World Geography
Which among the following period in the demographic history of India is called the Period of Stable Population?

1981 to Present
1921 to 1951
1891 to 1921
1951 to 1981

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World Geography
The main objective of multi-purpose river projects are

power generation by constructing hydro power stations
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas
All of these
flood controls and making rivers navigable

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