**Multiple Choice Question on Data Structure and Algorithm Design**

*Q1. In in-order traversal of a binary tree, the root node is visited:*

*a: after the traversal of right & left sub-trees*

*b: before the traversal of right and left sub-trees*

**c. in-between the traversal of left and right sub-trees***d: none of these*

*Q2.If you wanted to make sure that closing parentheses ‘)’ match the opening parentheses ‘(‘ in a mathematical expression, which data-structure could help you?*

*a: Linked List*

**b: stack***c: queue*

*d: Graph*

*Q3. A binary search tree is also known as:*

*a: B-tree*

**b: binary sorted tree***c. AVL Tree*

*d: BST*

*Q4. A binary tree in which the node-values are not repeated is called:*

*a: B-tree*

**b: binary search tree***c. AVL Tree*

*d: B+ tree*

*Q5. A binary search tree in which the nodes have been inserted in the following order:60,55,95,40,30,100,35, the node with the value 47 will be inserted to the:*

*a: right of node with value 60*

*b: right of node with value 55*

**c: right of node with value 40***d: left of node with value 30*

*Q6. In the following post-order traversal of a binary tree: E,C,K,A,H,B,G,D,F, the root node is:*

*a: C*

*b: A*

*c: D*

**d: F**

*Q7. The complexity of bubble-sort algorithm is:*

**a: O(n2)***b: O(n*n)*

*c: O(n log n)*

*d: O(n*n log n)*

*Q8. Binary search is more suitable for:*

**a: array***b: linked list*

*c: stack*

*d: Queue*

*Q9. The complexity of binary-search algorithm is:*

**a: O(log n)***b: O(n log n)*

*c: O(n*2)*

*d: O(n+2)*

*Q10. The calloc() function can be used to allocate:*

**a: multiple blocks of memory***b: single block of memory*

*c: two blocks of memory*

*d: none of these*

*Q11. The postfix expression of the infix expression: A+B*(C+D)/F+D*E is:*

*a: AB+CD+*F/D+E**

**b: ABCD+*F/+DE*+***c: A*B+CD/F*DE++*

*d: A+*BCD/F*DE++*

*Q12. A linear list of elements in which deletion can be done from one end and insertion can take place at the other end is called:*

*a: Tree*

*b: stack*

**c: Queue***d: Linked list*

*Q13. Which data-structure is needed to convert infix notation to postfix notation:*

*a: queue*

**b: stack***c: tree*

*d: linked list*

*Q14. Which of the following sorting procedures is the slowest:*

*a: Quick sort*

**b: bubble sort***c: Shell sort*

*d: insertion sort*

*Q15. The ‘C’ declaration: int b[50]; reserves ____ successive memory locations, each large enough to contain a single integer:*

*a: 200*

*b: 10*

*c: 1000*

**d: 50**

*Q16. If n elements are to be sorted, the complexity of selection-sort is:*

*a: O(n*2)*

*b: O(nlog n)*

*c: O(n+3)*

**d: O(n2)**

*Q17. The operation of processing each element in the list is known as:*

*a: sorting*

*b: merging*

*c: inserting*

**d: traversal**

*Q18. Arrays are best data structures:*

**a: for relatively permanent collections***b: when the size of structure is constantly changing*

*c: for both the above situations*

*d: for none of the above situations*

*Q19. The data elements of an array are stored successively in memory cells because:*

**a: in this way the computer can calculate the address of other elements keeping track of address of first element***b: computer architecture allows arrays to be stored serially only*

*c: both of the above*

*d: none of the above*

*Q20. Pick the odd one out:*

*a: insertion sort*

*b: selection sort*

**c: counting sort***d: merge sort*

**Thanks**

**Mukesh Rajput**
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Thanks

Mukesh Rajput