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Download in pdf on Operating System multiple choice questions(MCQs) and answers. These quiz objective questions are important for graduate, under-graduate & competitive examinations NIELIT, BCA, B.Sc. MCA, M.Sc(IT), BE, B.Tech, CCNA, MCSE etc.
(41)
Spatial locality refers to the problem that once a location is referenced
[A]
it Will referenced again
[B]
it will not be referenced again
[C]
a nearby location will be referenced soon
[D]
none of the above
Comment
(42)
Page fault occurs when
[A]
the page is in main memory
[B]
the page is not in main memory
[C]
one tries to divide a number by 0
[D]
the page is corrupted by application software
Comment
(43)
Determine the number of page faults when references to pages in the order - 1, 2, 4, 5, 2, 1, 2, 4. Assume that the main memory can accommodate 3 pages and the main memory already has the pages 1 and 2, with page 1 having been brought earlier than page 2, (Assume LRU algorithm is used)
[A]
3
[B]
5
[C]
4
[D]
none of the above
Comment
(44)
Which of the following are real-time systems?
[A]
An on-line railway reservation system
[B]
A process control system
[C]
Aircraft control system
[D]
Both (B) and (C)
Comment
(45)
Necessary conditions for deadlock are
[A]
Non-preemption and circular wait
[B]
Mutual exclusion and partial allocation
[C]
Both (a) and (b)
[D]
None of the above
Comment
(46)
At a particular time, the value of a counting semaphore is 10. It will become 7 after
[A]
3 V operations
[B]
3 P operations
[C]
13 P operations and 10 V operations
[D]
Both (B) and (C)
Comment
(47)
Mutual exclusion problem occurs
[A]
among processes that share resources
[B]
between two disjoint processes that do not interact
[C]
among processes that do not use the same resource
[D]
none of the above
Comment
(48)
Which of the following.is a service not supported by the operating system?
[A]
I/O operation
[B]
Compilation
[C]
Accounting
[D]
Protection
Comment
(49)
A state is safe if the system can allocate resources to each process (up to its maximum) in some order and still avoid deadlock. Which of the following are true?
[A]
Deadlocked state is unsafe.
[B]
Deadlocked state is a subset of unsafe state.
[C]
Unsafe state may lead to a deadlock situation.
[D]
All are true.
Comment
(50)
In which of the following scheduling policies does context switching never take place?
[A]
Round-robin
[B]
Shortest job first
[C]
First-cum-first-served
[D]
Both (B) and (C)
Comment
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