1. Which is smallest state by area of India ?

Answer: Goa

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 smallest planet ?

Answer: Mercury

4. Which is the longest day in the year ?

Answer: June 21

5. Which is longest river of India

Answer: Ganges

6. Which is the lightest metal ?

Answer: Lithium

7. Which is largest Dam in World ?

Answer: Three Gorges (China)