1. Which is the longest rail tunnel in India ?

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

2. Which is Longest road tunnel in the World ?

Answer: Lærdal Tunnel (Norway - 24.51 kilometre)

3. Which is the largest gulf ?

Answer: Gulf of Mexico

4. Which is longest tributary river of India ?

Answer: Yamuna

5. Which is Largest library in the world ?

Answer: United State Library of Congress, Washington D.C.

6. Which is the longest Platform ?

Answer:

Gorakhpur railway station, Uttar Pradesh, India (1355.40 meters)

7. Which is Largest Dome in World ?

Answer: St. Peter's Basilica (Rome)