1. Which is Largest library in the world ?

Answer: United State Library of Congress, Washington D.C.

2. Which is biggest planet ?

Answer: Jupiter

3. Which is the highest Plateau ?

Answer: Pamir, Tibet

4. Which is longest railway station ?

Answer: Grand Central Terminal, Chicago(USA).

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 longest river in world ?

Answer: Nile, Africa

7. Which is the largest sea in the world ?

Answer:

Philippine Sea