1. Which is smallest planet ?

Answer: Mercury

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 longest Platform ?

Answer:

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

4. Which is the biggest museum in the world ?

Answer: British Museum, London

5. Which is the largest desert in India ?

Answer: Thar (Rajasthan)

6. Longest rail tunnel in the world ?

Answer: Seikan Tunnel (Japan - 53.9 Km)

7. Which is the state largest by area in India ?

Answer: Rajasthan