RAS question
Berach River is a tributary of which river?
Correct answer: (A) Banas.
The Berach River is a major right-bank tributary of the Banas River in Rajasthan.
Explanation
Berach is linked to the Banas system, not to an independent western or southern river basin. Berach is a major tributary of the Banas, rising from the Gogunda Hills in Udaipur and joining the Banas near Bigod in Bhilwara. The Public Health Engineering Department, Government of Rajasthan's Banas River Basin report lists Berach among the major right-bank tributaries of the Banas, along with Menali. This is why the answer is Banas: the question is asking for Berach's direct parent river, and the official basin description places Berach inside the Banas drainage system.
Why the other options are wrong
- (B) Luni is ruled out because Berach is in the Banas system, while Luni belongs to the western side.
- (C) Chambal is not the direct answer here: Banas is a tributary of Chambal, while Berach is listed as a tributary of Banas.
- (D) Mahi is not related to Berach, which runs from Gogunda Hills to its confluence with the Banas near Bigod.
Concept
This tests Rajasthan drainage-system hierarchy: identifying a river by its immediate parent river, not by a larger downstream basin. Such tributary questions recur in RAS because river systems are a standard map-based part of Rajasthan geography.