1. Longest rail tunnel in the world ?

Answer: Seikan Tunnel (Japan - 53.9 Km)

2. Which is the Largest lake of the world ?

Answer: Caspian Sea (371,000 sq km)

3. Which is the deepest lake of the world ?

Answer: Lake Baikal

4. Which is the highest waterfall in the world ?

Answer: Angel, Venezuela

5. Which is Highest Award in India ?

Answer: Bharat Ratna

6. Which is the biggest museum in the world ?

Answer: British Museum, London

7. 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.