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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.
(1)
Fragmentation is
[A]
fragments of memory words unused in a page
[B]
fragments of memory words used in a page
[C]
dividing the main memory into equal-sized fragments
[D]
dividing the secondary memory into equal sized fragments
Comment
(2)
Critical region is
[A]
the portion of the main memory which can be accessed only by one process at a time
[B]
a part of the operating system which is not allowed to be accessed by any process
[C]
a set of instructions that access common shared resource which exclude one another in time
[D]
none of the above
Comment
(3)
In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the RUNNING state to the
[A]
READY state
[B]
BLOCKED state
[C]
TERMINATED state
[D]
SUSPENDED state
Comment
(4)
Pre-emptive scheduling, is the strategy of temporarily suspending a running process
[A]
when it requests (I/O)
[B]
to allow starving processes to run
[C]
before the CPU time slice expires
[D]
none of the above
Comment
(5)
Some computer systems support dual mode operation—the user mode and the supervisor or monitor mode. These refer to the modes
[A]
of memory access
[B]
by which user programs handle their data
[C]
by which the operating system executes user programs
[D]
in which the processor and the associated hardware operate
Comment
(6)
In Round Robin CPU scheduling, as the time quantum is increased, the average turn around
[A]
remains constant
[B]
varies irregularly
[C]
increases
[D]
decrease
Comment
(7)
Suppose that a process is in ‘BLOCKED’ state waiting for some I/O service. When the service is completed, it goes to the
[A]
RUNNING state
[B]
READY state
[C]
SUSPENDED state
[D]
TERMINATED state
Comment
(8)
To obtain better memory utilization, dynamic loading is used. With dynamic loading a routine is not loaded until it is called for. For implementing dynamic loading,
[A]
special support from operating system is essential
[B]
special support from hardware is essential
[C]
special support from both hardware and operating system are essential
[D]
user programs can implement dynamic loading without any special support from the operating system or the hardware.
Comment
(9)
Semaphores are used to solve the problem of
[A]
race condition
[B]
mutual exclusion
[C]
process synchronization
[D]
Both (B) and (C)
Comment
(10)
Dijkstra’s banking algorithm in an operating system solves the problem of
[A]
mutual exclusion
[B]
context switching
[C]
deadlock avoidance
[D]
deadlock recovery
Comment
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