1. 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.

2. Which is Largest Dome in World ?

Answer: St. Peter's Basilica (Rome)

3. Which is the highest waterfall in the world ?

Answer: Angel, Venezuela

4. Which is longest river in world ?

Answer: Nile, Africa

5. Which is the state largest by area in India ?

Answer: Rajasthan

6. Which is the longest River in the World ?

Answer: Nile

7. Which is the largest Zoo in the World ?

Answer: Berlin Zoological Garden (Germany)