1. Which is the largest gulf ?

Answer: Gulf of Mexico

2. Which is largest Dam in World ?

Answer: Three Gorges (China)

3. Which is the longest rail tunnel in India ?

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

4. Which is largest Creature in world ?

Answer: Blue Whale

5. Which is longest river of South India ?

Answer: Godavari

6. Which is smallest continent of world ?

Answer: Australia

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.