41. How
many different Boolean functions of degree 4 are there?
(A) 24 (B) 28
(C) 212 (D) 216
Answer: D
Explanation:
Number of Boolean expression = 2^2n
= 2^24 = 216
42. A
Boolean operator Ó¨ is defined as
follows:
1Ó¨1=1, 1Ó¨0=0, 0Ó¨1=0 and 0Ó¨0=1
What will be the truth value of the
expression (xÓ¨y)Ó¨z = xÓ¨(yÓ¨z)?
(A) Always false
(B) Always true
(C) Sometimes true
(D) True when x, y, z are all true
Answer: B
43. Which
one of the following is decimal value of a signed binary number 1101010, if it
is in 2's complement form?
(A) -42 (B) - 22
(C) -21 (D) -106
Answer: B
44. A
set of processors P1, P2, ......, Pk can
execute in parallel if Bernstein's conditions are satisfied on a pair wise
basis; that is
P1 || P2 || P3
|| ..... || Pk if and only if:
(A) Pi || Pj for all i
≠ j
(B) Pi || Pj for all i
= j+1
(C) Pi || Pj for all i
≤ j
(D) Pi || Pj for all i
≥ j
Answer: A
Explanation:
Bernstein’s Condition:
1. If process Pi writes to a memory cell Mi,
then no process Pj can read the cell Mi.
2. If process Pi read from a memory cell Mi,
then no process Pj can write to the cell Mi.
3. If process Pi writes to a memory cell Mi,
then no process Pj can write to the cell Mi.
45. When
a mobile telephone physically moves from one to another cell, the base station
transfers ownership to the cell getting strongest signal. This process is known
as.................
(A) handoff (B)
mobile switching
(C) mobile routing (D) cell switching
Answer: A
46. A
virtual memory based memory management algorithm partially swaps out a process.
This is an example of
(A) short term scheduling (B)
long term scheduling
(C) medium term scheduling (D) mutual exclusion
Answer: C
47. Assuming
that the disk head is located initially at 32, find the number of disk moves
required with FCFS if the disk queue of I/O block requests are 98, 37, 14, 124,
65, 67:
(A) 310 (B) 324
(C) 320 (D) 321
Answer: D
48. Let
the page fault service time be 10 millisecond(ms) in a computer with average
memory access time being 20 nanosecond(ns). If one page fault is generated for
every 106 memory accesses, what is the effective access time for memory?
(A) 21 ns (B)
23 ns
(C) 30 ns (D)
35 ns
Answer: C
49. Consider
the following UNIX command:
sort <in> temp; head -30 <temp; rm
temp
Which of the following functions shall be
performed by this command?
(A) Sort, taking the input from
"temp", prints 30 lines from temp and delete the file temp
(B) Sort the file "temp", removes
30 lines from temp and delete the file temp
(C) Sort, taking the input from
"in" and writing the output to "temp" then prints 30 lines
from temp on terminal. Finally "temp" is removed.
(D) Sort, taking the input from 'temp"
and then prints 30 lines from "temp" on terminal. Finally
"temp" is removed.
Answer: C
50. The
mv command changes
(A) the inode
(B) the inode-number
(C) the directory entry
(D) both the directory entry and the inode
Answer: C
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