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

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

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World Geography
The Penumbra is

the outer portion of the moon's shadow
None of these
both (a) and (b)
formed by the tangent that intersects between the sun and the moon

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