1. Which is the longest River in the World ?

Answer: Nile

2. Which is the longest wall in world ?

Answer: Great wall of China

3. Which is Longest road tunnel in the World ?

Answer: Lærdal Tunnel (Norway - 24.51 kilometre)

4. Which is the largest Mosque in India ?

Answer: Jama Masjid (Delhi)

5. Which is the brightest planet ?

Answer: Venus

6. Which is Largest forest state of India ?

Answer: M.P.

7. 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.