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1. In which state is rooftop rainwater harvesting compulsory by law?

2. Which city practices widespread rooftop harvesting despite high rainfall?

3. How much annual precipitation does Gendathur village receive?

4. How much water can each Gendathur household collect annually?

5. What is the efficiency of rainwater collection in Gendathur village?

6. What is the local name for rainwater in Rajasthan?

7. Which system in Meghalaya uses bamboo pipes for irrigation?

8. How much water enters bamboo pipes per minute in Meghalaya’s system?

9. What is the main source of drinking water in arid Rajasthan during summer?

10. Which state’s capital faces acute water shortage despite highest rainfall nearby?

11. Which natural hazard can be triggered by multi-purpose dams?

12. What agricultural impact results from dams and irrigation projects?

13. What social change is linked with irrigation projects?

14. Which river is called the “river of sorrow” due to flooding?

15. Which project caused agitation among Sabarmati-basin farmers?

16. Which dam is built in the Mahanadi basin?

17. Which ancient city near Allahabad had a sophisticated water harvesting system?

18. Which Mauryan ruler encouraged building of dams and lakes?

19. Which artificial lake was built in the 11th century?

20. Who constructed the Hauz Khas tank in Delhi?