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Natural Resources Practice Questions

Class 9 · Science · 3292 free MCQs with instant results and detailed explanations.

3292
Total
1002
Easy
1615
Medium
675
Hard

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Topics in Natural Resources

Soil 826
Water 822
Air 808
Biogeochemical Cycles 836

Sample Questions from Natural Resources

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the primary component of air?
A. Nitrogen
B. Oxygen
C. Carbon Dioxide
D. Hydrogen
Show Answer & Explanation
Correct Answer: A
Nitrogen makes up about 78% of the Earth's atmosphere, making it the primary component of air.
Q2
Easy
What is the approximate percentage of oxygen in the atmosphere?
A. 21%
B. 30%
C. 16%
D. 25%
Show Answer & Explanation
Correct Answer: A
Oxygen constitutes about 21% of the Earth's atmosphere, which is essential for life.
Q3
Easy
What happens to air pressure as altitude increases?
A. Increases
B. Decreases
C. Remains constant
D. Fluctuates
Show Answer & Explanation
Correct Answer: B
Air pressure decreases with an increase in altitude due to the lesser amount of air above.
Q4
Medium
What is the primary component of the air we breathe?
A. Oxygen
B. Nitrogen
C. Carbon Dioxide
D. Helium
Show Answer & Explanation
Correct Answer: B
Nitrogen makes up about 78% of the Earth's atmosphere, making it the primary component of air.
Q5
Medium
Which of the following gases is essential for photosynthesis?
A. Nitrogen
B. Oxygen
C. Carbon Dioxide
D. Argon
Show Answer & Explanation
Correct Answer: C
Plants use carbon dioxide during photosynthesis to produce glucose and oxygen.
Q6
Medium
Which of the following pollutants is most commonly associated with vehicle emissions?
A. Sulfur Dioxide
B. Carbon Monoxide
C. Nitrogen Oxides
D. Particulate Matter
Show Answer & Explanation
Correct Answer: B
Carbon monoxide is a colorless, odorless gas produced from incomplete combustion in vehicles.
Q7
Medium
What is the role of ozone in the Earth's atmosphere?
A. Pollutant
B. Greenhouse gas
C. UV radiation absorber
D. Supports combustion
Show Answer & Explanation
Correct Answer: C
Ozone in the stratosphere absorbs harmful ultraviolet radiation from the sun.
Q8
Hard
Which of the following statements correctly explains how the composition of air is affected by human activities?
A. Air composition remains constant regardless of human activities.
B. Burning fossil fuels increases carbon dioxide levels, altering air composition.
C. Deforestation decreases oxygen levels, making air less breathable.
D. Industrial activities do not impact the levels of nitrogen in the air.
Show Answer & Explanation
Correct Answer: B
Human activities such as burning fossil fuels release carbon dioxide into the atmosphere, which alters the natural balance of gases in the air.
Q9
Hard
What percentage of the Earth's atmosphere is composed of nitrogen?
A. 21%
B. 78%
C. 50%
D. 30%
Show Answer & Explanation
Correct Answer: B
Nitrogen makes up about 78% of the Earth's atmosphere, playing a crucial role in the nitrogen cycle.
Q10
Hard
Which gas is primarily responsible for the greenhouse effect?
A. Oxygen
B. Carbon Dioxide
C. Nitrogen
D. Argon
Show Answer & Explanation
Correct Answer: B
Carbon dioxide traps heat in the atmosphere, contributing significantly to the greenhouse effect.

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Natural Resources — Class 9 Science Practice Questions Online

This page contains 3292 practice MCQs for the chapter Natural Resources in Class 9 Science. The questions are organized by difficulty — 1002 easy, 1615 medium, 675 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.