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

Which of the following is a competent ignition source for a fire?

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. An electrical spark An electrical spark provides the heat energy needed to ignite a fuel-air mixture. Cold water, damp sand, and inert nitrogen do not supply ignition energy.

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