Data Structures and Algorithms Objective Questions and Answers

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

What is the time complexity of accessing an element in an array by index?

Easy
2

Which data structure is best suited for implementing recursion internally?

Easy
3

What is the worst-case time complexity of linear search?

Medium
4

Which traversal of a Binary Search Tree gives sorted output?

Medium
5

What is the maximum number of children a binary tree node can have?

Easy
6

What is the average-case time complexity of Quick Sort?

Medium
7

Which data structure is used in Breadth First Search?

Medium
8

What is the worst-case time complexity of inserting an element at the beginning of a linked list?

Medium
9

Which algorithm technique is used in Merge Sort?

Medium
10

What is the height of a balanced binary tree with n nodes?

Medium
11

Which of the following problems is best solved using Dynamic Programming?

Medium
12

What is the space complexity of Merge Sort?

Medium
13

Which data structure is used to implement LRU cache efficiently?

Hard
14

What is the time complexity of Heapify operation?

Medium
15

Which graph algorithm is used to find the shortest path in a weighted graph with non-negative weights?

Hard