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Friday 24 December 2010

Complete Finalterm paper 2010 CS301- Data Structures

FINALTERM  EXAMINATION
Spring 2010
CS301- Data Structures
Time: 90 min
Marks: 58

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Question No: 1      ( Marks: 1 ) - Please choose one


A solution is said to be efficient if it solves the problem within its resource constraints i.e. hardware and time.


       True

       False



Question No: 2      ( Marks: 1 ) - Please choose one


Which one of the following is known as "Last-In, First-Out" or LIFO Data Structure?


       Linked List

       Stack

       Queue

       Tree



Question No: 3      ( Marks: 1 ) - Please choose one


What will be postfix expression of the following infix expression?
Infix Expression : a+b*c-d


       ab+c*d-

       abc*+d-

       abc+*d-

       abcd+*-



Question No: 4      ( Marks: 1 ) - Please choose one


For compiler a postfix expression is easier to evaluate than infix expression?


       True

       False



Question No: 5      ( Marks: 1 ) - Please choose one


Consider the following pseudo code                                                                                              
declare a stack of characters
        while ( there are more characters in the word to read )
        {
           read a character
           push the character on the stack
        }
        while ( the stack is not empty )
        {
           pop a character off the stack
           write the character to the screen
        }
      
What is written to the screen for the input "apples"? www.allvupastpapers.blogspot.com  


       selpa

       selppa

       apples

       aaappppplleess


Question No: 6      ( Marks: 1 ) - Please choose one


Consider the following function:

void test_a(int n)
{
cout << n << " ";
if (n>0)
test_a(n-2);
}

What is printed by the call test_a(4)?


       4 2

       0 2 4

       0 2


       2 4



Question No: 7      ( Marks: 1 ) - Please choose one


If there are N external nodes in a binary tree then what will be the no. of internal nodes in this binary tree?


       N -1

       N+1

       N+2

       N



Question No: 8      ( Marks: 1 ) - Please choose one


If there are N internal nodes in a binary tree then what will be the no. of external nodes in this binary tree?


       N -1

       N

       N +1

       N +2



Question No: 9      ( Marks: 1 ) - Please choose one


If we have 1000 sets each containing a single different person. Which of the following relation will be true on each set:

       Reflexive 

        Symmetric 

        Transitive

         Associative



Question No: 10      ( Marks: 1 ) - Please choose one


Which one of the following is NOT the property of equivalence relation: 

       Reflexive 

       Symmetric 

       Transitive 

       Associative


Question No: 11      ( Marks: 1 ) - Please choose one


A binary tree of N nodes has  _______.


       Log10 N levels 

       Log2 N levels 

       N / 2 levels 

       N x 2 levels 


Question No: 12      ( Marks: 1 ) - Please choose one


The easiest case of deleting a node from BST is the case in which the node to be deleted  ___________.


        Is a leaf node 

       Has left subtree only 

       Has right subtree only 

       Has both left and right subtree 


Question No: 13      ( Marks: 1 ) - Please choose one


If there are N elements in an array then the number of maximum steps needed to find an element using Binary Search is _______ .

       N

       N2

       Nlog2N

       log2N


Question No: 14      ( Marks: 1 ) - Please choose one


Merge sort and quick sort both fall into the same category of sorting algorithms. What is this category?


       O(nlogn) sorts

       Interchange sort

       Average time is quadratic

       None of the given options.


Question No: 15      ( Marks: 1 ) - Please choose one


If one pointer of the node in a binary tree is NULL then it will be a/an _______ .


       External node

       Root node

       Inner node

       Leaf node


Question No: 16      ( Marks: 1 ) - Please choose one


We convert the ________ pointers of binary to threads in threaded binary tree.


       Left

       Right

       NULL

       None of the given options


Question No: 17      ( Marks: 1 ) - Please choose one


If the bottom level of a binary tree is NOT completely filled, depicts that the tree is NOT a


       Expression tree

       Threaded binary tree

       complete Binary tree

       Perfectly complete Binary tree


Question No: 18      ( Marks: 1 ) - Please choose one


What is the best definition of a collision in a hash table?


       Two entries are identical except for their keys.


                   Two entries with different data have the exact same key

       Two entries with different keys have the same exact hash value.


                   Two entries with the exact same key have different hash values.


Question No: 19      ( Marks: 1 ) - Please choose one


Suppose that a selection sort of 100 items has completed 42 iterations of the main loop. How many items are now guaranteed to be in their final spot (never to be moved again)?


       21

       41

       42

       43



Question No: 20      ( Marks: 1 ) - Please choose one


Suppose you implement a Min heap (with the smallest element on top) in an array. Consider the different arrays below; determine the one that cannot possibly be a heap:                

       16, 18, 20, 22, 24, 28, 30  

       16, 20, 18, 24, 22, 30, 28

       16, 24, 18, 28, 30, 20, 22

       16, 24, 20, 30, 28, 18, 22


Question No: 21      ( Marks: 1 ) - Please choose one


Do you see any problem in the code of nextInOrder below:

TreeNode * nextInorder(TreeNode * p)
{
   if(p->RTH == thread)
     return( p->R );
   else {
     p = p->R;
   while(p->LTH == child)
  p = p->R;
   return p;
   }
} 



        The function has no problem and will fulfill the purpose successfully. 

        The function cannot be compile as it has syntax error. 

        The function has logical problem, therefore, it will not work properly. 

        The function will be compiled but will throw runtime exception immediately after the control is transferred to this function. 


Question No: 22      ( Marks: 1 ) - Please choose one


Which of the following statement is correct about find(x) operation: 


       A find(x) on element x is performed by returning exactly the same node that is found. 

        A find(x) on element x is performed by returning the root of the tree containing x. 

        A find(x) on element x is performed by returning the whole tree itself containing x.

       A find(x) on element x is performed by returning TRUE. 


Question No: 23      ( Marks: 1 ) - Please choose one


Which of the following statement is NOT correct about find operation: 


          It is not a requirement that a find operation returns any specific name, just that finds on two elements return the same answer if and only if they are in the same set. 

       One idea might be to use a tree to represent each set, since each element in a tree has the same root, thus the root can be used to name the set. 


        Initially each set contains one element. 

        Initially each set contains one element and it does not make sense to make a tree of one node only. 


Question No: 24      ( Marks: 1 ) - Please choose one


In complete binary tree the bottom level is filled from ________

       Left to right

       Right to left

       Not filled at all

       None of the given options


Question No: 25      ( Marks: 1 ) - Please choose one


Here is an array of ten integers:
            5   3   8   9   1   7   0   2   6   4
The  array after the FIRST iteration of the large loop in a selection sort (sorting from smallest to largest).


       0   3    8    9    1     7     5     2     6    4

       2     6    4    0   3    8    9    1     7     5  

       2     6    4    9    1     7     0   3    8    5  

       0   3    8     2     6    4    9    1     7       5  



Question No: 26      ( Marks: 1 ) - Please choose one


What requirement is placed on an array, so that binary search may be used to locate an entry?


       The array elements must form a heap.

       The array must have at least 2 entries.

       The array must be sorted.

       The array’s size must be a power of two.


Question No: 27      ( Marks: 2 )


Give one example of Hashing



Question No: 28      ( Marks: 2 )


How heap sort works to sort a set of data.



Question No: 29      ( Marks: 2 )


How we can implement Table ADT using Linked List



Question No: 30      ( Marks: 2 )


If we allow assignment to constants what will happen?



Question No: 31      ( Marks: 3 )


Explain the process of Deletion in a Min-Heap



Question No: 32      ( Marks: 3 )


Give any three characteristics of Union by Weight method.



Question No: 33      ( Marks: 3 )


"For smaller lists, linear insertion sort performs well, but for larger lists, quick sort is suitable to apply." Justify why?


Question No: 34      ( Marks: 5 )


Write down the C++ code to implement Insertion Sort Algorithm.



Question No: 35      ( Marks: 5 )


Consider the following Threaded Binary Tree,
You have to give the values that should be in the four variables given below, for the node 37

1.      LTH (Left flag)
2.      RTH (Right flag)
3.      Left node pointer (->L)
4.      Right node pointer (->R)



Question No: 36      ( Marks: 5 )


What is Disjoint Sets? Explain with an example.


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