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 Indian state is having longest coastline ?

Answer: Gujrat

3. Longest rail tunnel in the world ?

Answer: Seikan Tunnel (Japan - 53.9 Km)

4. Which is the longest rail tunnel in India ?

Answer: Pir Panjal (J&k, 11215 metre)

5. Which is the largest Zoo in the World ?

Answer: Berlin Zoological Garden (Germany)

6. Which is Largest forest state of India ?

Answer: M.P.

7. Which is Largest Dome in World ?

Answer: St. Peter's Basilica (Rome)