Multiple choice

Mountaineers carry oxygen cylinders with them. What is the main reason to do so?

  1. Volume of oxygen increases with the altitude.

  2. Volume of oxygen decreases with the altitude.

  3. Due to the presence of nitrogen on high altitudes

  4. As the air becomes thick at high altitudes, breathing becomes difficult.

  5. Due to the presence of poisonous gases at high altitudes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. The volume of oxygen decreases with the rise in altitude. So, mountaineers carry oxygen cylinders.

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