Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
The temperature of the liquids in the two vessels are the same.
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
Superconductors are those elements

Whose conductivity is intermediate between metals and insulators
Which turn into insulators at very low temperatures
Whose resistance falls almost to zero at very low temperatures
Which conduct electricity only at super-high temperatures

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Physics
The Hooke's law is valid for

Entire elastic region of the stress strain curve
Entire stress strain curve
Elastic as well as plastic region of the stress strain curve
Only proportional region of the stress strain curve

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