1. Which is Longest Dam in India ?

Answer: Hirakod Dam (Orissa)

2. Which is largest Dome in India ?

Answer: Gol Gumbaz (Karnataka)

3. Which is the lightest metal ?

Answer: Lithium

4. Which is the Largest lake of the world ?

Answer: Caspian Sea (371,000 sq km)

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 biggest planet ?

Answer: Jupiter

7. Which is Largest forest state of India ?

Answer: M.P.