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UPSC 2008: Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?
(a)Hydrogen and oxygen
(b)Oxygen and acetylene
(c)Methane and air
(d)Carbon dioxide and methane
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Not attemptedCorrect Answer: (c) Methane and air
‘Firedamp’ in coal mines is nearly always methane (CH₄); when mixed with air (oxygen‐rich atmosphere) at 5–14 % concentration it becomes highly inflammable and is responsible for most underground mine explosions. Options with hydrogen-oxygen or carbon-dioxide mixtures are not typical mine hazards, and oxygen + acetylene is used in welding, not found naturally in mines. ([britannica.com](https://www.britannica.com/technology/mine-gas))
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Frequently Asked Questions
What is the correct answer to this UPSC 2008 Science & Technology question?▼
The correct answer is option (c): Methane and air. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Health & Diseases question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2008, GS Paper 1, as Question 115. It falls under Science & Technology > Health & Diseases.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Health & Diseases?▼
UPSC has asked 86 questions from Health & Diseases (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.