Physics
Which physical quantity is measured in 'siemens'?

Magnetic flux
Refractive index
Electrical conductance
Electric potential

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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 temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.

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