PCPP1 Advanced Object Oriented Programming Practice Question
You are implementing the Observer pattern. Why should you avoid using a strong reference to the observers in the subject's list?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It prevents the observer from being garbage collected when it is no longer needed.
Strong references prevent garbage collection of the observers, leading to memory leaks if observers are meant to be temporary.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It causes circular dependency issues.
Why it's wrong here
While possible, memory leaks are the primary concern in the Observer pattern context.
- ✗
It makes the notify method thread-unsafe.
Why it's wrong here
Strong references don't inherently affect thread safety.
- ✗
It violates the principle of encapsulation.
Why it's wrong here
Encapsulation concerns are secondary to resource management.
- ✓
It prevents the observer from being garbage collected when it is no longer needed.
Why this is correct
Weak references allow the garbage collector to reclaim the observer even if it's in the subject's list.
About these practice questions
Courseiva writes every PCPP1 question from scratch — 209 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP1 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 PCPP1 exam.