Operating systems concept MCQ Test 43

UGC-NET/GATE Multiple Choice Questions for Operating System.

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Question 1
If the semaphore value is negative :
A
its magnitude is the number of processes waiting on that semaphore
B
it is invalid
C
no operation can be further performed on it until the signal operation is performed on it
D
none of the above
Question 2
Under multiprograming, turnaround time for short jobs is usually .......... and that for long jobs is slightly ...........
A
shortened; lengthened
B
shortened; shortened
C
lengthened; lengthened
D
None of the above
Question 3
A process ..... lower the priority of another process, if both are owned by the same owner.
A
must
B
can
C
cannot
D
none of the above
Question 4
The server must write all NFS data ............
A
synchronously
B
asynchronously
C
index-wise
D
none of the above
Question 5
Which of the following is a measure to test how good or bad a modular design is
A
Module strength
B
Static analysis
C
All of the above
D
None of the above
Question 6
Dijkstra's banking algorithm in an operating system, solves the problem of
A
deadlock avoidance
B
deadlock recovery
C
mutual exclusion
D
context switching
Question 7
Applying the LRU page replacement to the following reference string : 1 2 4 5 2 1 2 4 The main memory can accommodate 3 pages and it already has pages 1 and 2. Page 1 came in before page 2. How many page faults will occur ?
A
2
B
3
C
4
D
5
Question 8
Information in a memory that is no longer valid or wanted is known as
A
volatile
B
surplus
C
garbage
D
None of the above
Question 9
Object code
A
is the output of compilers, but not assemblers
B
must be "loaded" before execution
C
must be rewritten before execution
D
None of the above
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