Physics
The bats can fly in the dark because

They can see the objects in darkness
They generate flashes of light
They generate ultrasonic sound waves
They have weak legs and are likely to be attacked by predators

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Physics
Which of the following occurred first ?

Albert Einstein propounded the General Theory of Relativity
Guglielmo Marconi sent out the first wireless signals
Max Planck unveiled the Quantum Theory
Wright Brothers successfully flew an aircraft

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