1. 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.

2. Which is the longest rail tunnel in India ?

Answer: Pir Panjal (J&k, 11215 metre)

3. Which state is largest by Population ?

Answer: Uttar Pradesh

4. Which is the lightest metal ?

Answer: Lithium

5. Which is the longest road in India ?

Answer: Grand Trunk Road (2500 Km)

6. Which is Place of heaviest rainfall ?

Answer: Mausinram (Meghalaya)

7. Which is longest river of South India ?

Answer: Godavari