Data Structures MCQsBy: Prof. Dr. Fazal Rehman | Last updated: April 16, 2025 40 Score: 0 Attempted: 0/40 Subscribe 1. What is the primary purpose of a data structure? (A) To store data (B) To organize data (C) To retrieve data efficiently (D) All of the above 2. Which of the following is a linear data structure? (A) Tree (B) Graph (C) Array (D) Hash Table 3. What type of data structure uses a Last In First Out (LIFO) order? (A) Queue (B) Stack (C) Linked List (D) Array 4. Which operation is NOT typically performed on a queue? (A) Enqueue (B) Dequeue (C) Push (D) Peek 5. What is the time complexity of accessing an element in an array? (A) O(1) (B) O(n) (C) O(log n) (D) O(n^2) 6. Which data structure is used for implementing recursion? (A) Queue (B) Stack (C) Array (D) Linked List 7. What is the worst-case time complexity of searching in a binary search tree? (A) O(1) (B) O(log n) (C) O(n) (D) O(n log n) 8. Which of the following is a non-linear data structure? (A) Array (B) Linked List (C) Stack (D) Tree 9. What is the maximum number of nodes in a binary tree with a height of h? (A) h (B) 2^h (C) 2^(h+1) – 1 (D) h^2 10. In which data structure are elements added and removed from the same end? (A) Queue (B) Stack (C) Deque (D) Array 11. What is a key characteristic of a doubly linked list? (A) Each node has one pointer (B) Nodes can only be traversed forward (C) Nodes can be traversed in both directions (D) It requires more memory than a singly linked list 12. What type of search algorithm uses a divide and conquer approach? (A) Linear Search (B) Binary Search (C) Breadth-First Search (D) Depth-First Search 13. Which data structure is best suited for implementing a priority queue? (A) Array (B) Linked List (C) Heap (D) Stack 14. What is the main advantage of using a hash table? (A) Fast search times (B) Ordered data (C) Less memory usage (D) Easy implementation 15. Which of the following traversals is not applicable to a binary tree? (A) Inorder (B) Preorder (C) Postorder (D) Level-order 16. What is the average-case time complexity for inserting an element in a hash table? (A) O(1) (B) O(log n) (C) O(n) (D) O(n log n) 17. Which data structure is used to implement recursion? (A) Queue (B) Stack (C) Array (D) Tree 18. What is a common application of a graph data structure? (A) Representing hierarchical data (B) Storing data in tables (C) Network routing (D) Managing tasks in a to-do list 19. Which of the following is a characteristic of a circular linked list? (A) The last node points to NULL (B) It can be traversed in one direction only (C) The last node points to the first node (D) It has a fixed size 20. What is the primary disadvantage of using a linked list compared to an array? (A) Memory overhead (B) Easier insertion (C) Better performance (D) Faster access time 21. Which data structure is used for breadth-first traversal? (A) Stack (B) Queue (C) Array (D) Linked List 22. What is the time complexity for searching an element in a balanced binary search tree? (A) O(1) (B) O(n) (C) O(log n) (D) O(n log n) 23. Which of the following data structures is used to implement a backtracking algorithm? (A) Stack (B) Queue (C) Hash Table (D) Tree 24. In a binary search tree, which of the following is true about the left and right subtrees? (A) The left subtree contains only nodes with values greater than the root (B) The right subtree contains only nodes with values less than the root (C) The left subtree contains only nodes with values less than the root (D) The right subtree contains only nodes with values greater than the root 25. Which of the following is NOT a valid operation for a stack? (A) Push (B) Pop (C) Enqueue (D) Peek 26. What is the time complexity of deleting an element from a singly linked list? (A) O(1) (B) O(n) (C) O(log n) (D) O(n log n) 27. Which data structure allows for the insertion and deletion of elements from both ends? (A) Stack (B) Queue (C) Deque (D) Linked List 28. What is the primary use of a trie data structure? (A) Implementing a priority queue (B) Storing strings (C) Performing quick searches (D) Storing integers 29. In which data structure is the first element to be inserted the first one to be removed? (A) Stack (B) Queue (C) Array (D) Linked List 30. What is the main characteristic of a red-black tree? (A) Every node is red (B) It is always balanced (C) It has a maximum height of 2 log(n) (D) It is a complete binary tree 31. Which of the following is NOT a valid tree traversal method? (A) Inorder (B) Preorder (C) Postorder (D) Crossorder 32. What is the worst-case time complexity for inserting an element into a hash table? (A) O(1) (B) O(log n) (C) O(n) (D) O(n log n) 33. Which of the following data structures is used to implement a priority queue? (A) Array (B) Stack (C) Binary Heap (D) Linked List 34. What type of data structure is a binary tree? (A) Linear (B) Non-linear (C) Hash-based (D) None of the above 35. Which of the following is true about a binary search tree? (A) All nodes are filled from left to right (B) Each node has at most two children (C) The left child is always smaller than the parent (D) Both B and C 36. What is the main disadvantage of a hash table? (A) It is slow (B) It uses more memory (C) It has poor average-case time complexity (D) It is not flexible 37. Which data structure is best suited for implementing an undo feature in applications? (A) Stack (B) Queue (C) Linked List (D) Array 38. What is the purpose of a sentinel node in a linked list? (A) To mark the end of the list (B) To simplify insertion and deletion (C) To hold the value of the list (D) None of the above 39. Which of the following is a property of a B-tree? (A) It is a binary tree (B) It is balanced (C) It allows for faster searches than a binary search tree (D) Both B and C 40. What is the main advantage of using an array over a linked list? (A) Dynamic sizing (B) Ease of implementation (C) Better memory locality (D) Flexibility Data Structures MCQs Basic Concepts Introduction to Data Structures Abstract Data Types (ADT) MCQs Complexity Analysis MCQs Time complexity MCQs Space complexity MCQs Big O, Big Ω, Big Θ notations MCQs Linear Data Structures MCQs Arrays MCQs One-dimensional arrays MCQs Multi-dimensional arrays MCQs Operations: traversal, insertion, deletion MCQs Linked Lists MCQs Singly linked list MCQs Doubly linked list MCQs Circular linked list MCQs Stacks MCQs Stack operations (push, pop, peek) MCQs Applications of stacks (expression evaluation, recursion) MCQs Queues MCQs Queue operations (enqueue, dequeue, front, rear) MCQs Types: Simple queue, circular queue, priority queue, deque MCQs Non-Linear Data Structures MCQs Trees MCQs Binary trees MCQs Binary Search Trees (BST) MCQs AVL Trees MCQs B-trees and B+ trees MCQs Tree traversal methods (in-order, pre-order, post-order) MCQs Heaps MCQs Min-heap MCQs Max-heap MCQs Heap operations (insertion, deletion, heapify) MCQs Applications of heaps (priority queues, heap sort) MCQs Graphs MCQs Graph representation (adjacency matrix, adjacency list) MCQs Graph traversal algorithms (DFS, BFS) MCQs Shortest path algorithms (Dijkstra’s, Bellman-Ford) MCQs Minimum Spanning Tree (Kruskal’s, Prim’s) MCQs Hashing MCQs MCQs Hash Tables Hash functions MCQs Collision resolution techniques (chaining, open addressing) MCQs Applications of hashing MCQs Sorting and Searching Algorithms MCQs Sorting Algorithms MCQs Bubble sort MCQs Selection sort MCQs Insertion sort MCQs Merge sort MCQs Quick sort MCQs Heap sort MCQs Searching Algorithms MCQs Linear search MCQs Binary search MCQs Interpolation search MCQs Miscellaneous Memory Management in data structures MCQs Dynamic memory allocation MCQs Garbage collection MCQs String Manipulation Algorithms MCQs Pattern matching (KMP, Rabin-Karp) MCQs String hashing MCQs Data Structures MCQs 1 Data Structures MCQs 2 Data Structures MCQs 3 Data Structures MCQs 4 Data Structures MCQs 5 Stacks Solved MCQs Queues MCQs pointer mcqs Array MCQs Related Posts:Difference between homologous structures and analogous structuresData Structures MCQsComputer Science Test MCQs, Data StructuresQueues MCQs Questions Answers - Data StructuresLinear Data Structures MCQsMemory Management in data structures MCQs