Operating systems concept MCQ Test 22

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

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Question 1
Memory protection in a paged environment is accomplished by :
A
protection algorithm with each page
B
restricted access rights to users
C
restriction on page visibility
D
protection bit with each page
Question 2
The most common systems security method is
A
passwords
B
firewall
C
all of the above
D
None of the above
Question 3
Disk requests come to a disk driver for cylinders 10, 22, 20, 2, 40, 6 and 38, in that order at a time when the disk drive is reading from cylinder 20. The seek time is 6 ms per cylinder. If the scheduling algorithm is the closest cylinder next, then the total seek time will be
A
360 ms
B
876 ms
C
850 ms
D
900 ms
Question 4
The operating system of a computer serves as a software interface between the user and
A
hardware
B
memory
C
screen
D
None of the above
Question 5
For a Hold and wait condition to prevail :
A
A process must be not be holding a resource, but waiting for one to be freed, and then request to acquire it
B
A process must be holding at least one resource and waiting to acquire additional resources that are being held by other processes
C
A process must hold at least one resource and not be waiting to acquire additional resources
D
none of the above
Question 6
System maintenance:
A
is necessary on all systems, regardless of how good
B
is not required if the system is well written
C
always requires several programs
D
None of the above
Question 7
The technique in which the CPU generates physical addresses directly is known as :
A
relocation register method
B
real addressing
C
virtual addressing
D
none of the above
Question 8
The process of dividing a disk into sectors that the disk controller can read and write, before a disk can store data is known as :
  1. partitioning
  2. swap space creation
  3. low-level formatting
  4. physical formatting
A
I and III
B
II and III
C
II, III and IV
D
III and IV
Question 9
In internal fragmentation, memory is internal to a partition and :
A
is being used
B
is not being used
C
is always used
D
none of the above
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