Operating systems concept MCQ Test 41

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

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Question 1
In the bounded buffer problem, there are the empty and full semaphores that :
A
count the number of empty and full buffers
B
count the number of empty and full memory spaces
C
count the number of empty and full queues
D
none of the above
Question 2
To solve the problem of external fragmentation, ........ needs to be done periodically.
A
compaction
B
check
C
formatting
D
replacing memory
Question 3
Another solution to the problem of external fragmentation problem is to :
A
permit the logical address space of a process to be noncontiguous
B
permit smaller processes to be allocated memory at last
C
permit larger processes to be allocated memory at last
D
all of the above
Question 4
What are characteristics of signature based IDS ?
  1. Most are based on simple pattern matching algorithms.
  2. It is programmed to interpret a certain series of packets
  3. It models the normal usage of network as a noise characterization
  4. Anything distinct from the noise is assumed to be intrusion activity
A
I and III
B
II and III
C
II, III and IV
D
I and II
Question 5
What are physical separation and logical separation ?
  1. Physical separation in which process use different physical objects like separate printers
  2. Physical separation in which process having different security requirement at different times
  3. Logical separation In which users operate under illusion that no other processes exist
  4. Logical sepration In which processes conceal their datomputations
A
I and II
B
II and III
C
II, III and IV
D
I and III
Question 6
A ......... directory is mounted over a directory of a ....... file system.
A
local, remote
B
remote, local
C
none of the above
Question 7
The main problem with access control lists is :
A
their maintenance
B
their length
C
their permissions
D
all of the above
Question 8
The problem of thrashing is affected significantly by:
A
program structure
B
primary-storage size
C
all of the above
D
None of the above
Question 9
What are the characteristics of mutual exclusion using centralized approach ?
  1. One processor as coordinator which handles all requests
  2. It requires request,reply and release per critical section entry
  3. The method is free from starvation
  4. When responses are received from all processes, then process can enter its Critical Section
A
I and III
B
II and III
C
II, III and IV
D
I,II and III
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