1. For purifying drinking water alum is used

2. The theory that a single dominant power can maintain world peace is called?

3. The United Nations' (UN) International Day of Peace is celebrated on September 21 since

4. Suez canal was nationalized by Egypt on

5. What material is used to coat iron in the galvanizing process?

6. Infrared radiations from the Sun are strongly absorbed by?

7. Operation Enduring Freedom (OEF) was conducted by the US in

8. Operation Gibraltar resulted into which war

9. Ecology is the study of

10. Martin Luther King Jr was assassinated in the age of

11. The Relative humidity depends upon

12. The latitude 'AA' on the map represents the

13. The Shahnama or Book of Kings was written by?

14. World Water Day is celebrated every year on

15. Galileo's most famous invention was

16. The largest part of our hydrosphere is

17. Friction can be reduced by changing from

18. The self-interest perused by individuals causing collective destruction is called theory of

19. Operation Desert Shield was launched by US in

20. Ozone layer absorbs most of the