Quick Answer
The answer is `from math import sqrt`. This is the most efficient import for a single function because it loads only the `sqrt` object into the current namespace, avoiding the overhead of importing the entire `math` module and reducing memory consumption. On the Certified Associate Python Programmer PCAP exam, this question tests your understanding of namespace management and import optimization—a common trap is choosing `import math` and then calling `math.sqrt()`, which works but wastes resources when you only need one function. The exam expects you to recognize that selective imports keep your code lean and prevent accidental name collisions with other modules. Remember the memory tip: “Import only what you use, or your namespace will bruise.”
This PCAP practice question tests your understanding of modules and packages. 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.
A programmer wants to use the sqrt function from the math module. Which import statement is most efficient?
from math import sqrt
Imports only the needed function.
import math.sqrt
Why wrong: Invalid syntax; sqrt is a function, not a submodule.
from math import *
Why wrong: Imports all names from math.
import math
Why wrong: Imports the whole module.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
from math import sqrt
Option A is correct because `from math import sqrt` imports only the `sqrt` function directly into the current namespace, avoiding unnecessary memory usage and name collisions. This is the most efficient approach when you need only a single function from a module, as it minimizes the import overhead and keeps the namespace clean.
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.
from math import sqrt
Why this is correct
Imports only the needed function.
Related concept
Read the scenario before looking for a memorised answer.
import math.sqrt
Why it's wrong here
Invalid syntax; sqrt is a function, not a submodule.
from math import *
Why it's wrong here
Imports all names from math.
import math
Why it's wrong here
Imports the whole module.
Common exam traps
Python Institute often tests the misconception that `import module.submodule` is valid syntax, when in fact Python requires `from module import submodule` or `import module` and then attribute access; the trap here is that candidates may think `import math.sqrt` works like a package import, but `math` is a module, not a package, and `sqrt` is a function, not a submodule.
Detailed technical explanation
When you use `from math import sqrt`, Python loads the entire math module into memory (as it must to access any of its functions), but only binds the name `sqrt` in the local namespace. This means the module object itself is still fully loaded, but the import statement avoids polluting the namespace with other names. In CPython, the import machinery caches modules in `sys.modules`, so subsequent imports of `math` from anywhere in the program reuse the same module object, but the efficiency gain from selective imports is primarily about namespace management and code clarity, not memory savings at the module level.
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Modules and Packages — study guide chapter
Learn the concepts, then practise the questions
Modules and Packages practice questions
Targeted practice on this topic area only
All PCAP questions
511 questions across all exam domains
Certified Associate Python Programmer PCAP study guide
Full concept coverage aligned to exam objectives
PCAP practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise PCAP questions linked to Modules and Packages.
Practise PCAP questions linked to Strings.
Practise PCAP questions linked to Object-Oriented Programming.
Practise PCAP questions linked to Exceptions and File I/O.
Practise PCAP questions linked to PCAP fundamentals.
Practise PCAP questions linked to PCAP scenario.
Practise PCAP questions linked to PCAP troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Modules and Packages — This question tests Modules and Packages — Read the scenario before looking for a memorised answer..
The correct answer is: from math import sqrt — Option A is correct because `from math import sqrt` imports only the `sqrt` function directly into the current namespace, avoiding unnecessary memory usage and name collisions. This is the most efficient approach when you need only a single function from a module, as it minimizes the import overhead and keeps the namespace clean.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
Last reviewed: Jun 30, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.