Q. Which river is not a tributary of the Sarayu River?
Answer: Gomti
Notes: The Gomti River flows independently and joins the Ganga near Saidpur in Uttar Pradesh. The Sarayu River's main tributaries include Panar, East Ramganga, and Ladhia. Panar and Ladhia flow on the right bank, while East Ramganga is a left-bank tributary. The Gomti does not join the Sarayu at any point.