online aptitude test for IT companies

Pick the odd man out:
3,5,11,14,17,21

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

18,10,80,88,10,2,16,24,8,0,0, ?

If A + B means A is the brother of B; A - B means A is the sister of B and A x B means A is the father of B. Which of the following means that C is the son of M?

___________is very useful in situation when data have to stored and then retrieved in reverse order.

#include <stdio.h>  
int main() {    
  int x=30, *y, *z;     
  y = &x; /* Assume address of x is 500 */    
  z = y;  
  *y= *z;  
  x++;    
  printf("x=%d, y=%u, z=%u\n", x, *y, z);
  return 0;
}

If the given input array is sorted or nearly sorted, which of the following algorithm gives the best performance?

#include<stdio.h>  
int main() {     
  int i = 10;     
  int *j = &i;     
  return 0;
}

Which of the following layers are not in TCP / IP?

While converting binary tree into extended binary tree, all the original nodes in binary tree are _____

What are the reasons for adding an index to a table ?