Water purification
Water purification is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2018, 2020). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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Real questions that test this
पाण्यात क्लोरीन नेहमी मिसळतात कारण / Water is often treated with chlorine to
Chlorine is a powerful disinfectant used in water treatment to kill harmful disease-causing germs, bacteria, and microorganisms, ensuring safe drinking water.
खालीलपैकी कोणती विधाने अचूक आहेत ? / The correct statements from the following are :
(a)गाळणे ही भौतिक क्रिया आहे. / Filtration is a physical action.
(b)मातीमध्ये तयार झालेल्या ऑक्सिजनची वातावरणातील कार्बन डायऑक्साइड बरोबरची अदलाबदल तापमानावर अवलंबून असते. / The interchange of oxygen produced in soil and atmospheric carbon dioxide is temperature dependent.
(c)सांडपाणी, जमिनीची सुपीकता वाढवते. / Sewage increases the fertility of soil.
(d)सेंद्रिय पदार्थाचे अपघटन हे एरोबिक किंवा नॉनएरोबिक जीवाणू द्वारे होते. / Decomposition of organic matter by bacteria could be aerobic or Non-aerobic.
Statements (a), (c), and (d) are correct: filtration is a physical process, treated sewage can add nutrients to soil increasing fertility, and organic matter decomposes via aerobic or non-aerobic bacteria.