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

They fall with same ultimate velocity
Their velocity increases and they fall with same velocity on the earth
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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Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Reach a particular height and start coming down
Continue going upwards uninterrupted
Burst after reaching some height

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