Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.
Both its limbs are of unequal length.
The level of the liquid in the two vessels are at the same height.

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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
They fall with same ultimate velocity
Their velocity increases and they fall with same velocity on the earth

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