1. Which is the longest rail tunnel in India ?

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

2. Which is Highest Gallantry Award in India ?

Answer: Paramveer Chakra

3. 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.

4. Which is the Densest populated State of India ?

Answer: West Bengal

5. Which is the largest Mosque in World ?

Answer: Masjid al Haram (Saudi Arabia)

6. Which is Longest road tunnel in the World ?

Answer: Lærdal Tunnel (Norway - 24.51 kilometre)

7. Which is the deepest lake of the world ?

Answer: Lake Baikal