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 Biggest ocean in the world ?

Answer: Pacific ocean

3. Which is Largest railway route in India ?

Answer: Dibrugarh in Assam to Kannyakumari in Tamil Nadu.

4. Which is smallest and largest bird ?

Answer: Smallest Bird is Humming Bird and Largest bird is Ostrich

5. Which is the largest gulf ?

Answer: Gulf of Mexico

6. Which is the largest Zoo in India ?

Answer: Zoological Gardens, Alipur, Kolkata

7. Which Indian state is having longest coastline ?

Answer: Gujrat