Objective Type Questions on Data Structures in Python

Here are some objective type (multiple choice) questions to test your knowledge of data structures in Python. Good for interview preparation, exams, or self-practice.

1. Which of the following is a mutable data structure in Python?

A) Tuple
B) List
C) String
D) FrozenSet

Answer: B) List

2. What is the time complexity of accessing an element in a Python list by index?

A) O(1)
B) O(log n)
C) O(n)
D) O(n log n)

Answer: A) O(1)

3. Which data structure in Python uses a Last In First Out (LIFO) principle?

A) Queue
B) Stack
C) Dictionary
D) Set

Answer: B) Stack

4. In Python, which of the following is NOT a valid method of a list?

A) append()
B) pop()
C) enqueue()
D) insert()

Answer: C) enqueue()

5. Which of the following data structures preserves insertion order (from Python 3.7+)?

A) dict
B) set
C) list
D) Tuple

Answer: A) dict

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Author: Global Ranker • Updated: Sep 14, 2025