Your Amazon purchases made using this link will benefit the United States Mine Rescue Association

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

Progress Indicator:
Question 1 of 25

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

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