1. 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.

2. Which is Largest library in the world ?

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

3. Which is longest railway station ?

Answer: Grand Central Terminal, Chicago(USA).

4. Which is the smallest state of India by Population ?

Answer: Sikkim

5. Which is longest river of India

Answer: Ganges

6. Which Indian state is having longest coastline ?

Answer: Gujrat

7. Which is smallest planet ?

Answer: Mercury