The answer is to immediately disconnect the UPS from mains power and move it outside to a safe, well-ventilated area. This is the correct action because a strong sulfur smell combined with a warm casing is the classic sign of thermal runaway, a dangerous chain reaction where internal battery chemistry generates uncontrolled heat, releasing toxic hydrogen sulfide gas and posing a fire or explosion risk. On the CompTIA A+ Core 2 220-1202 exam, this scenario tests your understanding of safety procedures for hazardous hardware failures, often appearing as a trap where less experienced technicians might try to open the unit or simply unplug it without relocating it. Remember, the priority is to stop the charging current and remove the hazard from the building—never attempt to service a thermally runaway battery. A useful memory tip is “Smell and heat, take it to the street.”
220-1102 Environmental Awareness and Impact Practice Question
This 220-1202 practice question tests your understanding of environmental awareness and impact. 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 technician is called to a server room where a UPS battery is emitting a strong sulfur smell and the casing feels warm. What immediate action should the technician take?
Open the UPS to ventilate the battery compartment.
Why wrong: Opening the UPS could expose the technician to toxic fumes or cause a short circuit. This is unsafe.
B
Continue monitoring the UPS until it shuts down automatically.
Why wrong: Waiting for automatic shutdown risks a catastrophic failure. Immediate action is required.
C
Disconnect the UPS from the mains and move it outside to a safe area.
Removing the UPS from the building and isolating it from power reduces the risk of fire. This should be done with proper PPE and caution.
D
Spray the UPS with a fire extinguisher as a precaution.
Why wrong: Using a fire extinguisher prematurely may cause electrical damage and is not the first step. The priority is to disconnect and isolate the unit.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disconnect the UPS from the mains and move it outside to a safe area.
A strong sulfur smell and warm casing from a UPS battery indicate thermal runaway, a condition where internal chemical reactions generate excessive heat, potentially leading to fire or explosion. The immediate priority is to disconnect the UPS from mains power to stop charging and remove it to a safe, well-ventilated outdoor area to mitigate the risk of toxic gas release or catastrophic failure.
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.
✗
Open the UPS to ventilate the battery compartment.
Why it's wrong here
Opening the UPS could expose the technician to toxic fumes or cause a short circuit. This is unsafe.
✗
Continue monitoring the UPS until it shuts down automatically.
Why it's wrong here
Waiting for automatic shutdown risks a catastrophic failure. Immediate action is required.
✓
Disconnect the UPS from the mains and move it outside to a safe area.
Why this is correct
Removing the UPS from the building and isolating it from power reduces the risk of fire. This should be done with proper PPE and caution.
Related concept
Read the scenario before looking for a memorised answer.
✗
Spray the UPS with a fire extinguisher as a precaution.
Why it's wrong here
Using a fire extinguisher prematurely may cause electrical damage and is not the first step. The priority is to disconnect and isolate the unit.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that opening the UPS or using a fire extinguisher is a safe first response, when in fact the correct action is to isolate and remove the hazard to prevent escalation of thermal runaway.
Detailed technical explanation
How to think about this question
Lead-acid UPS batteries undergo thermal runaway when overcharging or internal short circuits cause excessive current flow, raising temperature and accelerating the exothermic chemical reaction. The sulfur smell is hydrogen sulfide (H₂S) gas, which is flammable and toxic, and the warm casing indicates the battery is venting hot gas. In a real-world scenario, a technician should isolate the UPS from both AC mains and connected loads, then move it outdoors to a non-combustible surface, allowing the battery to cool and vent safely without endangering personnel or equipment.
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 practitioner preparing for the 220-1202 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1202 question in full detail.
Environmental Awareness and Impact — This question tests Environmental Awareness and Impact — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Disconnect the UPS from the mains and move it outside to a safe area. — A strong sulfur smell and warm casing from a UPS battery indicate thermal runaway, a condition where internal chemical reactions generate excessive heat, potentially leading to fire or explosion. The immediate priority is to disconnect the UPS from mains power to stop charging and remove it to a safe, well-ventilated outdoor area to mitigate the risk of toxic gas release or catastrophic failure.
What should I do if I get this 220-1202 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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