Operating systems concept MCQ Test 46

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

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Question 1
The disadvantage of real addressing mode is :
A
there is a lot of cost involved
B
time consumption overhead
C
absence of memory protection between processes
D
restricted access to memory locations by processes
Question 2
Which one of the following is not a valid state of a thread?
A
running
B
parsing
C
ready
D
blocked
Question 3
Time required to synchronous switch from the context of one thread to the context of another thread is called
A
threads fly-back time
B
jitter
C
context switch time
D
none of the above
Question 4
The host controller is :
A
controller built at the end of each disk
B
controller at the computer end of the bus
C
both A and B
D
neither A nor B
Question 5
What is networked virtual memory ?
A
Caching
B
Segmentation
C
RAM disk
D
none of the above
Question 6
What are the characteristics of fully distributed approach ?
  1. When responses are received from all processes, then process can enter its Critical Section
  2. When process exits its critical section, the process sends reply messages to all its deferred requests.
  3. It requires request,reply and release per critical section entry
  4. One processor as coordinator which handles all requests
A
I and III
B
II and III
C
II, III and IV
D
I and II
Question 7
In asymmetric encryption
A
same key is used for encryption and decryption
B
different keys are used encryption and decryption
C
no key is required for encryption and decryption
D
none of the above
Question 8
The file organization module knows about :
A
files
B
logical blocks of files
C
physical blocks of files
D
all of the above
Question 9
The disadvantage of moving all process to one end of memory and all holes to the other direction, producing one large hole of available memory is :
A
the cost incurred
B
the memory used
C
the CPU used
D
all of the above
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