1. Which is the longest rail tunnel in India ?

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

2. Which is the highest waterfall in the world ?

Answer: Angel, Venezuela

3. Which is the longest Platform ?

Answer:

Gorakhpur railway station, Uttar Pradesh, India (1355.40 meters)

4. 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.

5. Which is the lightest metal ?

Answer: Lithium

6. Which is Biggest ocean in the world ?

Answer: Pacific ocean

7. Which is the brightest planet ?

Answer: Venus