Chemistry: Environmental Chemistry: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question on Chemistry: Environmental Chemistry (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 1996Science and Technology · Chemistry: Environmental Chemistry
Q1. Physico-chemical characteristics of water in water sources undergo changes due to:
Explanation
The physico-chemical characteristics of water in water sources are primarily affected by effluents discharged from various sources, including industries, sewage, and agricultural runoff. Effluents introduce pollutants like organic matter, chemicals, heavy metals, and nutrients into water bodies, leading to significant changes in water quality. How Effluents cause Changes:
Chemical Changes: Effluents can alter the pH, increase the concentration of harmful chemicals, and introduce toxic substances. Nutrient Loading: Excessive nutrients (like nitrates and phosphates) from effluents can cause eutrophication, leading to algal blooms. Dissolved Oxygen Levels: Organic pollutants increase the Biological Oxygen Demand (BOD), reducing dissolved oxygen levels and harming aquatic life. Turbidity and Color: Effluents can increase turbidity, reduce light penetration, and alter the color of the water.
Answer key for these questions
Q
UPSC year
Correct answer
1
1996
(c) Effluents
Frequently asked questions
How many previous year UPSC questions are there on Chemistry: Environmental Chemistry?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Chemistry: Environmental Chemistry (Science and Technology), asked from 1996 to 2010. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Chemistry: Environmental Chemistry?
Questions on Chemistry: Environmental Chemistry (Science and Technology) are available for 5 years, from 1996 to 2010. Use the Year filter to practise a single paper.
