RAS question
Wakal River is a tributary of which river?
Correct answer: (C) Sabarmati.
Wakal River is a tributary of the Sabarmati River.
Explanation
The CWC's Basin Details page for the Mahi & Tapi Basin Organisation lists Sabarmati as a major west-flowing inter-state river that drains into the Gulf of Khambhat and names Sei, Wakal, Harnav, Hatmati and Watrak as its main tributaries. This directly places Wakal in the Sabarmati river system, not in the Chambal, Mahi or Banas systems. On the Rajasthan side, Wakal flows from the Aravalli hills near Udaipur towards Gujarat. Wakal is therefore linked to Sabarmati, and the direction towards Gujarat fits Sabarmati's west-flowing basin context.
Why the other options are wrong
- (A) Chambal is wrong because CWC places Wakal under the Sabarmati basin, not under Chambal.
- (B) Mahi is wrong because the CWC page lists Mahi's main tributaries as Som, Anas and Panam, while Wakal is listed under Sabarmati.
- (D) Banas is wrong because CWC lists Banas tributaries separately, while Wakal appears in the Sabarmati tributary list.
Concept
This tests Rajasthan drainage-system identification: matching a tributary to its parent river. It recurs in RAS because river-basin pairings are compact map facts where one misplaced tributary changes the answer.