NCFE Review #1 Air/Air Pressure/Atmosphere

78% of the gas that makes up the atmosphere is ________? 

• Oxygen 
• Ozone 
• Nitrogen 
• Carbon Dioxide

What does the air consist of?

• molecules
• helium
• density
• weather

Which of the following is the second major gas that makes up the atmosphere, about 21%? 

• Nitrogen 
• Oxygen 
• Carbon Dioxide 
• Carbon Monoxide 

What happens to the amount of oxygen molecules as altitude increases?

• fewer molecules
• more molecules
• same amount of molecules
• nothing happens to the molecules

___________is the result of the weight of a column of air pushing on an area.

• air pressure
• density
• volume
• none of the above

In what direction(s) does air exert pressure?

• everywhere
• no where
• there is no pressure
• downward

Density of air is greater ________.

• at the top of the mountain
• at the bottom of the mountain
• at the center of the mountain

Air pressure is greater _______.

• at the top of the mountain
• at the bottom of the mountain
• at the center of the mountain

This tool is used to measure air pressure

• Mercury Barometer 
• Aneroid Barometer 
• Both are correct

How many layers are there to the atmosphere? 

• 3
• 4
• 5
• 6