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Campus Placement Papers CISCO
Posted Date: 04 Jul 2008 Resource Type: Articles/Knowledge Sharing Category: Placement Papers
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Posted By: sunil Member Level: Diamond
Rating:  Points: 2
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Aptitude Questions
1> The starting location of an array is 1000. If the array[1..5/...4] is
stored
in row major order, what is the location of element [4][3]. Each work
occupies
4 bytes.
2> If the number of leaves in a binary tree are N, then the total number of
internal nodes........(Assume complete binary tree)
ANS: N-1
3> The locality of reference means.............
4> If two ausigned 8 bit numbers are multiplied what is the memory space
required...............
5> The vector address of RST 7.5 is ............
ANS: 003C (multiply 7.5 by 8 and convert to hex)
6> int b = 0xAA;
b>>4;
printf("%x",b);
What is the output of the above program....
7> struct s1 { struct { struct {int x;}s2}s3}y;
How to access x? ANS: y.s3.s2.x
8> Why there is no recursion in Fortran?
ANS: There is no dynamic allocation
9> What is the worst case complexity of Quick sort?
ANS: O(n^2)
10> Quick sort uses..............
Ans: Divide and conquer
11> In a sequential search, the time it takes to search through n elements
is
12> What is the size of the array declared as double * X[5]
ANS: 5* sizeof (double *)
13> A binary search tree is given and asked to write the preorder traversal
result.
14> If size of the physical memory is 2^32-1, then the size of virtual
memory......
15> S-> A0B
A-> BB|0
B-> AA|1 How many strings of length 5 are possible with the above
productions??
16> (3*4096+15*256+3*16+3). How many 1's are there in the binary
representation
of the result.
ANS: 10
17> In memory mapped I/O how I/O is accessed.............
ANS: Just like a memory location (Means, I/O devices can be accessed using
the instructions like mov A,M etc...)
18> What is the use of ALE in 8085.......
ANS: To latch the lower byte of the address.
19> If the logical memory of 8 X 1024 is mapped into 32 frames, then the
number
of bits for the logical address ......
ANS: 13
20> Context free grammar is useful for...
ANS: If-then structures.
21> In ternary number representation, numbers are represented as 0,1,-1.
Here
-1 is represented as - (1 bar). Then how is 352/9 represented......
1
22> There are processors which take 4,1,8,1 machine cycles respectively. If
these are executed in round robin fashion with a time quantum of 4, what is
the
time it take for process 4 to complete....
ANS: 9
23> The minimum frequency of operation is specified for every processor
because......
24> In memory mapped I/O, what will happen if a device is identified with a
16
bit address and enabled by memory related control signals.....
25> The reason for preferring CMOS over NMOS is....
Ans: Low power consumption.
26> Two binary numbers A,B are given and asked to find out A-B.
27> Each character is represented by 7 bits, 1 bit is used to represent
error
bit and another bit for parity. If total number of bits transmitted is
1200bits, then number of symbols that can be transmitted.......
28> One question about the setassociativity of cache..
29> Write the postfix form of the following expression...
A+[[(B+C)+(D+E)*F]/G]
30> What is the function of the linker......
31> void f(int y)
{
struct s *ptr;
ptr = malloc (sizeof (struct)+ 99*sizeof(int));
}
struct s{
int i;
float p;
};
when free(ptr) is executed, then what will happen??
system concepts:
1.int a[5,6]
how much memory will be allocated
2.char p[6];
char *d[10];
ans:d=(char*)p
3.using LFU algorithm,how many page faults will occur of the pages r
1,2,1,3,4.
ans:1,4
4.in which layer the bridges r used.
a)data link layer
b)session layer
c)physical layer
d)network layer
5.#define d 10+10
main()
{ printf("%d",d*d);
}
6.in a complete binary tree if the number of levels r 4 then the number of
nodes will be,
7.if we delete a node from a balanced binary tree,how can we retain the
properties of balanced binary tree.
ans: by rotation at the nodes.
8.in a k-way search tree with N keys, the number of node/no. of leaves=
9.s->A0B
A->BB|1
B->AA|0
how many string can be constructed with length 5.
10.in which of the following regular expression the srting contains
atleast 2 concetive 1's.
ans:(0+10)*||(0+1)*
11.int i,j=1;
for(i=0;i<10;i++);
{
j=j+1;
}
printf("%d %d",i,j);
ans:10 11
12.static char *i;
i=malloc(sizeof(char));
find the error;
ans:malloc returns void
13.virtual memory address capacity depends on--
14.main()
{ int i=1;
fork();
fork();
fork();
printf("%d",i);
}
how many times i will be printed
ans:8
15.question on threads
16.int i=0xaa
char *p;
p=(char *)i;
p=p>>4;
printf("%x",p);
ans:0x000000a;
17.union
{ char *p;
int i;
char b;
}
main()
{
--
p=(char*)malloc(8*sizeof(char));
}
what is the size of union?
18.enum{sunday=-1,monday,...saturday}
printf("%d %d",sizeof(wednesday),wednesday);
19.struct x{
struct{
struct{
char ch;
} x;
}};
ans:definition wrong
20.struct *s;
s=(struct *)malloc(10*sizeof(struct)+90*sizeof(int));
free(s);
ans:total memory deallocated
21.one alogrithm is given:
ans:10395
22.func()
{ int x=1;
if(x=1)
x=1000;
else
x=10;
return x;
}
what is the return value?
ans:1000
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