1. Which is smallest continent of world ?

Answer: Australia

2. Which is largest continent ?

Answer: Asia

3. Which is smallest state by area of India ?

Answer: Goa

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 the largest Mosque in World ?

Answer: Masjid al Haram (Saudi Arabia)

7. Which is the largest Zoo in the World ?

Answer: Berlin Zoological Garden (Germany)