Physics
Materials for rain-proof coats and tents owe their water-proof properties to

elasticity
specific gravity
surface tension
viscosity

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

They fall with that ultimate velocity, which are different for different droplets
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

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