Operating systems concept MCQ Test 25

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

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Question 1
A relative block number is an index relative to :
A
the beginning of the file
B
the end of the file
C
the last written position in file
D
none of the above
Question 2
When a page is selected for replacement, and its modify bit is set :
  1. the page is clean
  2. the page has been modified since it was read in from the disk
  3. the page is dirty
A
I and III
B
II and IV
C
II, III and IV
D
II and IIII
Question 3
Under multiprogramming, turnaround time for short jobs is usually ........ and that for long jobs is slightly ............
A
Lengthened; Shortened
B
Shortened; Lengthened
C
Shortened; Shortened
D
Shortened; Unchanged
Question 4
Which of the following are loaded into main memory when the computer is booted?
A
internal command instructions
B
utility programs
C
word processing instructions
D
None of the above
Question 5
Which of the following refers to the associative memory?
A
the address of the data is supplied by the users
B
there is no need for an address i.e. the data is used as an address
C
the data are accessed sequentially
D
None of the above
Question 6
Optical disks ...... magnetism.
A
use
B
do not use
C
may use
D
none of the above
Question 7
When a process terminates :
  1. It is removed from all queues
  2. It is removed from all, but the job queue
  3. Its process control block is de-allocated
  4. Its process control block is never de-allocated
A
I and II
B
II and III
C
II, III and IV
D
I and III
Question 8
A self-relocating program is one which
A
consists of a program and relevant information for its relocation.
B
can itself performs the relocation of its address-sensitive portions.
C
All of the above
D
None of the above
Question 9
The data structure used for file directory is called
A
mount table
B
hash table
C
file table
D
process table
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