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 longest tributary river of India ?

Answer: Yamuna

3. Which is longest river in world ?

Answer: Nile, Africa

4. Which is Highest Gallantry Award in India ?

Answer: Paramveer Chakra

5. Which is Largest Dome in World ?

Answer: St. Peter's Basilica (Rome)

6. Longest rail tunnel in the world ?

Answer: Seikan Tunnel (Japan - 53.9 Km)

7. Which is largest Dome in India ?

Answer: Gol Gumbaz (Karnataka)