This PCEP practice question tests your understanding of computer programming and python fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements about Python lists are true?
Lists preserve the order of elements.
Lists are ordered.
Lists have a fixed size once created.
Why wrong: Lists can grow/shrink.
Lists can be modified after creation.
Lists are mutable.
Lists are immutable.
Why wrong: Lists are mutable.
All elements in a list must be of the same type.
Why wrong: Lists can hold different types.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Lists preserve the order of elements.
Option A is correct because Python lists are ordered collections that maintain the insertion order of elements. This means the sequence in which items are added is preserved, and you can access them by their index positions.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Lists preserve the order of elements.
Why this is correct
Lists are ordered.
Related concept
Read the scenario before looking for a memorised answer.
Lists have a fixed size once created.
Why it's wrong here
Lists can grow/shrink.
Lists can be modified after creation.
Why this is correct
Lists are mutable.
Related concept
Read the scenario before looking for a memorised answer.
Lists are immutable.
Why it's wrong here
Lists are mutable.
All elements in a list must be of the same type.
Why it's wrong here
Lists can hold different types.
Common exam traps
Python Institute often tests the misconception that lists are immutable or fixed-size, confusing them with tuples or arrays in other languages, and also tests the false assumption that all elements must be of the same type.
Detailed technical explanation
Under the hood, Python lists are implemented as dynamic arrays (specifically, arrays of PyObject pointers) that allocate extra capacity to allow efficient appends. When the list exceeds its allocated capacity, it triggers a resize operation (typically growing by ~12.5% or more) to accommodate new elements. This design enables O(1) amortized append time but also means lists can hold heterogeneous types because each element is a reference to an object.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCEP exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Computer Programming and Python Fundamentals — This question tests Computer Programming and Python Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: Lists preserve the order of elements. — Option A is correct because Python lists are ordered collections that maintain the insertion order of elements. This means the sequence in which items are added is preserved, and you can access them by their index positions.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This PCEP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCEP exam.
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