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

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

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World Geography
The sidereal month may be defined as

None of these
the period in which the moon completes an orbit around the earth
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky
the period of rotation of moon

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