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Computer Aptitude

OPERATING SYSTEM MCQs

Total Questions : 814 | Page 3 of 82 pages
Question 21.

A(n) ....... is a set of programs designed to manage the resources of a computer including starting the computer, managing programs and coordinating tasks between input and output devices.

  1.    application suite
  2.    compiler
  3.    input/output system
  4.    operating system
  5.    None of these
 Discuss Question
Answer: Option D. -> operating system
Question 22. Of the following which is the methods for allocating disks
  1.    Contiguous
  2.    Linked
  3.    Indexed
  4.    All of the above
 Discuss Question
Answer: Option B. -> Linked
Answer: (b)
Question 23. The page table that is maintained by operating system
  1.    Shows frame location for each page of the process
  2.    Shows actual address in main memory
  3.    Referrer memory location to memory
  4.    None of these.
 Discuss Question
Answer: Option A. -> Shows frame location for each page of the process
Answer: (a)
Question 24. Semaphores
  1.    are used to do I/O
  2.    Synchronize critical resources to prevent contention
  3.    synchronize critical resources to prevent deadlock.
  4.    allow processes to communicate with one another.
 Discuss Question
Answer: Option C. -> synchronize critical resources to prevent deadlock.
Answer: (c)
Question 25. In the following processes: a = a + 1; b = 2 × b; b = b + 1; a = 2 × a; the output is.
  1.    a > b
  2.    a < b
  3.    a = b
  4.    None of these.
 Discuss Question
Answer: Option D. -> None of these.
Answer: (d)
Question 26. In memory management :A-Fixed allocation policy, B-Variable allocation policy: 1-It gives a process a fixed number of frames in main memory within which to execute. 2-It allows the number of page frames allocated to a process to be varied over the life time of the process. 3-In it a number of allocated frames are decided at initial load time.
  1.    A - 1, 3, B - 2
  2.    A - 1, B - 3
  3.    A - 2, B - 1, 3
  4.    A - 1, 2, B - 3
 Discuss Question
Answer: Option A. -> A - 1, 3, B - 2
Answer: (a)
Question 27. The Least Recently Used (LRU) policy
  1.    Replaces the page in memory that has not been referenced for the least time.
  2.    Replaces the page in memory that has not been referenced for the longest time.
  3.    Replaces the page in memory in round robin fashion.
  4.    None of these.
 Discuss Question
Answer: Option B. -> Replaces the page in memory that has not been referenced for the longest time.
Answer: (b)
Question 28. Memory that is located on the disk either Hard or floppy is referred as
  1.    Virtual memory
  2.    Real memory
  3.    Main memory
  4.    None of these.
 Discuss Question
Answer: Option A. -> Virtual memory
Answer: (a)
Question 29. Program counter (PC) contains
  1.    Address of an instruction to be fetched
  2.    Instructions most recently fetched
  3.    Data to be written into memory
  4.    Data to be read from memory
 Discuss Question
Answer: Option A. -> Address of an instruction to be fetched
Answer: (a)
Question 30. In multi processor scheduling, independent parallelism indicates
  1.    There is synchronization among processes at gross level.
  2.    There is no explicit synchronization among processes.
  3.    A parallel processing or multi tasking is done within a single application.
  4.    None of these.
 Discuss Question
Answer: Option B. -> There is no explicit synchronization among processes.
Answer: (b)

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