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Water Resources
Social Science · CBSE Class 10 · English Medium · 20 questions and answers
Sample questions
- Q: What percentage of the earth's surface is covered with water and how much is freshwater?
- A: About 71% of the earth's surface is covered with water, but only about 2.5% is freshwater (as fresh groundwater and surface water).
- Q: What is water scarcity mainly caused by?
- A: Water scarcity is mainly caused by over-exploitation, excessive use and unequal access to water among different social groups, and also by variations in seasonal or annual precipitation.
- Q: What is a dam?
- A: A dam is a barrier across flowing water that obstructs, directs or retards the flow, often creating a reservoir, lake or impoundment; dams are classified by structure, height or use.
- Q: Why did Jawaharlal Nehru call dams the 'temples of modern India'?
- A: Nehru proclaimed dams as the 'temples of modern India' because they would integrate development of agriculture and the village economy with rapid industrialisation and growth of the urban economy.
- Q: What are multi-purpose river projects?
- A: Projects where the many uses of the impounded water are integrated with one another, such as irrigation, electricity generation, flood control, water supply, navigation, fisheries and recreation.
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