140. Which dam–river pairing in Odisha is correctly matched?
[OSSSC Forest Guard (30 April, Shift 1), 2026]
(A) Indravati–Krishna
(B) Balimela–Narmada
(C) Hirakud–Mahanadi
(D) Rengali–Godavari
Answer: (C) Hirakud–Mahanadi
Explanation: Hirakud is on the Mahanadi in western Odisha. Indravati lies on the Indravati system, Balimela on the Sileru and Rengali on the Brahmani, so the other pairings attach projects to incorrect rivers.
139. Across which river is Odisha’s Hirakud Dam built?
[OSSSC Forest Guard (24 April, Shift 1), 2026]
(A) Subarnarekha
(B) Baitarani
(C) Brahmani
(D) Mahanadi
Answer: (D) Mahanadi
Explanation: Hirakud crosses the Mahanadi just upstream of Sambalpur. Its storage assists flood management in the lower basin and provides water for agriculture and power production, making it a prominent post-independence multipurpose work.
138. Which is NOT a major hydroelectric power project?
[DSSSB MTS (28 July, Shift 2), 2026]
(A) Barauni
(B) Bhakra–Nangal
(C) Sardar Sarovar
(D) Tehri
Answer: (A) Barauni
Explanation: Barauni is associated with a coal-based thermal power station in Bihar rather than a hydroelectric dam. By contrast, Bhakra–Nangal, Sardar Sarovar and Tehri all use water stored or regulated by major river projects.
137. Which is NOT a normal objective of multipurpose river-valley projects?
[DSSSB Assistant Superintendent (12 July, Shift 3), 2026]
(A) Flood control
(B) Irrigation
(C) Inland navigation
(D) Nuclear power generation
Answer: (D) Nuclear power generation
Explanation: River-valley schemes use river storage and regulation for several compatible objectives, including irrigation, flood moderation, navigation where feasible and hydropower. Nuclear electricity requires a nuclear reactor; it is not generated directly from a dam’s water head.
136. Which Chambal structures are located in Rajasthan:
Rana Pratap Sagar,
Kota Barrage,
Jawahar Sagar and
Gandhi Sagar?
[RSMSSB Forester (28 June), 2026]
(A) First three only
(B) First, second and fourth
(C) Second and third only
(D) First and second only
Answer: (A) First three only
Explanation: Rana Pratap Sagar, Jawahar Sagar and Kota Barrage belong to the Rajasthan portion of the Chambal development system. Gandhi Sagar, the upstream major storage dam, is located in Madhya Pradesh.
135. Which hydroelectric project among the options is situated in Madhya Pradesh?
[DSSSB MTS (6 March, Shift 1), 2026]
(A) Indira Sagar
(B) Idukki
(C) Bhakra–Nangal
(D) Rihand
Answer: (A) Indira Sagar
Explanation: Indira Sagar lies on the Narmada in Madhya Pradesh, near Khandwa. Idukki is in Kerala, Bhakra–Nangal belongs to the Sutlej system in the northwest, and Rihand is in Uttar Pradesh.
134. Which is identified in the exam as the largest completed hydropower project of India?
[DSSSB Assistant Superintendent (2 July, Shift 1), 2026]
(A) Sardar Sarovar
(B) Bhakra–Nangal
(C) Tehri Complex
(D) Koyna Hydroelectric Project
Answer: (D) Koyna Hydroelectric Project
Explanation: The Koyna Hydroelectric Project in Maharashtra is an extensive multi-stage installation using water from the Koyna basin. Its large aggregate generating capacity makes it prominent among completed conventional hydropower schemes.
133. Match Hirakud, Nagarjuna Sagar, Bhakra–Nangal and Mettur with their rivers.
[DSSSB MTS (28 July, Shift 1), 2026]
(A) Mahanadi, Krishna, Sutlej, Cauvery
(B) Cauvery, Sutlej, Mahanadi, Krishna
(C) Cauvery, Krishna, Sutlej, Mahanadi
(D) Mahanadi, Sutlej, Krishna, Cauvery
Answer: (A) Mahanadi, Krishna, Sutlej, Cauvery
Explanation: Hirakud is built on the Mahanadi; Nagarjuna Sagar on the Krishna; Bhakra–Nangal on the Sutlej; and Mettur on the Cauvery. These four associations cover important river basins across eastern, southern and northern India.
132. Gandhi Sagar Dam has been constructed across which river?
[SECL Assistant Foreman (2 July, Shift 3), 2026]
(A) Narmada
(B) Son
(C) Sabarmati
(D) Chambal
Answer: (D) Chambal
Explanation: Gandhi Sagar is an upstream component of the Chambal Valley Project and lies in Madhya Pradesh. Together with downstream dams and the Kota Barrage, it supports hydropower production and irrigation development in the Chambal basin.
131. Which statement characterises the Mahanadi river system of Odisha?
[OSSSC Forest Guard (17 April, Shift 3), 2026]
(A) It hosts Hirakud and drains into the Bay of Bengal
(B) It flows into the Arabian Sea
(C) It is Odisha’s shortest river
(D) It rises on the Chota Nagpur Plateau
Answer: (A) It hosts Hirakud and drains into the Bay of Bengal
Explanation: The Mahanadi travels from Chhattisgarh through Odisha and empties into the Bay of Bengal. The Hirakud multipurpose project, located near Sambalpur, is a defining feature of its upper Odisha basin.
