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Environmental Impact Assessment (EIA)

1 UPSC Prelims MCQs tagged "Environmental Impact Assessment (EIA)". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

Agriculture and Allied Activities 56 Money, Banking and Monetary Policy 43 Environmental Pollution 43 Biotechnology 37 Parliament 33 Climate Change 32 Finance and Financial Markets 29 Emerging Technologies 28 Trade and External Sector 26 Life Sciences 26 Core Concepts and Foundational Science 20 Public Finance in India 19 International Environmental Framework 18 Continents 18 Religions in India 18 Fundamental Rights 18 Concept and Salient Features of the Constitution 17 Indian Biodiversity - Fauna 17 Renewable Energy 16 Major Physical Divisions of India 16 Multilateral Groupings 16 International Institutions 15 Art and Architecture 15 Drainage System 15 Institutional Measures for Environment Conservation 14 Regional Groupings 14 Rivers and Drainage 14 Infrastructure and Investment Models in India 14 Atmosphere 13 Space Technology 13

  1. Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds?…

    Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? 1. Decreased salinity in the river 2. Pollution of groundwater 3. Lowering of the water-table Select the correct answer using the code given below :

    1. A1 only
    2. B2 and 3 only
    3. C1 and 3 only
    4. D1, 2 and 3
    Answer and explanation

    Correct answer: B

    Statement 1 is Incorrect: Sand mining does not decrease salinity. In coastal and estuarine regions, excessive sand mining can lead to saltwater intrusion from the sea into the river system, which actually increases the salinity of the river water.

    Statement 2 is Correct: River sand acts as a natural filter for water percolating through the riverbed. Removing this sand layer reduces the filtration capacity, allowing pollutants, heavy metals, and contaminants to seep more easily into the underlying groundwater aquifers.

    Statement 3 is Correct: Heavy sand mining causes riverbed incision (deepening of the river channel). As the riverbed drops, the surrounding groundwater drains into the deepened channel to maintain hydrological equilibrium, leading to a significant lowering of the water table in the adjacent areas.

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    Environment UPSC 2018 Medium