Physics
The bats can fly in the dark because

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

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
None of these
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The metal ball suffers greater change in momentum
Both suffer the same change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball
The rubber ball suffers greater change in momentum

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