Penna. Mine Officials' Exam Practice Tests
Gas Detection & Ventilation - Module 1

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Question 1 of 25

1.  A noxious gas is ____________, however it can be dangerous if it displaces oxygen.

Choices:
  1. Inert
  2. Explosive
  3. Non-poisonous
  4. Non-explosive

Need Help?
Here's a gas chart

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