MCQ questions for class 6 Science Chapter 15 Air Around Us
Question 1: Which of the following gases is the most abundant in the Earth's atmosphere?
Oxygen
Carbon dioxide
Nitrogen
Hydrogen
Question 2: What is the percentage of oxygen in the Earth's atmosphere?
21%
31%
41%
51%
Question 3: Which of the following is a trace gas in the Earth's atmosphere?
Oxygen
Carbon dioxide
Nitrogen
Argon
Question 4: What is the primary source of oxygen in the atmosphere?
Plants
Animals
Rocks
Clouds
Question 5: What is the process by which plants release oxygen into the air?
Photosynthesis
Transpiration
Respiration
Digestion
Question 6: Which of the following gases is responsible for the greenhouse effect?
Oxygen
Carbon dioxide
Nitrogen
Methane
Question 7: What is the term for the layer of gases that surrounds the Earth?
Stratosphere
Exosphere
Troposphere
Atmosphere
Question 8: What is the role of the ozone layer in the atmosphere?
It absorbs ultraviolet radiation
It produces oxygen
It traps carbon dioxide
It releases heat
Question 9: Which of the following is a component of air?
Water vapor
Methane
Ozone
All of the above
Question 10: What is the term for the tiny solid particles present in the air?
Molecules
Atoms
Dust particles
Mist
Question 11: What is the process by which water vapor changes into liquid water?
Evaporation
Condensation
Transpiration
Precipitation
Question 12: Which of the following is an example of a natural source of air pollution?
Industrial emissions
Vehicle exhaust
Volcanic eruptions
Burning of fossil fuels
Question 13: What is the term for the movement of air from one place to another?
Wind
Breeze
Storm
Hurricane
Question 14: What is the instrument used to measure air pressure?
Thermometer
Barometer
Anemometer
Hygrometer
Question 15: Which of the following gases is responsible for the formation of acid rain?
Oxygen
Carbon dioxide
Sulfur dioxide
Methane
Question 16: What is the term for the layer of air that surrounds the Earth and supports life?
Stratosphere
Exosphere
Troposphere
Atmosphere
Question 17: Which of the following is a human-made source of air pollution?
Forest fires
Volcanic eruptions
Burning of fossil fuels
Decomposition of organic matter
Question 18: What is the term for the movement of air caused by the unequal heating of the Earth?
Wind
Breeze
Storm
Hurricane
Question 19: What is the unit of measurement for air pressure?
Degree Celsius
Pascal
Kilogram
Meter per second
Question 20: What is the term for the condition of the atmosphere at a specific place and time?
Weather
Climate
Temperature
Humidity
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