UGC-NET/GATE Multiple Choice Questions for Operating System.
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A non blocking system call ..................
halts the execution of the application for an extended time
does not halt the execution of the application
does not block the interrupts
none of the above
A scheduling algorithm can use either ........... priority or ........ priority.
none of the above
What are two features of a tripwire file system ?
- It is a tool to monitor file systems
- It is used to alert system administrator to these modification
- It is used to automatically take corrective action
- It is used to secure UNIX system
I and III
II and III
II, III and IV
I and II
By preallocating the inodes and spreading them across the volume, we ........... the system performance.
do not affect
Which of the following is TRUE ?
Overlays are used to increase the size of physical memory
Overlays are used to increase the logical address space
When overlays are used, the size of a process is not limited to the size of the physical memory
Overlays are used whenever the physical address space is smaller than the logical address space
Job Control Language (JCL) statements are used to
Specify, to the operating system, the beginning and end of a job in a batch
Allocate the CPU to a job
All of the above
None of the above
When the page fault rate is low :
the turnaround time increases
the effective access time increases
the effective access time decreases
A and B
There are 10 different processes running on a workstation. Idle processes are waiting for an input event in the input queue. Busy processes are scheduled with the Round-Robin timesharing method. Which out of the following quantum times is the best value for small response times, if the processes have a short runtime, e.g. less than 10ms ?
tQ = 15ms
tQ = 40ms
tQ = 45ms
tQ = 50ms
The security of a system can be improved by
both (A) and (B)
none of these
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