Which river is known as the Sorrow of Bihar?
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This question examines an important river-or-lake fact: “Which river is known as the Sorrow of Bihar?” The correct answer is Kosi. The Kosi River is known as the 'Sorrow of Bihar' because it frequently changes its course and causes devastating floods in Bihar every year. It originates in Tibet and flows through Nepal before entering Bihar. A river system includes its source, tributaries, distributaries, drainage basin, watershed, channel, floodplain, delta or estuary and final outlet. River behaviour depends on relief, geology, rainfall, snowmelt, sediment load, vegetation and human intervention. Examination questions often confuse a river’s source with its mouth, a left-bank tributary with a right-bank tributary, or a natural lake with a reservoir.