HomeUS Firefighter Exam Prep 2026Question 6 of 10
Basic Fire ScienceQuestion 6 / 10

In the fire triangle, oxygen acts as the:

Practise this US Firefighter question free, then download the PDF, watch the video walkthrough, or unlock timed mock exams for the full web bank.
Download PDFWatch video
Multiple choice — select the best answer
✓ Correct answer: B. Oxidizing agent that supports combustion Oxygen is the oxidizer that combines with fuel during combustion. It supports the reaction but is not itself the fuel or the heat source.

Keep practising. Use the free US Firefighter PDF, watch the YouTube walkthrough, or unlock all 10 web questions with timed mock exams.

Free PDFVideo walkthrough
Topic: Basic Fire Science
Keep practising

Related questions — Basic Fire Science

Free practice here. Timed mocks when you are ready.

Study the US Firefighter Exam Prep 2026 free question explanations, download the PDF, then unlock timed mock exams on the web when you want exam-day practice.

Download PDFStart practice test