RAS question
Jawai River is a tributary of which river?
Correct answer: (D) Luni.
The Jawai River is a left-bank tributary of the Luni River in Rajasthan.
Explanation
Jawai is correctly linked with the Luni system. The official Hydrogeological Atlas of Rajasthan for the Luni River Basin states that Luni's main left-side tributaries include Sukri, Mithri, Bandi, Khari, Jawai, Guhiya and Sagi, while Jojari joins from the right. This directly places Jawai within the Luni basin, not the Mahi, Banas or Chambal systems. Jawai is also a major tributary of Luni, originating near Goriyo ki Naal in Pali district. For RAS, the key is to map Rajasthan's rivers by basin and direction: Jawai belongs to western Rajasthan's Luni drainage, where the Luni flows south-west and ultimately disappears in the Rann of Kutch.
Why the other options are wrong
- (A) Mahi is not the basin for Jawai; the official Luni basin atlas places Jawai among Luni's tributaries.
- (B) Banas is a separate basin to the east of the Luni basin, whereas Jawai is listed within Luni's tributary network.
- (C) Chambal belongs to eastern Rajasthan's drainage context, while Jawai is identified with the Luni basin.
Concept
This tests Rajasthan river-basin mapping, especially the tributaries of the Luni system. It recurs in RAS because west Rajasthan's inland and semi-arid drainage patterns are easy to confuse with the Banas, Chambal and Mahi systems.