RAS question
Gambhiri Dam is on which river?
Correct answer: (D) Gambhiri.
Gambhiri Dam is built across the Gambhiri River in Chittorgarh district of Rajasthan.
Explanation
Gambhiri Dam is on the Gambhiri River, not merely near it or named after a separate place. The official environmental examination for the Nimbahera water-supply subproject identifies the Gambhiri Medium Irrigation Project as being across the Gambhiri river, a tributary of the Banas river, and locates the dam in Nimbahera tehsil of Chittorgarh district. This matches the exam explanation that places Gambhiri Dam near Chittorgarh and links it with drinking-water supply. The key RAS trap is to separate the river on which the dam stands from the larger river system: Banas is relevant as the parent river, but the dam itself is across Gambhiri.
Why the other options are wrong
- (A) Banas is the larger river system because Gambhiri is described as its tributary, but the dam itself is across the Gambhiri River.
- (B) Chambal is not the river named for the Gambhiri Medium Irrigation Project, whose official description places it across the Gambhiri River.
- (C) Berach is a separate river in the Chittorgarh region, while the cited dam entry identifies the project with the Gambhiri River.
Concept
This tests Rajasthan drainage and dam-location mapping, a recurring RAS Geography area because questions often pair irrigation or drinking-water structures with their exact rivers. The confusion usually comes from tributary relationships, so the precise river of the dam matters.