1. Which is the lightest gas ?

Answer: Hydrogen

2. Which is the longest Platform ?

Answer:

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

3. Which is longest river of South India ?

Answer: Godavari

4. Which is the biggest museum in the world ?

Answer: British Museum, London

5. What is the name of brightest star ?

Answer: Sirius

6. Which is longest river of India

Answer: Ganges

7. Which is the shortest day in the year ?

Answer: December 22