1. Which is longest railway station ?

Answer: Grand Central Terminal, Chicago(USA).

2. Which is longest river of South India ?

Answer: Godavari

3. Which is the Densest populated State of India ?

Answer: West Bengal

4. Which is the largest Mosque in World ?

Answer: Masjid al Haram (Saudi Arabia)

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 state is largest by Population ?

Answer: Uttar Pradesh

7. What is the name of tallest Animal ?

Answer: Giraffe