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 sidereal month may be defined as

the period in which the moon completes an orbit around the earth
None of these
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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