Which one of the following reservoirs is associated with Rihand Project ?

Concept: A dam/hydel project's name, the river it is built on, and the reservoir (artificial lake) it impounds can all carry different, separately-assigned names; GK questions of this kind test whether you can correctly match a named project to its actual reservoir.

Application: The Rihand Project is built on the Rihand River (a Sone tributary) in Sonbhadra district, Uttar Pradesh; its reservoir was officially named Govind Ballabh Pant Sagar, one of India's largest reservoirs by surface area.

Cross-check: The remaining names belong to other rivers entirely:

• Jawahar Sagar — reservoir on the Chambal River, Rajasthan, unrelated to the Rihand/Sone system.

• Gandhi Sagar — reservoir on the Chambal River, Madhya Pradesh, also unrelated.

• Govind Sagar — reservoir of the Bhakra Dam on the Sutlej River, Himachal Pradesh/Punjab, a different basin altogether.

Result: Since only Govind Ballabh Pant Sagar sits on the Rihand River in Sonbhadra, it is the reservoir associated with the Rihand Project.