Pollution of Air and Water MCQs Class 8
Pollution of Air and Water MCQs Class 8
Class: CBSE Class 8
Subject: Science
Section: 18 – Pollution of Air and Water
Topic: Pollution of Air and Water MCQs
Subject: Science
Section: 18 – Pollution of Air and Water
Topic: Pollution of Air and Water MCQs
Strictly Based on NCERT Syllabus | Ideal for CBSE Board Examinations
1. Presence of harmful substances in air is called:
Answer: B. Air pollution
Explanation: Air pollution occurs when harmful gases, smoke, and dust contaminate the air.
Explanation: Air pollution occurs when harmful gases, smoke, and dust contaminate the air.
2. Main gas responsible for global warming:
Answer: C. Carbon dioxide
Explanation: CO₂ traps heat in the atmosphere causing greenhouse effect.
Explanation: CO₂ traps heat in the atmosphere causing greenhouse effect.
3. Smog is a mixture of:
Answer: A. Smoke + Fog
Explanation: Common in polluted cities.
Explanation: Common in polluted cities.
4. Acid rain is caused by:
Answer: B. SO₂ & NO₂
Explanation: These gases form acids in clouds.
Explanation: These gases form acids in clouds.
5. Polluted water spreads:
Answer: A. Diseases
Explanation: Cholera, typhoid spread via contaminated water.
Explanation: Cholera, typhoid spread via contaminated water.
6. Main source of air pollution:
Answer: A. Vehicles
7. Ozone layer protects from:
Answer: B. UV rays
8. CFCs damage:
Answer: B. Ozone layer
9. Potable water means:
Answer: C. Drinkable
10. Ganga Action Plan aims to:
Answer: B. Clean Ganga
11. Polluted air affects:
Answer: D. All
12. Industrial waste pollutes:
Answer: D. All
13. Greenhouse effect causes:
Answer: B. Warming
14. Water pollutants include:
Answer: D. All
15. Pure air contains maximum:
Answer: B. Nitrogen
16. Noise pollution affects:
Answer: A. Hearing
17. Planting trees reduces:
Answer: D. All
18. Sewage treatment removes:
Answer: A. Pollutants
19. Main indoor air pollutant:
Answer: B. Smoke
20. Reducing pollution requires:
Answer: D. All
Explanation: Combined efforts are essential for pollution control.
Explanation: Combined efforts are essential for pollution control.
