TASCO Exit Exam • Set 3 Question 22 of 30
For entering an enclosed space, 21% ___________ is necessary.
✓
Direct Answer
Option B: Oxygen
Normal atmospheric air contains approximately 21% oxygen. This concentration is the prerequisite for safe human entry into enclosed spaces to prevent hypoxia.
All Options
A
Nitrogen
B
Oxygen
(Correct Answer)
C
carbondioxide
Detailed Explanation & Context
Normal atmospheric air contains approximately 21% oxygen. This concentration is the prerequisite for safe human entry into enclosed spaces to prevent hypoxia.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Oil Tanker Cargo Operations (TASCO).
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