1. What is the name of brightest star ?

Answer: Sirius

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 largest gulf ?

Answer: Gulf of Mexico

4. Which is the lightest gas ?

Answer: Hydrogen

5. Which is longest railway station ?

Answer: Grand Central Terminal, Chicago(USA).

6. Which is largest Creature in world ?

Answer: Blue Whale

7. Which is Largest railway route in India ?

Answer: Dibrugarh in Assam to Kannyakumari in Tamil Nadu.