1. Which is longest river in world ?

Answer: Nile, Africa

2. Which is the longest wall in world ?

Answer: Great wall of China

3. Which is longest tributary river of India ?

Answer: Yamuna

4. Which is the lightest gas ?

Answer: Hydrogen

5. Which is the longest Platform ?

Answer:

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

6. Which is longest river of India

Answer: Ganges

7. Which is the largest desert in India ?

Answer: Thar (Rajasthan)