1. Which is smallest planet ?

Answer: Mercury

2. Which is Largest Dome in World ?

Answer: St. Peter's Basilica (Rome)

3. Which is the longest Platform ?

Answer:

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

4. Which is Largest library in the world ?

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

5. Which is the largest sea in the world ?

Answer:

Philippine Sea

6. 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.

7. Which is longest railway station ?

Answer: Grand Central Terminal, Chicago(USA).