1. Which is longest river of South India ?

Answer: Godavari

2. Which is longest river in world ?

Answer: Nile, Africa

3. Which is largest Dam in World ?

Answer: Three Gorges (China)

4. Which is the shortest day in the year ?

Answer: December 22

5. Which is highest dam in world ?

Answer:

Jinping-I Dam - 305 m (1,001 ft) in China on Yalong river.
Second Highest is Nurek Dam 300 m (980 ft) Tajikistan on Vakhsh river.

6. Which is the highest Plateau ?

Answer: Pamir, Tibet

7. Which is the largest gulf ?

Answer: Gulf of Mexico