Physics
What is the reason for twinkling of stars ?

Atmospheric reflection
Total internal reflection
Dispersion of light
Atmospheric refraction

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

Their velocity increases and they fall with same velocity on the earth
They fall with same ultimate velocity
Their velocity increases and they fall with different velocity on the earth
They fall with that ultimate velocity, which are different for different droplets

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