Operating systems concept MCQ Test 18

By | October 3, 2017
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UGC-NET/GATE Multiple Choice Questions for Operating System.

Question 1
For a computer to deliver continuous media it must guarantee the specific rate and timing requirements, also known as :
A
deadline
B
Quality of service
C
period
D
burst time
Question 2
Which of the following statements is false?
A
time sharing systems generally use preemptive CPU scheduling
B
response time are more predictable in preemptive systems than in non preemptive systems
C
real time systems generally use non-preemptive CPU scheduling
D
None of the above
Question 3
What is used to protect network from outside internet access ?
A
A trusted antivirus
B
24 hours scanning for virus
C
Firewall to separate trusted and untrusted network
D
Deny users access to websites which can potentially cause security leak.
Question 4
The initial value of the semaphore that allows only one of the many processes to enter their critical sections, is
A
1
B
16
C
0
D
None of the above
Question 5
Which facility dynamically adds probes to a running system, both in user processes and in the kernel?
A
DTrace
B
DLocate
C
DMap
D
DAdd
Question 6
Access to moving head disks requires three periods of delay before information is brought into memory. The response that correctly lists the three time delays for the physical access of data in the order of the relative speed from the slowest to the fastest is
A
latency time, cache overhead time, seek time
B
transmission time, latency time, seek time
C
seek time, latency time, transmission time
D
cache overhead time, latency time, seek time
Question 7
A consistency checker .................. and tries to fix any inconsistencies it finds.
A
compares the data in the secondary storage with the data in the cache
B
compares the data in the directory structure with the data blocks on disk
C
compares the system generated output and user required output
D
all of the above
Question 8
...... of the distributed file system are dispersed among various machines of distributed system.
A
Clients
B
Servers
C
Storage devices
D
all of the above
Question 9
Swapping ....... be done when a process has pending I/O, or has to execute I/O operations only into operating system buffers.
A
must
B
can
C
must never
D
maybe
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There are 9 questions to complete.

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