1. Which is largest Dam in World ?

Answer: Three Gorges (China)

2. Which is the highest waterfall in the world ?

Answer: Angel, Venezuela

3. Which is Longest road tunnel in the World ?

Answer: Lærdal Tunnel (Norway - 24.51 kilometre)

4. Which is biggest planet ?

Answer: Jupiter

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 longest day in the year ?

Answer: June 21

7. Which is the longest rail tunnel in India ?

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