RAS question
Parwan River is a tributary of which river?
Correct answer: (D) Kali Sindh.
The Parwan River is a tributary of the Kali Sindh River, which in turn is a tributary of the Chambal.
Explanation
Parwan should be placed under the Kali Sindh system, not directly under the Chambal or Banas systems. India-WRIS describes the Parwan River as an important tributary of Kalisindh and says it joins Kali Sindh near Ramgarh village in Kota district after entering Rajasthan from the Malwa Plateau side through Jhalawar district. Parwan flows through Jhalawar and Kota districts, the Parwan Dam is being built on it, and Kali Sindh itself later joins the Chambal. The hierarchy is therefore Parwan to Kali Sindh to Chambal, which is why the immediate answer is Kali Sindh.
Why the other options are wrong
- (A) Banas is listed as a major tributary of the Chambal, but India-WRIS identifies Parwan as a tributary of Kali Sindh, not Banas.
- (B) Mahi does not receive the Parwan; India-WRIS places Parwan under the Kali Sindh system.
- (C) Chambal is the larger downstream river because Kali Sindh is its tributary, but Parwan's immediate parent river is Kali Sindh.
Concept
This tests Rajasthan river-system hierarchy: knowing whether a river is an immediate tributary or part of a larger basin. Such questions recur in RAS because district geography, river basins and irrigation projects are frequently linked in prelims.