1. Which is the longest wall in world ?

Answer: Great wall of China

2. Which is the longest day in the year ?

Answer: June 21

3. Which is largest Dam in World ?

Answer: Three Gorges (China)

4. Which is the smallest state of India by Population ?

Answer: Sikkim

5. Which is the longest Platform ?

Answer:

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

6. Which is the lightest gas ?

Answer: Hydrogen

7. Which is Longest road tunnel in the World ?

Answer: Lærdal Tunnel (Norway - 24.51 kilometre)