MCQ
Mountaineers carry oxygen cylinders with them because:
- AOxygen supports combustion.
- ✓Oxygen is less at higher altitudes.
- CMore oxygen is needed to cook food.
- DOxygen does not support combustion.
✓
Answer
Correct option: B.
Oxygen is less at higher altitudes.
The density of air decreases with altitude, so the oxygen needed for breathing also decreases and becomes difficult to breathe. Hence, mountaineers carry oxygen cylinders.
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