PCEP Control Flow, Loops, Lists and Logic Practice Question
This PCEP practice question tests your understanding of control flow, loops, lists and logic. 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 developer writes a while loop to count down from 10 to 1 and then stop. Which condition should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
while counter > 0:
Option D is correct because the while loop must continue as long as the counter is greater than 0, counting down from 10 to 1. When counter becomes 0, the condition `counter > 0` evaluates to False, and the loop terminates, stopping exactly at 1.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
while counter != 0:
Why it's wrong here
This works but is less explicit; also could be infinite if counter never hits 0 exactly due to step? In this case fine, but B is clearer.
✗
while counter >= 0:
Why it's wrong here
This includes 0, so it counts from 10 down to 0, not stopping at 1.
✗
while counter < 10:
Why it's wrong here
This would not decrement correctly; it would require an increment condition, not appropriate for countdown.
✓
while counter > 0:
Why this is correct
Correct: runs while counter is positive; stops when counter becomes 0.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the off-by-one error where candidates choose `>= 0` thinking they need to include 0, but the requirement to stop at 1 means the loop must not execute when counter is 0.
Detailed technical explanation
How to think about this question
In Python, a while loop evaluates the condition before each iteration; when counting down, using `>` ensures the loop runs exactly when the counter is positive. If the counter is decremented by 1 each time, `counter > 0` guarantees termination after 10 iterations (10, 9, ..., 1). A subtle behavior: if the counter is a float and decremented by a non-integer step, floating-point precision could cause the condition to behave unexpectedly, but with integers, it is safe.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Control Flow, Loops, Lists and Logic — This question tests Control Flow, Loops, Lists and Logic — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: while counter > 0: — Option D is correct because the while loop must continue as long as the counter is greater than 0, counting down from 10 to 1. When counter becomes 0, the condition `counter > 0` evaluates to False, and the loop terminates, stopping exactly at 1.
What should I do if I get this PCEP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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