The Rana Pratap Sagar Dam is a gravity masonry dam of 53.8 metres height built on the Chambal River at Rawatbhata in Rajasthan in India. It was officially declared open on 9 February 1970 by Indira Gandhi, the then Prime Minister of India.

Correct Option: B

The Rana Pratap Sagar Dam is a gravity masonry dam of 53.8 metres height built on the Chambal River at Rawatbhata in Rajasthan in India. It was officially declared open on 9 February 1970 by Indira Gandhi, the then Prime Minister of India.

Meghna River is the combined stream of the Ganges and Brahmaputra. It is an important river in Bangladesh, one of the three that forms the Ganges Delta, the largest on earth fanning out to the Bay of Bengal.

Correct Option: D

Meghna River is the combined stream of the Ganges and Brahmaputra. It is an important river in Bangladesh, one of the three that forms the Ganges Delta, the largest on earth fanning out to the Bay of Bengal.

Immediately after independence, policy planners sought a solution to the recurring flood menace faced by people of North Bihar from the Kosi and other rivers flowing from Nepal to India. The Kosi project was thus conceptualized (based on investigations between 1946 to 1955), in three continuous interlinked stages. The third part envisaged a high multipurpose dam within Nepal at Barakshetra to provide substantial flood cushion along with large irrigation and power benefits to both countries.

Correct Option: D

Immediately after independence, policy planners sought a solution to the recurring flood menace faced by people of North Bihar from the Kosi and other rivers flowing from Nepal to India. The Kosi project was thus conceptualized (based on investigations between 1946 to 1955), in three continuous interlinked stages. The third part envisaged a high multipurpose dam within Nepal at Barakshetra to provide substantial flood cushion along with large irrigation and power benefits to both countries.

An estuary is an area where a freshwater river or stream meets the ocean. One of the major estuaries of the Ganges, the largest as well as longest river of Indian subcontinent, is the Hooghly estuary. It has a width of 3 to 12 km and is alive estuary supporting biodiversity and better known for its Hilsa fishery and the famous Sunderban mangroves.

Correct Option: A

An estuary is an area where a freshwater river or stream meets the ocean. One of the major estuaries of the Ganges, the largest as well as longest river of Indian subcontinent, is the Hooghly estuary. It has a width of 3 to 12 km and is alive estuary supporting biodiversity and better known for its Hilsa fishery and the famous Sunderban mangroves.

The Nagarjunasagar Dam is the world's largest masonry dam at the time of its construction, which is built across Krishna River at Nagarjunasagar in Guntur and Nalgonda districts of Andhra Pradesh. It was the earliest in the series of large infrastructure projects initiated for the Green Revolution in India; it also is one of the earliest multi-purpose irrigation and hydro-electric projects in India.

Correct Option: B

The Nagarjunasagar Dam is the world's largest masonry dam at the time of its construction, which is built across Krishna River at Nagarjunasagar in Guntur and Nalgonda districts of Andhra Pradesh. It was the earliest in the series of large infrastructure projects initiated for the Green Revolution in India; it also is one of the earliest multi-purpose irrigation and hydro-electric projects in India.