1. Which is smallest and largest bird ?

Answer: Smallest Bird is Humming Bird and Largest bird is Ostrich

2. 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.

3. Which is the Densest populated State of India ?

Answer: West Bengal

4. Which is longest tributary river of India ?

Answer: Yamuna

5. Which is the longest Platform ?

Answer:

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

6. Where is largest Archipelago ?

Answer: Indonesia

7. Which is the longest River in the World ?

Answer: Nile