Aviation Institute Of Maintenance (AIM) Block 1 Practice Test

Besides nitrogen and oxygen, approximately what fraction of the atmosphere is made up by all other gases combined?

1% 10% 5% 0.1%

Correct Answer:

Explanation:

The main idea is that the atmosphere is dominated by two gases, with all the rest making up only a small amount. By volume, nitrogen about 78% and oxygen about 21% leave roughly 1% for every other gas combined. That means trace gases such as argon, carbon dioxide, neon, helium, methane, krypton, hydrogen, and others together contribute about one percent of the air. CO2 itself is only around 0.04% and the rest of the trace gases add up to roughly the remaining small fraction, giving a total near one percent. The other options would imply a much larger or smaller share for all those minor gases, which doesn’t align with how the atmosphere is actually composed.

Access more questions from this quiz

Continue to Aviation Institute of Maintenance (AIM) Block 1 Practice Test for more practice questions and the full quiz experience.

Access More Questions