3 / 20
The volume percentage of oxygen in the atmosphere is 21%, which..
  • A
    decreases with increasing altitude.
  • B
    increases with increasing altitude.
  • C
    is dependent on the present air pressure.
  • D
    is constant at all altitudes for conventional aircraft.

Composition of the Atmosphere

The atmosphere contains about 21% of oxygen. The other gases in the air are nitrogen, about 78%, and small amounts of carbon dioxide, water vapour and the rare gases such as argon. These volume percentages for each gases remain constant to about 70 000 ft - well within the altitudes at which conventional aircraft operate.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • Austro Control
    8
  • Sweden
    2
  • Azerbaijan
    1
  • France
    1
  • Poland
    1
  • Romania
    1
  • Serbia
    1
Keyboard Shortcut Use Keyboard Shortcuts