With reference to the Himalayan rivers joining the Ganga downstream of Prayagraj from West to East, which one of the following sequences is correct ?
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Answer: B. Below Prayagraj the Ganga is joined from the north, going west to east, by the Gomati (near Ghazipur), the Ghaghara (near Chhapra), the Gandak (near Patna/Hajipur) and the Kosi (near Kursela in Bihar). So Gomati, Ghaghara, Gandak, Kosi.
Watch for: The Ghaghara is the bigger river, so students place it first; the Gomati actually meets the Ganga further west.
Why the other options are wrong
- A. Wrong because the Gomati joins the Ganga west of the Ghaghara.
- C. Wrong because Ghaghara and Gomati are reversed, and the Gandak joins before the Kosi.
- D. Wrong because the Gandak joins the Ganga west of the Kosi, not after it.
Source to check: NCERT Class 11 India: Physical Environment, Chapter 3 'Drainage System' (Ganga system)
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.