90. Which is regarded as Bihar’s oldest river-valley irrigation project?
[Bihar D.El.Ed. (5 April, Shift 1), 2024]
(A) Son Project
(B) Gandak Project
(C) Kosi Project
(D) Damodar Project
Answer: (A) Son Project
Explanation: The Son canal system developed from nineteenth-century irrigation works around Dehri. Unlike several post-independence multipurpose schemes, this older system preceded modern dam-based development in the Bihar plains.
89. Which is India’s longest dam, including its associated dykes?
[WBPSC WBCS 2023 Mains (held 18 August 2024), 2024]
(A) Hirakud
(B) Bhakra–Nangal
(C) Nagarjuna Sagar
(D) Sardar Sarovar
Answer: (A) Hirakud
Explanation: Hirakud extends about 25.8 kilometres when the main dam and earthen dykes are counted together. It stands on the Mahanadi in Odisha and is different from Tehri, which is distinguished by height.
88. In which state is the Mettur Hydroelectric Project located?
[WBPSC WBCS 2023 Mains (held 18 August 2024), 2024]
(A) Andhra Pradesh
(B) Tamil Nadu
(C) Kerala
(D) Karnataka
Answer: (B) Tamil Nadu
Explanation: Mettur Dam is across the Cauvery in Tamil Nadu. The associated Stanley Reservoir helps supply irrigation in the fertile delta and supports a hydropower facility near the project.
87. Hirakud Dam stands on which river?
[WBPSC Food SI 2023 (held 16 March 2024), 2024]
(A) Godavari
(B) Krishna
(C) Cauvery
(D) Mahanadi
Answer: (D) Mahanadi
Explanation: Hirakud is on the Mahanadi near Sambalpur in Odisha. The dam was designed for flood moderation and reliable irrigation water and is also equipped to generate hydroelectric energy.
86. The Krishna Raja Sagara (KRS) Dam is located on which river?
[OSSSC Forest Guard (4 May, Shift 3), 2024]
(A) Krishna
(B) Godavari
(C) Cauvery
(D) Mahanadi
Answer: (C) Cauvery
Explanation: Krishna Raja Sagara Dam is across the Cauvery near Mandya in Karnataka. The reservoir is crucial to irrigation and municipal supply in the Mysuru region and is associated with the work of engineer M. Visvesvaraya.
85. Which dam forms part of the Damodar Valley Corporation?
[SSC MTS (30 September, Shift 2), 2024]
(A) Maithon
(B) Rihand
(C) Koyna
(D) Salal
Answer: (A) Maithon
Explanation: Maithon Dam is built across the Barakar River in the Damodar basin. It combines flood moderation, irrigation and hydropower objectives, unlike the other structures that are associated with different river systems.
84. In which district of Maharashtra is Ujani Dam located?
[Maharashtra Police Constable Aurangabad (7 July), 2024]
(A) Solapur
(B) Satara
(C) Pune
(D) Kolhapur
Answer: (A) Solapur
Explanation: Ujani, also known as Bhima Dam, is situated in Solapur district on the Bhima River. Its reservoir is an important source of irrigation water and supports supply for surrounding agricultural settlements.
2023 — 21 questions
83. Which four states are associated with the Sardar Sarovar Project’s benefits?
[SSC CGL Tier-I (14 July, Shift 4), 2023]
(A) Maharashtra, Madhya Pradesh, Chhattisgarh, Jharkhand
(B) Maharashtra, Madhya Pradesh, Gujarat, Rajasthan
(C) Gujarat, Punjab, Haryana, Rajasthan
(D) Gujarat, Rajasthan, Karnataka, Telangana
Answer: (B) Maharashtra, Madhya Pradesh, Gujarat, Rajasthan
Explanation: The four associated states are Gujarat, Madhya Pradesh, Maharashtra and Rajasthan. Their interests include water allocation, irrigation, municipal supply and power sharing under the Narmada Valley scheme.
82. Which group benefits from Sardar Sarovar on the Narmada?
[Bihar TRE 2.0 Upper Primary (9 December), 2023]
(A) Maharashtra, Gujarat, Andhra Pradesh, Madhya Pradesh
(B) Maharashtra, Madhya Pradesh, Gujarat, Rajasthan
(C) Karnataka, Gujarat, Madhya Pradesh, Rajasthan
(D) All the listed groups
Answer: (B) Maharashtra, Madhya Pradesh, Gujarat, Rajasthan
Explanation: Sardar Sarovar is a Narmada basin development involving Gujarat, Madhya Pradesh, Maharashtra and Rajasthan. The benefits and obligations differ among states, but these four are the recognised participating states.
81. Sardar Sarovar Dam is built across which river?
[Bihar TRE 2.0 Social Science (8 December), 2023]
(A) Krishna
(B) Narmada
(C) Cauvery
(D) Godavari
Answer: (B) Narmada
Explanation: Sardar Sarovar crosses the Narmada near Kevadia in Gujarat. It provides a major storage and distribution system for irrigation, drinking water and hydroelectric production.
