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

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

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World Geography
The temperature inversion is

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

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

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

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