Operating Systems Overview
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Questions and Answers

What is defined as the basic unit of work in a system?

  • Function
  • Process (correct)
  • Program
  • Thread

    • Which of the following states indicates that a process is currently being executed?

  • New
  • Ready
  • Terminated
  • Running (correct)

    • What does a program represent compared to a process?

  • A sequence of events
  • A static entity (correct)
  • A dynamic entity
  • An executing code

    • What happens to a process in the 'Waiting' state?

    <p>It is waiting for some event to occur.</p> Signup and view all the answers

    What does a Process Control Block (PCB) represent?

    <p>A data structure for the operating system.</p> Signup and view all the answers

    Which of the following is NOT a component of a process?

    <p>Handler</p> Signup and view all the answers

    How many states can a process have at one time?

    <p>Five</p> Signup and view all the answers

    What is required for a process to run to completion?

    <p>All requested resources must be allocated.</p> Signup and view all the answers

    What is the average wait time for processes in the first scheduling method discussed?

    <p>5.0</p> Signup and view all the answers

    In priority based scheduling, how are processes with the same priority executed?

    <p>On a first come first serve basis</p> Signup and view all the answers

    What technique is used in Round Robin scheduling to manage process execution?

    <p>Context switching</p> Signup and view all the answers

    How is the wait time for process P3 calculated in Round Robin scheduling?

    <p>(9-3) + (18-12)</p> Signup and view all the answers

    What is a characteristic of Multi Queue Scheduling?

    <p>Priorities can be assigned to each queue</p> Signup and view all the answers

    What would be the average wait time for the processes in the second scheduling example?

    <p>5.25</p> Signup and view all the answers

    Which scheduling method provides each process a fixed time to execute?

    <p>Round Robin Scheduling</p> Signup and view all the answers

    What defines the priority of a process in priority based scheduling?

    <p>Resource requirements</p> Signup and view all the answers

    What is external fragmentation?

    <p>Memory is enough but not contiguous for process allocation.</p> Signup and view all the answers

    Which of the following techniques can reduce external fragmentation?

    <p>Compaction</p> Signup and view all the answers

    What is the primary role of device drivers in an operating system?

    <p>To hide the complexities of hardware devices from users</p> Signup and view all the answers

    How does paging avoid external fragmentation?

    <p>By breaking physical memory into fixed-size pages.</p> Signup and view all the answers

    What is the purpose of the page number in the paging technique?

    <p>To index into a page table to find the base address.</p> Signup and view all the answers

    Which of the following is not a property associated with storage media?

    <p>Color</p> Signup and view all the answers

    What differentiates segmentation from paging?

    <p>Paging consists of fixed-size blocks, while segmentation uses logical pieces of varying sizes.</p> Signup and view all the answers

    What type of file permission allows a program to modify a file?

    <p>Read-write</p> Signup and view all the answers

    What is the role of page offset in the paging process?

    <p>To find the exact location within a specific page.</p> Signup and view all the answers

    How does the operating system assist in file system management?

    <p>By allowing users to create and delete directories</p> Signup and view all the answers

    Which statement accurately represents internal fragmentation?

    <p>Excess memory is left unused due to larger block allocations than necessary.</p> Signup and view all the answers

    In a distributed system, how does the operating system manage communication?

    <p>Through managing routing and connection strategies</p> Signup and view all the answers

    Which of the following is TRUE about segmentation?

    <p>Segmentation can be implemented without paging.</p> Signup and view all the answers

    When a program requests access to an I/O device, what does the operating system do?

    <p>Provides access if the device is available</p> Signup and view all the answers

    What characterizes a collection of processors in a distributed system?

    <p>They do not share memory or peripheral devices.</p> Signup and view all the answers

    Which of the following activities is not typically handled by the operating system related to file management?

    <p>Encrypting all files automatically</p> Signup and view all the answers

    What is a primary advantage of user level threads?

    <p>Thread switching does not require kernel mode privileges.</p> Signup and view all the answers

    Which of the following best describes kernel level threads?

    <p>The kernel directly supports and manages all thread activities.</p> Signup and view all the answers

    What is a disadvantage of user level threads?

    <p>Most system calls are blocking in typical operating systems.</p> Signup and view all the answers

    How does the kernel benefit from its management of threads?

    <p>If one thread is blocked, the kernel can schedule another from the same process.</p> Signup and view all the answers

    Which statement regarding user level threads is false?

    <p>They require management code within the application area.</p> Signup and view all the answers

    What is the typical performance difference between user level threads and kernel level threads?

    <p>User level threads are generally faster to create and manage than kernel threads.</p> Signup and view all the answers

    What is a limitation of kernel level threads?

    <p>They are generally slower to create and manage than user threads.</p> Signup and view all the answers

    Which of the following is NOT an advantage of user level threads?

    <p>They can efficiently utilize multiple cores for processing.</p> Signup and view all the answers

    What is a notable disadvantage of the many to one threading model?

    <p>Only one thread can access the Kernel at a time.</p> Signup and view all the answers

    Which threading model utilizes multiple user-level threads mapped to a smaller or equal number of Kernel threads?

    <p>Many to Many model</p> Signup and view all the answers

    Which operating systems are known for using the one to one threading model?

    <p>OS/2, Windows NT, and Windows 2000</p> Signup and view all the answers

    In the context of multithreading, what is a kernel mode switch?

    <p>The transfer of control from one thread to another within the same process.</p> Signup and view all the answers

    How does the many to many threading model handle blocking system calls?

    <p>The blocking does not affect all threads in the process.</p> Signup and view all the answers

    Which characteristic is true regarding the one to one threading model?

    <p>It requires a corresponding kernel thread for every user thread.</p> Signup and view all the answers

    What is the main advantage of the many to many multithreading model?

    <p>Enables scalability across multiple processors.</p> Signup and view all the answers

    In which threading model does a blocking system call cause the entire process to block?

    <p>Many to One model</p> Signup and view all the answers

    Study Notes

    Table of Contents

    • Operating System Teaching Material, prepared by Mr. Shambel Dechasa
    • Table of Contents (page i)
    • Chapter 1: Overview of Operating Systems (page 1)
    • Chapter 2: Types of Operating Systems (page 3)
    • Chapter 3: Operating System Services (page 5)
    • Chapter 4: Operating System Properties (page 8)
    • Chapter 5: Operating System Processes (page 12)
    • Chapter 6: Operating System Process Scheduling (page 14)
    • Chapter 7: Process Scheduling Algorithms (page 19)
    • Chapter 8: Operating System Multi-Threading (page 23)
    • Chapter 9: Memory Management (page 27)
    • Chapter 10: Virtual Memory (page 33)
    • Chapter 11: I/O Hardware (page 39)
    • Chapter 12: I/O Software (page 45).
    • Chapter 13: File System (page 48)
    • Chapter 14: Operating System Security (page 50)
    • Chapter 15: Linux Operating System (page 53)

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    Operating Systems Teaching Material PDF

    Description

    This quiz covers essential concepts from the Operating Systems course, focusing on various types of operating systems, their properties, services, and specific components like process scheduling and memory management. Prepare to test your knowledge on key aspects of operating systems, including Linux. Challenge yourself to master these foundational topics!

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