1. Which is longest tributary river of India ?

Answer: Yamuna

2. Which is the biggest country in Area ?

Answer: Russia

3. Which is Place of heaviest rainfall ?

Answer: Mausinram (Meghalaya)

4. Which is the Densest populated State of India ?

Answer: West Bengal

5. Which is Highest Gallantry Award in India ?

Answer: Paramveer Chakra

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 the longest day in the year ?

Answer: June 21