Quick Answer
The correct choices are `'a' in 'abc'` and `'ab' in 'abc'`, both of which evaluate to `True`. The `in` operator in Python performs a substring membership test on strings, returning `True` if the left operand appears as a contiguous sequence of characters anywhere within the right operand. This is a fundamental concept tested on the Certified Associate Python Programmer PCAP exam, where you must distinguish between substring containment and element membership in other iterables like lists. A common trap is confusing `in` with the `find()` method or assuming it checks only single characters—in reality, `'ab' in 'abc'` works because `'ab'` is a valid substring starting at index 0. To remember, think of the `in` operator as asking "is this smaller string hiding inside the larger one?" and note that it returns `True` for any length of substring, not just individual characters.
This PCAP practice question tests your understanding of strings. 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 of the following expressions evaluate to `True`? (Select exactly two.)
'ab' in 'abc'
Substring 'ab' is in 'abc'.
'x' in 'abc'
Why wrong: Character 'x' is not in 'abc'.
'ab' not in 'abc'
Why wrong: 'ab' is in 'abc', so not in is false.
'a' in 'abc'
Substring 'a' is in 'abc'.
'abc' in 'ab'
Why wrong: 'abc' is longer than 'ab', so not a substring.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
'ab' in 'abc'
Option B is True because 'a' is at index 0; 'a' in 'abc' returns False because 'a' is a substring but 'a' is not a single element? Actually `'a' in 'abc'` checks if 'a' is a substring, which is True. Wait: Option B says `'a' in 'abc'` is True. Option C: `'ab' in 'abc'` is True. So both B and C are True. Option A: `'x' not in 'abc'` is True (x not in). That would be three. Let me adjust stem to have exactly two correct options. I'll change options. Let's find two that are True: Option B and Option C are both True. Option A is also True. So need to adjust. Let's replace one with False. For example, Option D: `'ab' not in 'abc'` is False. Option E: `'abc' in 'ab'` is False. So if we have B and C as True, A and D and E False. But we need exactly two correct. Let's set A to False: `'x' in 'abc'` is False. So then B and C are True. That works. I'll rewrite the options accordingly.
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.
'ab' in 'abc'
Why this is correct
Substring 'ab' is in 'abc'.
Related concept
Read the scenario before looking for a memorised answer.
'x' in 'abc'
Why it's wrong here
Character 'x' is not in 'abc'.
'ab' not in 'abc'
Why it's wrong here
'ab' is in 'abc', so not in is false.
'a' in 'abc'
Why this is correct
Substring 'a' is in 'abc'.
Related concept
Read the scenario before looking for a memorised answer.
'abc' in 'ab'
Why it's wrong here
'abc' is longer than 'ab', so not a substring.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Identify which PCAP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Strings — This question tests Strings — Read the scenario before looking for a memorised answer..
The correct answer is: 'ab' in 'abc' — Option B is True because 'a' is at index 0; 'a' in 'abc' returns False because 'a' is a substring but 'a' is not a single element? Actually `'a' in 'abc'` checks if 'a' is a substring, which is True. Wait: Option B says `'a' in 'abc'` is True. Option C: `'ab' in 'abc'` is True. So both B and C are True. Option A: `'x' not in 'abc'` is True (x not in). That would be three. Let me adjust stem to have exactly two correct options. I'll change options. Let's find two that are True: Option B and Option C are both True. Option A is also True. So need to adjust. Let's replace one with False. For example, Option D: `'ab' not in 'abc'` is False. Option E: `'abc' in 'ab'` is False. So if we have B and C as True, A and D and E False. But we need exactly two correct. Let's set A to False: `'x' in 'abc'` is False. So then B and C are True. That works. I'll rewrite the options accordingly.
Identify which PCAP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This PCAP 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 PCAP exam.
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