Data Structures and Algorithms Question Bank Complete Exam Prep Resource 2025/ 2026

Data Structures and Algorithms Question Bank 4/9/2026 Page 1




Data Structures and Algorithms: Question Bank

I. Multiple Choice Questions (MCQs) (30 Questions)
1. Which of the following is not a basic operation on a data structure?
a) Traversal
b) Insertion
c) Compilation
d) Deletion
Answer: c) Compilation
2. Time complexity of binary search algorithm is:
a) O(n)
b) O(log n)
c) O(n log n)
d) O(n^2)
Answer: b) O(log n)
3. Which data structure uses the LIFO principle?
a) Queue
b) Stack
c) Linked List
d) Array
Answer: b) Stack
4. Which of these is not a type of queue?
a) Simple Queue
b) Circular Queue
c) Priority Queue
d) Binary Queue
Answer: d) Binary Queue
5. What is the space complexity of merge sort?
a) O(1)
b) O(log n)
c) O(n)
d) O(n log n)
Answer: c) O(n)
6. Which of the following traversals is used for expression tree evaluation?
a) Preorder
b) Inorder
c) Postorder
d) Level Order
Answer: c) Postorder
7. Which algorithm is best for sorting large datasets?
a) Bubble Sort
b) Insertion Sort
c) Quick Sort
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d) Selection Sort
Answer: c) Quick Sort
8. Which data structure is used in BFS of graph?
a) Stack
b) Queue
c) Priority Queue
d) Tree
Answer: b) Queue
9. The worst-case time complexity of linear search is:
a) O(1)
b) O(n)
c) O(log n)
d) O(n^2)
Answer: b) O(n)
10. Which of the following trees is height-balanced?
a) Binary Tree
b) AVL Tree
c) Threaded Tree
d) B+ Tree
Answer: b) AVL Tree
11. Which sorting algorithm has the best worst-case performance?
a) Bubble Sort
b) Merge Sort
c) Quick Sort
d) Insertion Sort
Answer: b) Merge Sort
12. Which structure is used to implement recursion?
a) Stack
b) Queue
c) Tree
d) Linked List
Answer: a) Stack
13. What is the in-order traversal of a binary search tree?
a) Sorted order
b) Reverse order
c) Random order
d) Preorder
Answer: a) Sorted order
14. In which tree every internal node has exactly two children?
a) Binary Tree
b) Binary Search Tree
c) Full Binary Tree
d) AVL Tree
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Answer: c) Full Binary Tree
15. Which data structure is suitable for implementing undo operations?
a) Queue
b) Stack
c) Graph
d) Array
Answer: b) Stack
16. What is the complexity of inserting an element in a linked list at the end?
a) O(1)
b) O(n)
c) O(log n)
d) O(n log n)
Answer: b) O(n)
17. What is the height of a binary tree with n nodes in the worst case?
a) log n
b) n
c) n/2
d) n^2
Answer: b) n
18. Which hashing technique handles collisions using a linked list?
a) Linear probing
b) Chaining
c) Double hashing
d) Rehashing
Answer: b) Chaining
19. Which queue allows insertion at one end and deletion at another?
a) Priority Queue
b) Circular Queue
c) Simple Queue
d) Deque
Answer: c) Simple Queue
20. Which graph representation uses adjacency matrix?
a) Linked List
b) 2D Array
c) Set
d) Tree
Answer: b) 2D Array
21. Which of the following is not a property of binary search tree?
a) Left subtree has lesser values
b) Right subtree has greater values
c) Duplicates allowed
d) Recursive structure Answer: c) Duplicates allowed
22. A complete binary tree is:
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