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Activated carbon uses and production — UPSC Prelims PYQ 2025Jeevan Bisht2025 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
Biofilters in Recirculating Aquaculture System — UPSC Prelims PYQ 2023Jeevan Bisht2023 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
Biological Oxygen Demand (BOD) — UPSC Prelims PYQ 2017Jeevan Bisht2017 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
UPSC Prelims PYQ 2017: Advantages of Bioremediation TechniquesJeevan Bisht2017 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
UPSC Prelims PYQ 2015: Bio-toilets on Indian Railways — correctness of statementsJeevan Bisht2015 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
Pollutants in drinking water (Arsenic, Fluoride, Uranium) — UPSC PYQ 2013Jeevan Bisht2013 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
Ocean acidification: causes of concern — UPSC Prelims PYQ 2012PMF IAS2012 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
What is Oilzapper? — UPSC Prelims PYQ 2011PMF IAS2011 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
UPSC Prelims PYQ 2011: Causes of harmful algal blooms in Indian seasPMF IAS2011 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
Red Tides — UPSC Prelims PYQ 1998 (Dinoflagellate Blooms)PMF IAS1998 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
How is water pollution in rivers measured? — UPSC Prelims PYQ 1998PMF IAS1998 / Environment / Pollution and Degradation / Water Pollution / UPSC Prelims PYQs
