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Data Structures and Algorithms Objective Questions and Answers

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Test your data structures and algorithms skills with high-quality MCQs focused on problem-solving, complexity analysis, and real interview-level scenarios. Designed for developers and competitive programming practice.

Practice Data Structures and Algorithms MCQs with Detailed Explanations

Answer at least 12 questions to submit.

1.
Easy
What is the time complexity of accessing an element in an array by index?
2.
Easy
Which data structure is best suited for implementing recursion internally?
3.
Medium
What is the worst-case time complexity of linear search?
4.
Medium
Which traversal of a Binary Search Tree gives sorted output?
5.
Easy
What is the maximum number of children a binary tree node can have?
6.
Medium
What is the average-case time complexity of Quick Sort?
7.
Medium
Which data structure is used in Breadth First Search?
8.
Medium
What is the worst-case time complexity of inserting an element at the beginning of a linked list?
9.
Medium
Which algorithm technique is used in Merge Sort?
10.
Medium
What is the height of a balanced binary tree with n nodes?
11.
Medium
Which of the following problems is best solved using Dynamic Programming?
12.
Medium
What is the space complexity of Merge Sort?
13.
Hard
Which data structure is used to implement LRU cache efficiently?
14.
Medium
What is the time complexity of Heapify operation?
15.
Hard
Which graph algorithm is used to find the shortest path in a weighted graph with non-negative weights?
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