UPSC NDA I 2021 General Ability Solved Paper

The correct answer is river Mahananda.
Key Points
- Mahananda river is an important tributary of Ganga river.
- It flows in the region of northern India and Bangladesh.
- It rises in the Darjiling hills in extreme northern West Bengal state.
- The river flows south through a rich agricultural area in Bihar state, enters West Bengal state, and then in Bangladesh to join the Ganga river.