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

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

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World Geography
The temperature inversion is

when the decrease in temperature or moisture or both takes place
All of these
whenever the normal decrease of atmospheric temperature or moisture or both change with height over
whenever the normal decrease of atmospheric temperature

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World Geography
Which among the following principle is used by Bats?

SONAR (Sound Navigation & Ranging
law of diffraction
RADAR (Radio Detective & Ranging
law of reflection

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