41. Loop
unrolling is a code optimization technique:
(A) that
avoids tests at every iteration of the loop
(B) that
improves performance by decreasing the number of instructions in a basic block.
(C) that
exchanges inner loops with outer loops
(D) that
reorders operations to allow multiple computations to happen in parallel.
Answer:
A
42.
What will be the hexadecimal value in the
register ax (32-bit) after executing the following instructions?
Mov al, 15
Mov ah, 15
Xor al, al
Mov cl, 3
Shr ax, cl
Codes:
(A) 0F00 h (B) 0F0F h
(C) 01E0 h (D) FFFF h
Answer:
C
43. Which
of the following statements is false?
(A) Top-down
parsers are LL parsers where first L stands for left-to-right scan and second L
stands for a leftmost derivation.
(B) (000)*
is a regular expression that matches only strings containing an odd number of
zeroes, including the empty string.
(C) Bottom-up
parsers are in the LR family, where L stands for left-to-right scan and R
stands for rightmost derivation
(D) The
class of context-free languages is closed under reversal. That is, if L is any
context-free language, then the language LR={WR:wϵL} is
context free.
Answer:
B
44. System
calls are usually invoked by using:
(A) A
privileged instruction (B) An indirect
jump
(C) A
software interrupt (D) Polling
Answer:
C
45. The
............... transfers the executable image of a C++ program from hard disk to
main memory.
(A) Compiler (B) Linker
(C) Debugger (D) Loader
Answer:
D
46. In
software testing, how the error, fault and failure are related to each other?
(A) Error
leads to failure but fault is not related to error and failure
(B) Fault
leads to failure but error is not related to fault and failure
(C) Error
leads to fault and fault leads to failure
(D) Fault
leads to error and error leads to failure
Answer:
C
47. Which
of the following is not a software process model?
(A) Prototyping (B) Iterative
(C) Timeboxing (D) Glassboxing
Answer:
D
48. How
many solutions are there for the equation x+y+z+u=29 subject to the constraints
that x≥1, y≥2, z≥3 and u≥0?
(A) 4960 (B) 2600
(C) 23751 (D) 8855
Answer:
B
Explanation:
We let y1=x-1, y2=y-2, y3=z-3, y4=u-0
We count the number of solutions for y1+y2+y3+y4=29-6=23
n=4, r=23
The number of solutions is C(n+r-1, r) = C(4+23-1, 23)
= C(26,23) = C(26,3) = 26x25x24/1x2x3 = 2600
Explanation:
We let y1=x-1, y2=y-2, y3=z-3, y4=u-0
We count the number of solutions for y1+y2+y3+y4=29-6=23
n=4, r=23
The number of solutions is C(n+r-1, r) = C(4+23-1, 23)
= C(26,23) = C(26,3) = 26x25x24/1x2x3 = 2600
49. A
unix file system has 1-KB blocks and 4-byte disk addresses. What is the maximum
file size if i-nodes contain 10 direct entries and one single, double and
triple indirect entry each?
(A) 32 GB (B) 64 GB
(C) 16 GB (D) 1 GB
Answer:
C
Explanation:
block = 210
block
pointer size = 4B
entries
possible in block = 210/22 = 256
direct
pointer gives = 10 * 256 = 10 blocks
single
indirect gives = 256 * 256 = 28 blocks
double
indirect gives = 256 * 256 * 256 = 216 blocks
triple indirect
gives = 256 * 256 * 256 * 256 = 224 blocks
total = 10
blocks + 28 blocks + 216 blocks + 224 blocks
= 16843018 blocks
= 16843018 * 1024 = 17247250432 ≈ 16 GB
50. .................
uses electronic means to transfer funds directly from one account to another
rather than by cheque or cash?
(A) M-Banking (B) E-Banking
(C) O-Banking (D) C-Banking
Answer:
B
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