1. Which is largest Delta of India ?

Answer: Sundarban (W. Bengal)

2. Which is the highest Plateau ?

Answer: Pamir, Tibet

3. 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.

4. Which is the largest Zoo in India ?

Answer: Zoological Gardens, Alipur, Kolkata

5. Which is Longest road tunnel in the World ?

Answer: Lærdal Tunnel (Norway - 24.51 kilometre)

6. What is the name of brightest star ?

Answer: Sirius

7. Which state is largest by Population ?

Answer: Uttar Pradesh