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WorksheetsAir Composition
Total questions: 15
Worksheet time: 15mins
Which of the following gases has the highest composition in the air?
Oxygen
Nitrogen
Inert gases
Carbon dioxide
Which of the following is the reason of the increase in carbon dioxide in the air?
I and II
I, II and III
I, II and IV
All of the above
What is observed in this activity?
Colour of flame
Production of heat
Level of water in the gas jar
Time taken for the candle to burn
Why air is classified as a mixture?
Separated by chemical method
Density of air is low
Air particles are difficult to separate
Separated by undergo fractional distillation process
What is the most common gas in the air?
Oxygen
Carbon Dioxide
Nitrogen
Water Vapor
What percentage of air is made up of oxygen?
78%
21%
1%
0.04%
Which gas in the air absorbs energy from sunlight?
Nitrogen
Oxygen
Carbon Dioxide
Water Vapor
What is the concentration of carbon dioxide in the air?
78%
21%
1%
0.04%
What is the effect of rising CO₂ concentration in the air?
Lower temperatures
Rising temperatures
No change in temperature
Decreased sunlight
Which gas is the second most abundant in Earth's atmosphere?
Oxygen
Nitrogen
Argon
Carbon Dioxide
What is the approximate percentage of nitrogen in the Earth's atmosphere?
21%
78%
1%
0.04%
Which of the following gases is primarily responsible for the greenhouse effect?
Nitrogen
Oxygen
Carbon Dioxide
Argon
Why is air considered a mixture rather than a compound?
It can be separated by physical means
It has a fixed composition
It is made of only one type of molecule
It undergoes chemical reactions
Which gas in the atmosphere is essential for photosynthesis?
Nitrogen
Oxygen
Carbon Dioxide
Argon
What is the role of ozone in the Earth's atmosphere?
Absorbs ultraviolet radiation
Provides oxygen for breathing
Contributes to the greenhouse effect
Acts as a pollutant
