Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

Decreasing the radius of the capillary tube
Increasing the radius of the capillary tube
None of these
Increasing the height of water in the vessel

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Physics
Siphon will fail to work if:

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

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