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A siphon will fail to work if

1. the densities of the liquid in the two vessels are equal
2. the level of the liquid in the two vessels are at the same height
3. both its limbs are of unequal length
4. the temperature of the liquids in the two vessels are the same

Correct answer: the level of the liquid in the two vessels are at the same height

Solution

A siphon works because of the difference in liquid levels between the two vessels, which creates a pressure difference. If both liquid levels are at the same height, there is no net driving force for flow. Therefore, the siphon fails to work.

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