Operating systems concept MCQ Test 20

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

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Question 1
A character stream device transfers :
A
bytes one by one
B
block of bytes as a unit
C
with unpredictable response times
D
none of the above
Question 2
How is disadvantage of all-or-nothing approach overcome ?
A
Base/Bound
B
Relocation technique
C
Fence method
D
Tagged architecture
Question 3
A system with 5 processes P0 through P4 and three resource types A, B, C has A with 10 instances, B with 5 instances, and C with 7 instances. At time t0, the following snapshot has been taken : Process P0 P1 P2 P3 P4 Allocation (process-wise : P0 through P4 top to bottom) A B C 0 1 0 2 0 0 3 0 2 2 1 1 0 0 2 Max (process-wise : P0 through P4 top to bottom) A B C 7 5 3 3 2 2 9 0 2 2 2 2 4 3 3 Available A B C 3 3 2 The sequence leads the system to :
A
an unsafe state
B
a safe state
C
a protected state
D
a deadlock
Question 4
VxWorks is centered around
A
wind microkernel
B
linux kernel
C
unix kernel
D
none of the above
Question 5
What is breach of availability ?
A
This type of violation involves unauthorized reading of data
B
This violation involves unauthorized modification of data.
C
This violation involves unauthorized destruction of data
D
This violation involves unauthorized use of resources
Question 6
The faster the frames are displayed, :
A
the rougher the video appears
B
the smoother the video appears
C
it gets blurry
D
none of the above
Question 7
The main memory accommodates :
  1. operating system
  2. CPU
  3. user processes
  4. All of these
A
I and II
B
II and III
C
II, III and IV
D
I and III
Question 8
Waiting time is :
A
the total time in the blocked and waiting queues
B
the total time spent in the ready queue
C
the total time spent in the running queue
D
the total time from the completion till the submission of a process
Question 9
Floppy disks are examples of :
A
primary storage
B
secondary storage
C
tertiary storage
D
none of the above
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