Data Structures MCQ
Data Structures MCQ Questions are designed to help you test and improve your understanding of key data structures and algorithms. These questions cover essential topics such as arrays, linked lists, stacks, queues, trees, graphs, and sorting algorithms. Whether you're a beginner, a student, or an experienced developer, these MCQs offer a great way to assess your knowledge and strengthen your problem-solving skills. Perfect for exam preparation, interviews, or enhancing your data structures knowledge, these questions will guide you in mastering the fundamentals of data structures and algorithms.
Q1. Which data structure uses FIFO (First In First Out) principle?
A. Stack
B. Queue
C. Array
D. Tree
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Q2. Which of the following is a LIFO (Last In First Out) data structure?
A. Queue
B. Stack
C. Heap
D. Graph
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Q3. Which data structure is best for implementing recursion?
A. Array
B. Stack
C. Queue
D. Linked List
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Q4. Which traversal is used in Binary Search Tree to get data in sorted order?
A. Preorder
B. Inorder
C. Postorder
D. Level order
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Q5. Which of the following is not a linear data structure?
A. Array
B. Linked List
C. Tree
D. Stack
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Q6. Which data structure is used for implementing BFS (Breadth First Search)?
A. Stack
B. Queue
C. Heap
D. Tree
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Q7. Which data structure is used for implementing DFS (Depth First Search)?
A. Queue
B. Stack
C. Heap
D. Array
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Q8. What is the worst-case time complexity of QuickSort?
A. O(n log n)
B. O(n^2)
C. O(log n)
D. O(n)
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Q9. Which of the following is an application of stack?
A. Undo in text editor
B. Call stack in recursion
C. Expression evaluation
D. All of the above
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Q10. Which data structure is used for implementing priority queue?
A. Stack
B. Heap
C. Array
D. Linked List
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Q11. Which hashing technique resolves collision by storing multiple elements in the same bucket?
A. Chaining
B. Open Addressing
C. Double Hashing
D. Linear Probing
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Q12. Which of the following is not a self-balancing binary search tree?
A. AVL Tree
B. Red-Black Tree
C. B-Tree
D. Binary Search Tree
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Q13. In a circular queue of size n, how many elements can be inserted?
A. n
B. n-1
C. n+1
D. Unlimited
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Q14. Which of the following is the fastest data structure for searching?
A. Array
B. Hash Table
C. Linked List
D. Queue
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Q15. Which of the following sorting algorithms is stable?
A. QuickSort
B. HeapSort
C. MergeSort
D. Selection Sort
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Q16. Which tree is used in database indexing?
A. Binary Tree
B. AVL Tree
C. B-Tree
D. Red-Black Tree
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Q17. Which data structure is used for backtracking algorithms?
A. Queue
B. Stack
C. Heap
D. Array
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Q18. Which traversal technique visits root node first, then left subtree, then right subtree?
A. Preorder
B. Inorder
C. Postorder
D. Level Order
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Q19. What is the height of a complete binary tree with n nodes?
A. O(n)
B. O(log n)
C. O(n log n)
D. O(1)
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Q20. Which operation is not allowed in a Queue?
A. Insertion at rear
B. Deletion at front
C. Insertion at front
D. Traversal
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