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

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

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World Geography
The main objective of multi-purpose river projects are

flood controls and making rivers navigable
All of these
power generation by constructing hydro power stations
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas

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