1. Which is largest Dome in India ?

Answer: Gol Gumbaz (Karnataka)

2. Which is the longest day in the year ?

Answer: June 21

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 Highest Battle field ?

Answer: Siachin Glacier. Mastguru team Salutes to Indian soldiers.

5. Which is the lightest gas ?

Answer: Hydrogen

6. Which is the largest Mosque in World ?

Answer: Masjid al Haram (Saudi Arabia)

7. Which is smallest planet ?

Answer: Mercury