Which one of the following dams is constructed across Krishna River?

The Srisailam Dam is a major gravity and masonry dam constructed across the Krishna River [3]. It is located in the Nallamala Hills near the temple town of Srisailam, spanning a deep gorge between Andhra Pradesh and Telangana [3]. It serves as one of the largest hydroelectric power stations in India [3]. Regarding the other options, the Ukai Dam is built across the Tapi (Tapti) River in Gujarat. The Krishnaraja Sagar (KRS) Dam is constructed on the Cauvery River in Karnataka. The Mettur Dam is also located on the Kaveri (Cauvery) River in Tamil Nadu. Therefore, among the given choices, only the Srisailam Dam is situated on the Krishna River [1].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 3: The Drainage System of India > The Krishna > p. 21
2. [3] https://en.wikipedia.org/wiki/Srisailam_Dam