The JEE Main Chemistry section requires speed and accuracy, along with a thorough understanding of the Water pollution. This article provides a set of JEE Main PYQs on Water pollution to help you understand the topic and improve your problem-solving skills with the help of detailed solutions by ensuring conceptual clarity, which will help you in the JEE Main 2026 preparation.
Whether you're revising the basics or testing your knowledge, these JEE Main PYQs will serve as a valuable practice resource.
The JEE Main 2026 exam is likely to continue on the same pattern as JEE Main 2025. Out of 90 questions, students can expect a fair mix from all three subjects. To get an edge, going through JEE Main previous year questions (PYQs) is one of the best strategies.
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JEE Main PYQs on Water Pollution
1.
The water quality of a pond was analysed and its BOD was found to be 4. The pond has- Water has high amount of fluoride compounds
- Highly polluted water
- Very clean water
- Slightly polluted water
2.
The concentration of dissolved oxygen $(DO)$ in cold water can go upto :- 10 ppm
- 14 ppm
- 16 ppm
- 8 ppm
3.
Given below are two statements :
Statement I: In polluted water values of both dissolved oxygen and BOD are very low.
Statement II: Eutrophication results in decrease in the amount of dissolved oxygen.
In the light of the above statements, choose the most appropriate answer from the options given below :- Both Statement I and Statement II are true.
- Both Statement I and Statement II are false.
- Statement I is true but Statement II is false.
- Statement I is false but Statement II is true.
4.
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be $1000 \,ppb$, $40\, ppb$, $100\, ppm$ and $0.2\, ppm$, respectively. This water is unsuitable for drinking due to high concentration of :- Fluoride
- Lead
- Nitrate
- Iron
5.
The eutrophication of water body results in:- loss of Biodiversity.
- breakdown of organic matter.
- increase in biodiversity.
- decrease in BOD.
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