Mettur Dam is Constructed on which river :

Every major dam in India is built across one specific river, and General Awareness questions on dams test the exact dam-river pairing rather than the general region — the key skill is recalling which particular river a named dam actually sits on.

The Mettur Dam is constructed directly across the Kaveri (Cauvery) river at Mettur in Salem district, Tamil Nadu. Built in the 1930s where the river enters the Tamil Nadu plains, it forms the Stanley Reservoir and supplies both irrigation to the Cauvery delta and hydroelectric power.

• Ganga — flows through the northern Indo-Gangetic plains from Uttarakhand to West Bengal; the major structure on it is the Farakka Barrage in West Bengal.

• Mahanadi — flows through Chhattisgarh and Odisha; the major structure on it is the Hirakud Dam in Odisha.

• Sutlej — flows through Himachal Pradesh and Punjab; the major structure on it is the Bhakra Dam, part of the Bhakra-Nangal project.

Only the Kaveri carries the Mettur Dam, confirming it as the correct answer.