MIDTERM EXAMINATION
Spring 2010
CS301- Data Structures
Time: 60 min
M a r k s: 38
Question No: 1 ( M a r k s: 1 ) http://vuzs.net
In an array we can store data elements of different types.
► True
► False
Question No: 2 ( M a r k s: 1 ) http://vuzs.net
In an array list the current element is
► The first element
► The middle element
► The last element
► The element where the current pointer points to
Question No: 3 ( M a r k s: 1 ) http://vuzs.net
Which one of the following calling methods does not change the original value of the argument in the calling function?
► None of the given options
► Call by passing the value of the argument
► Call by passing reference of the argument
► Call by passing the address of the argument
Question No: 4 ( M a r k s: 1 ) http://vuzs.net
Which one of the following statements is NOT correct?
► Array size can be changed after its creation.
► Link List size can be changed after its creation.
► Binary Search Tree size can be changed after its creation
► AVL Tree size can be changed after its creation
Question No: 5 ( M a r k s: 1 ) http://vuzs.net
Suppose that the class declaration of SomeClass includes the following function prototype.
bool LessThan( SomeClass anotherObject );
Which of the following tests in the client code correctly compares two class objects alpha and beta?
► if (alpha < beta)
► if (alpha.LessThan(beta))
► if (LessThan(alpha, beta))
► if (LessThan(alpha).beta)
Question No: 6 ( M a r k s: 1 ) http://vuzs.net
A queue is a ________data structure, whereas a stack is a ________data structure.
► FIFO, LIFO
► LIFO,FIFO
► none of these
► both of these
Question No: 7 ( M a r k s: 1 )
Which one of the following operators has higher priority than all of others ?
► Multiplication operator
► Minus operator
► Plus operator
► Exponentiation operator
Question No: 8 ( M a r k s: 1 ) http://vuzs.net
Each node in Binary Search Tree has,
► 1 pointer
► 2 pointers
► 3 pointers
► 4 pointers
Question No: 9 ( M a r k s: 1 ) http://vuzs.net
Four statements about trees are below. Three of them are correct. Which one is INCORRECT?
► Trees are recursively defined multi-dimensional data structures
► The order of a tree indicates a maximum number of childen allowed at each node of the tree
► A search tree is a special type of tree where all values (i.e. keys) are ordered
► If Tree1's size is greater than Tree2's size, then the height of Tree1 must also be greater than Tree2's height.
Question No: 10 ( M a r k s: 1 ) http://vuzs.net
Which of the following is "TRUE" about arrays,
► We can increase the size of arrays after their creation.
► We can decrease the size of arrays after their creation.
► We can increase but can't decrease the size of arrays after their creation.
► We can neither increase nor decrease the array size after their creation.
Question No: 11 ( M a r k s: 1 ) http://vuzs.net
Searching an element in an AVL tree take maximum _______ time (where n is no. of nodes in AVL tree),
► Log2(n+1)
► Log2(n+1) -1
► 1.44 Log2n
► 1.66 Log2n
Question No: 12 ( M a r k s: 1 ) http://vuzs.net
There is/are ________ case/s for rotation in an AVL tree,
► 1
► 3
► 2
► 4
Question No: 13 ( M a r k s: 1 ) http://vuzs.net
Consider the following statements.
(i) A binary tree can contain at least 2L Nodes at level L.
(ii) A complete binary tree of depth d is a binary tree that contains 2L Nodes at each level L between 0 and d, both inclusive.
(iii) The total number of nodes (Tn ) in a complete binary tree of depth d is 2 d+1 - 1 .
(iv) The height of the complete binary tree can be written as h = log 2 (Tn+1)-1 where Tn is Total number of Nodes.
Which one of the following is correct in respect of the above statements regarding the Binary trees?
► (i) and (iii) only
► (i), (ii) and (iii) only
► (ii) and (iii) only
► (ii), (iii) and (iv) only
Question No: 14 ( M a r k s: 1 ) http://vuzs.net
Consider the following infix expression.
5 + 6/2
If one converts the above expression into postfix, what would be the resultant expression?
► 56/ + 2
► 5 6 2 / +
► 5 6 / 2 +
► /62 + 5
Question No: 15 ( M a r k s: 1 ) http://vuzs.net
Which of the following is a non linear data structure?
► Linked List
► Stack
► Queue
► Tree
Question No: 16 ( M a r k s: 1 ) http://vuzs.net
“+” is a _________operator.
► Unary
► Binary
► Ternary
► None of the above
Question No: 17 ( M a r k s: 2 )
Which process places data at the back of the queue?
Question No: 18 ( M a r k s: 2 )
How we can delete a node with two Childs in a binary search tree using its right sub tree.
Question No: 19 ( M a r k s: 2 )
Why we use Reference Variables. Give one example.
Question No: 20 ( M a r k s: 3 )
The nodes of a binary tree have data 1, 2, 3, 4. The in-order traversal of the tree yields 2,1,4,3. The postorder traversal is 2, 4, 3, 1. The root of the tree is at level 0.
Q3: Which value is in the right child of the root? (1 Pt)
(A) 1 (B) 2 (C) 3 (D) 4 (E) none
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Question No: 21 ( M a r k s: 3 )
What normally is the sequence of operations while constructing an AVL tree?
Question No: 22 ( M a r k s: 5 )
Here is a small binary tree:
14
/ \
2 11
/ \ / \
1 3 10 30
/ /
7 40
Write the order of the nodes visited in:
A. An in-order traversal:
B. A pre-order traversal:
Question No: 23 ( M a r k s: 5 )
Is the given tree is an AVL tree? If Not then redraw is so that it becomes AVL
