment.