Physics
An oil drop spreads over water because

Oil is more viscous
Oil is lighter than water
Oil does not mix with water
water has a higher surface tension

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

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