Operating System

1. Which of the following is NOT a memory management technique used by operating systems? BPSC TRE 4 operating system practice set 1 2. Which of the following is a file system commonly used in operating systems? BPSC TRE 4 operating system practice set 1 3. Which of the following is NOT a type of interrupt? BPSC TRE 4 operating system practice set 1 4. What is a page in paging? BPSC TRE 4 operating system practice set 1 5. In a system with a page size of 4 KB and a physical address space of 64 GB, what is the number of bits required for the page offset? BPSC TRE 4 operating system practice set 1 6. What is a segment base in segmentation? BPSC TRE 4 operating system practice set 1 7. What causes thrashing to occur? BPSC TRE 4 operating system practice set 1 8. Consider a system with a total physical memory of 8 GB and total virtual memory of 16 GB. If the system is using 6 GB of physical memory and 10 GB of virtual memory, how much memory is being swapped out? BPSC TRE 4 operating system practice set 1 9. How is the TLB typically organized? BPSC TRE 4 operating system practice set 1 10. Which of the following is a common file operation? BPSC TRE 4 operating system practice set 1 11. Consider a disk queue with requests for I/O to blocks on cylinders 98, 183, 37, 122, 14, 124, 65, 67. Considering FCFS (First Come First Served) scheduling, the total number of head movements is, if the disk head is initially at 53? BPSC TRE 4 operating system practice set 1 12. Thread shares with other threads belonging to the same process its BPSC TRE 4 operating system practice set 1 13. Which type of operating system is designed to respond to events within a specified time limit? BPSC TRE 4 operating system practice set 1 14. In paging, a process is divided into fixed-size units called: BPSC TRE 4 operating system practice set 1 15. Which file system is commonly associated with modern Microsoft Windows systems? BPSC TRE 4 operating system practice set 1 16. Which type of interrupt is generated by an external hardware device? BPSC TRE 4 operating system practice set 1 17. What is a frame in a paging system? BPSC TRE 4 operating system practice set 1 18. If the page size is 8 KB, how many bits are required for the page offset? BPSC TRE 4 operating system practice set 1 19. What does the segment limit specify in a segmentation system? BPSC TRE 4 operating system practice set 1 20. Which of the following is a major cause of thrashing? BPSC TRE 4 operating system practice set 1 21. A computer has 12 GB of physical memory and 18 GB of virtual memory in use. If 10 GB of physical memory is currently occupied, how much virtual memory is outside physical memory under the simplified model? BPSC TRE 4 operating system practice set 1 22. What is the primary purpose of a Translation Lookaside Buffer (TLB)? BPSC TRE 4 operating system practice set 1 23. Which operation is used to open an existing file for access? BPSC TRE 4 operating system practice set 1 24. Consider the disk request queue 82, 170, 43, 140, 24, 16, 190 with the initial head position at 50. What is the total head movement using FCFS scheduling? BPSC TRE 4 operating system practice set 1 25. Which of the following is private to each thread in a process? BPSC TRE 4 operating system practice set 1 26. Which operating system is specifically designed to control and manage a dedicated device? BPSC TRE 4 operating system practice set 1 27. In paging, physical memory is divided into fixed-size units called: BPSC TRE 4 operating system practice set 1 28. Which file system is commonly used by Linux distributions? BPSC TRE 4 operating system practice set 1 29. Which type of interrupt is generated by the execution of a special instruction or software condition? BPSC TRE 4 operating system practice set 1 30. What is the primary purpose of a page table? BPSC TRE 4 operating system practice set 1 31. If a paging system uses a page size of 1 KB, how many bits are required for the page offset? BPSC TRE 4 operating system practice set 1 32. Which two values are primarily stored in each segment-table entry? BPSC TRE 4 operating system practice set 1 33. Which of the following is a characteristic symptom of thrashing? BPSC TRE 4 operating system practice set 1 34. A system has 16 GB of physical memory and 24 GB of virtual memory in use. If 14 GB of physical memory is currently occupied, how much virtual memory is outside physical memory under the simplified model? BPSC TRE 4 operating system practice set 1 35. What information is primarily stored in a TLB entry? BPSC TRE 4 operating system practice set 1 36. Which operation is used to retrieve data from an existing file? BPSC TRE 4 operating system practice set 1 37. In FCFS disk scheduling, how are disk I/O requests serviced? BPSC TRE 4 operating system practice set 1 38. Which of the following is generally shared by threads belonging to the same process? BPSC TRE 4 operating system practice set 1 39. Which type of operating system allows multiple users to access computer resources simultaneously? BPSC TRE 4 operating system practice set 1 40. Which memory management technique divides a program into variable-sized logical units such as code, data and stack? BPSC TRE 4 operating system practice set 1 41. Which file system was developed by Apple for use with older versions of Mac OS and macOS? BPSC TRE 4 operating system practice set 1 42. What is the name of the routine executed by the CPU to handle an interrupt? BPSC TRE 4 operating system practice set 1 43. Which of the following is true about the size of a page and a frame in paging? BPSC TRE 4 operating system practice set 1 44. A paging system has a page size of 16 KB. What is the number of bits in the page offset? BPSC TRE 4 operating system practice set 1 45. How is the physical address obtained in basic segmentation when the offset is valid? BPSC TRE 4 operating system practice set 1 46. What happens to CPU utilization during severe thrashing? BPSC TRE 4 operating system practice set 1 47. A system uses 20 GB of virtual memory and 12 GB of physical memory. If 9 GB of physical memory is currently in use, how much virtual memory is outside physical memory under the simplified model? BPSC TRE 4 operating system practice set 1 48. What happens when a required page-number translation is found in the TLB? BPSC TRE 4 operating system practice set 1 49. Which operation is used to store data into a file? BPSC TRE 4 operating system practice set 1 50. A disk head is initially at cylinder 40. The FCFS request sequence is 10, 50, 20. What is the total head movement? BPSC TRE 4 operating system practice set 1 51. Which of the following is normally private to an individual thread? BPSC TRE 4 operating system practice set 1 52. Which operating system is mainly designed to execute jobs in groups without requiring direct user interaction during execution? BPSC TRE 4 operating system practice set 1 53. Which type of fragmentation is commonly associated with paging? BPSC TRE 4 operating system practice set 1 54. Which of the following file systems supports journaling? BPSC TRE 4 operating system practice set 1 55. Which type of interrupt can normally be disabled or ignored temporarily by the CPU? BPSC TRE 4 operating system practice set 1 56. What is a page fault? BPSC TRE 4 operating system practice set 1 57. A system has a physical address space of 32 GB and a page size of 4 KB. How many bits are required for a physical address? BPSC TRE 4 operating system practice set 1 58. A segment has a base address of 5000 and an offset of 300. What physical address is generated, assuming the offset is within the segment limit? BPSC TRE 4 operating system practice set 1 59. Which technique can help reduce thrashing by ensuring that processes receive enough frames for their active pages? BPSC TRE 4 operating system practice set 1 60. What is the main purpose of swap space in a virtual memory system? BPSC TRE 4 operating system practice set 1 61. What happens when a required page-number translation is not found in the TLB? BPSC TRE 4 operating system practice set 1 62. Which operation removes a file from the file system? BPSC TRE 4 operating system practice set 1 63. Which disk scheduling algorithm selects the pending request with the shortest seek distance from the current head position? BPSC TRE 4 operating system practice set 1 64. Which memory area is commonly shared among threads of the same process? BPSC TRE 4 operating system practice set 1 65. Which type of operating system provides users with the ability to interact with the system while programs are executing and shares CPU time among users or processes? BPSC TRE 4 operating system practice set 1 66. Which type of fragmentation is primarily associated with variable-sized memory allocation and segmentation? BPSC TRE 4 operating system practice set 1 67. Which file system is known for having a maximum individual file size of approximately 4 GB? BPSC TRE 4 operating system practice set 1 68. Which interrupt is designed for conditions that require immediate attention and normally cannot be disabled by the usual interrupt mask? BPSC TRE 4 operating system practice set 1 69. Which hardware component is commonly used to speed up virtual-to-physical address translation? BPSC TRE 4 operating system practice set 1 70. A system has a physical memory size of 16 GB and a page size of 4 KB. How many physical memory frames are available? BPSC TRE 4 operating system practice set 1 71. A segment has a base address of 8000 and a limit of 1000. Which offset is valid for accessing the segment? BPSC TRE 4 operating system practice set 1 72. Which action can help control thrashing when the degree of multiprogramming is too high? BPSC TRE 4 operating system practice set 1 73. When physical memory becomes insufficient for the current memory demand, which operation may occur? BPSC TRE 4 operating system practice set 1 74. Which component normally contains the page table in a virtual memory system? BPSC TRE 4 operating system practice set 1 75. Which operation changes the name of an existing file without being a read or write operation? BPSC TRE 4 operating system practice set 1 76. A disk head is initially at cylinder 50. The FCFS request sequence is 60, 90, 30, 20. What is the total head movement? BPSC TRE 4 operating system practice set 1 77. Which of the following is NOT normally shared among threads of the same process? BPSC TRE 4 operating system practice set 1 78. Which type of operating system is designed to manage resources across multiple interconnected computers and make them work together? BPSC TRE 4 operating system practice set 1 79. Which technique allows a program to execute even when the entire program cannot fit into physical main memory at once? BPSC TRE 4 operating system practice set 1 80. Which of the following is the modern default file system introduced by Apple for macOS, iOS and related platforms? BPSC TRE 4 operating system practice set 1 81. Which hardware component commonly generates periodic interrupts used by an operating system for timekeeping and scheduling? BPSC TRE 4 operating system practice set 1 82. Which technique loads a page into physical memory only when the page is actually needed? BPSC TRE 4 operating system practice set 1 83. A logical address is 32 bits long and the page size is 4 KB. How many bits are used for the page number? BPSC TRE 4 operating system practice set 1 84. Which register points to the location of the segment table in memory? BPSC TRE 4 operating system practice set 1 85. Which of the following is most directly associated with thrashing? BPSC TRE 4 operating system practice set 1 86. If a system has 8 GB of physical memory and 12 GB of virtual memory in use, with 8 GB of physical memory occupied, how much virtual memory is outside physical memory under the simplified model? BPSC TRE 4 operating system practice set 1 87. If a system has a TLB hit ratio of 80%, what percentage of address translations result in a TLB miss? BPSC TRE 4 operating system practice set 1 88. Which of the following are standard file-system operations? BPSC TRE 4 operating system practice set 1 89. Which disk scheduling algorithm moves the disk head toward one end while servicing requests in that direction and then reverses direction? BPSC TRE 4 operating system practice set 1 90. Which of the following is a characteristic of threads belonging to the same process? BPSC TRE 4 operating system practice set 1 91. Which type of operating system is commonly used to manage computers connected to a network and provide services such as file and printer sharing? BPSC TRE 4 operating system practice set 1 92. Which of the following is a page replacement algorithm used in virtual memory systems? BPSC TRE 4 operating system practice set 1 93. Which component of a file system keeps information about files and their locations on storage? BPSC TRE 4 operating system practice set 1 94. What generally happens when the CPU accepts an interrupt? BPSC TRE 4 operating system practice set 1 95. Which of the following is a common page replacement algorithm? BPSC TRE 4 operating system practice set 1 96. A system has a 36-bit physical address and a page size of 4 KB. How many bits are required for the physical frame number? BPSC TRE 4 operating system practice set 1 97. What happens if the offset in a logical address is greater than or equal to the permitted segment limit? BPSC TRE 4 operating system practice set 1 98. What is the primary effect of thrashing on system performance? BPSC TRE 4 operating system practice set 1 99. Which statement best describes the relationship between physical and virtual memory in a system using paging? BPSC TRE 4 operating system practice set 1 100. Which statement about a TLB is correct? BPSC TRE 4 operating system practice set 1 101. Which operation releases an open file so that the process no longer has it open? BPSC TRE 4 operating system practice set 1 102. A disk head is initially at cylinder 100. The FCFS request sequence is 55, 20, 80. What is the total head movement? BPSC TRE 4 operating system practice set 1 103. Which of the following is an advantage of multithreading within a process? BPSC TRE 4 operating system practice set 1 104. Which of the following is an example of an operating system used in mobile devices? BPSC TRE 4 operating system practice set 1 105. Which operating system characteristic allows several programs to be kept in memory and executed by the CPU concurrently? BPSC TRE 4 operating system practice set 1 106. Which of the following is NOT an operating system? BPSC TRE 4 operating system practice set 1