Important Dams and Projects

The correct answer is Sutlej. The Bhakra Nangal Project is a major multipurpose river-valley project constructed on the Sutlej River in the northern part of India. Its reservoir, Bhakra Dam, is associated with the Sutlej, while the Nangal works form part of the wider project system downstream. The project supports irrigation, hydroelectric power generation and regulation of river water. Thus option D is correct. Ravi, Beas and Chenab are also important rivers of the Indus basin, so they are plausible distractors, but they are not the river directly associated with the Bhakra Nangal Project. Remembering the pairing “Bhakra–Sutlej” prevents confusion with other Punjab and Himalayan river projects.

The correct answer is Tapi, also called the Tapti. Ukai Dam is a major multipurpose project built across the Tapi River in Gujarat. The reservoir is used for irrigation, hydroelectric power generation and control of river flows, making the project important for the region’s agriculture and water management. Therefore, option B is correct. Narmada is associated with major projects such as Sardar Sarovar, while Mahi and Sabarmati are separate rivers of western India with different courses and projects. The governing concept is the association of important dams with the rivers on which they are built. The useful examination pair is “Ukai–Tapi”; confusing it with Sardar Sarovar or other Gujarat-region projects leads to an incorrect answer.

The correct answer is Krishna. Nagarjuna Sagar Dam is a major multipurpose dam constructed across the Krishna River in the southern Deccan region. The project provides irrigation water and hydroelectric power and is important for agriculture in areas of present-day Telangana and Andhra Pradesh. Hence option A is correct. Godavari is another major peninsular river with separate projects, while Tungabhadra is a tributary of the Krishna and Kaveri belongs to a different river system. These similarities make the alternatives plausible, but they do not change the direct association of Nagarjuna Sagar with the Krishna. The key examination fact is the pair “Nagarjuna Sagar–Krishna River.”

Option A is correct because the Tungabhadra River is a major tributary of the Krishna River, and the Tungabhadra Dam is built on this tributary. The project is located in the southern Deccan region and supports irrigation, power generation and water management. The river system is determined by the parent river into which a tributary drains, so Tungabhadra belongs to the Krishna basin rather than the Ganga, Narmada or Brahmaputra basins. The Ganga and Brahmaputra systems are primarily associated with northern and northeastern drainage, while Narmada is a west-flowing central Indian river. Thus, the Krishna system is the precise answer.

The Bhakra-Nangal Project is a major multipurpose river-valley project on the Sutlej River, so option A is correct. The Bhakra Dam is constructed across the Sutlej in Himachal Pradesh, while the associated Nangal works are located downstream in Punjab. The project supports irrigation, hydroelectric power generation, and regulation and distribution of river water for parts of northwestern India. To answer the question, the project name must be matched with its river rather than with a state or a nearby canal. Gandak, Pennar, and Mahi are important Indian rivers, but the Bhakra-Nangal Project is not situated on any of them. The river-project association is a standard fact of Indian geography and does not require numerical calculation.