Pollution of Air and Water Practice Questions
Class 8 · Science · 1213 free MCQs with instant results and detailed explanations.
1213
Total
373
Easy
600
Medium
240
Hard
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Topics in Pollution of Air and Water
Air Pollution
305
Greenhouse Effect
297
Purification
298
Water Pollution
313
Sample Questions from Pollution of Air and Water
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is a primary pollutant?
A.
A pollutant emitted directly from a source
B.
A pollutant formed by chemical reactions in the air
C.
A pollutant that is biodegradable
D.
A pollutant that is always harmful
Show Answer & Explanation
Correct Answer: A
A primary pollutant is released directly into the air from a source, like carbon monoxide from vehicles.
Q2
Easy
Which of the following gases is primarily responsible for causing acid rain?
A.
Carbon dioxide
B.
Sulfur dioxide
C.
Nitrogen
D.
Oxygen
Show Answer & Explanation
Correct Answer: B
Sulfur dioxide reacts with water vapor in the atmosphere to form sulfuric acid, leading to acid rain.
Q3
Easy
Which activity is a major contributor to air pollution in urban areas?
A.
Planting trees
B.
Using public transport
C.
Burning fossil fuels
D.
Recycling materials
Show Answer & Explanation
Correct Answer: C
Burning fossil fuels releases pollutants like carbon monoxide and particulate matter into the air, significantly contributing to urban air pollution.
Q4
Medium
Which of the following is a primary pollutant found in the air?
A.
Carbon monoxide
B.
Ozone
C.
Nitrogen dioxide
D.
Sulfuric acid
Show Answer & Explanation
Correct Answer: A
Carbon monoxide is a primary pollutant as it is directly emitted from sources like vehicle exhaust. Ozone, on the other hand, is a secondary pollutant formed from other pollutants.
Q5
Medium
What is the main source of sulfur dioxide in the atmosphere?
A.
Vehicle emissions
B.
Industrial processes
C.
Agricultural activities
D.
Household cleaning agents
Show Answer & Explanation
Correct Answer: B
The main source of sulfur dioxide is industrial processes, particularly from burning fossil fuels containing sulfur. Vehicle emissions primarily produce nitrogen oxides.
Q6
Medium
How does air pollution contribute to climate change?
A.
Increases rainfall
B.
Causes global warming
C.
Reduces ozone layer
D.
Promotes photosynthesis
Show Answer & Explanation
Correct Answer: B
Air pollution contributes to climate change primarily through greenhouse gases, which trap heat in the atmosphere leading to global warming.
Q7
Medium
Which of the following effects is NOT caused by air pollution?
A.
Respiratory diseases
B.
Acid rain
C.
Global warming
D.
Increased soil fertility
Show Answer & Explanation
Correct Answer: D
Air pollution can lead to respiratory diseases, acid rain, and global warming, but it does not increase soil fertility; in fact, pollution can harm soil health.
Q8
Hard
Which of the following pollutants is primarily responsible for the formation of acid rain?
A.
Carbon Dioxide
B.
Sulfur Dioxide
C.
Ozone
D.
Nitrogen Oxide
Show Answer & Explanation
Correct Answer: B
Sulfur dioxide reacts with water vapor in the atmosphere to form sulfuric acid, leading to acid rain.
Q9
Hard
What is the primary source of particulate matter (PM2.5) in urban areas?
A.
Industrial emissions
B.
Natural dust storms
C.
Vegetation
D.
Volcanic eruptions
Show Answer & Explanation
Correct Answer: A
Industrial emissions release fine particles into the air, contributing significantly to PM2.5 levels in urban areas.
Q10
Hard
Which of the following best describes the greenhouse effect?
A.
Heat is trapped by greenhouse gases
B.
Ozone layer depletion
C.
Increase in solar energy
D.
Decrease in Earth's albedo
Show Answer & Explanation
Correct Answer: A
The greenhouse effect occurs when greenhouse gases trap heat in the Earth's atmosphere, leading to temperature increases.
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Pollution of Air and Water — Class 8 Science Practice Questions Online
This page contains 1213 practice MCQs for the chapter Pollution of Air and Water in Class 8 Science. The questions are organized by difficulty — 373 easy, 600 medium, 240 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.