Physics
The velocity of falling rain drops attains a terminal value because of

Upward thrust due to air
Viscous force exerted by air
Surface tension
Air current

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Physics
Which of the following is not a property of heavy water ?

Density of heavy water is higher than that of ordinary water
Freezing point of heavy water is higher than that of ordinary water
It produces corrosion
Boiling point of heavy water is lower than that or ordinary water

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