1. Which is the largest Mosque in World ?

Answer: Masjid al Haram (Saudi Arabia)

2. Which is the largest Zoo in the World ?

Answer: Berlin Zoological Garden (Germany)

3. Which is the highest waterfall in the world ?

Answer: Angel, Venezuela

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

Answer: Rajasthan

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 Indian state is having longest coastline ?

Answer: Gujrat

7. Which is the longest rail tunnel in India ?

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