**CISCO PLACEMENT PAPER QUESTIONS**

**Interview PAPER 2007 december**

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-> BB0

B-> AA1 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 1200 bits, 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??

Remember a lotta these questions with detailed explanation can be foundAt this Website

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