1. Which is longest tributary river of India ?

Answer: Yamuna

2. Which is largest Dome in India ?

Answer: Gol Gumbaz (Karnataka)

3. What is the name of tallest Animal ?

Answer: Giraffe

4. 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.

5. Which is the biggest country in Area ?

Answer: Russia

6. Which is Largest Dome in World ?

Answer: St. Peter's Basilica (Rome)

7. Which is smallest and largest bird ?

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