Physics
Which of the following principle is used to produce ''low-temperatures' ?

Adiabatic demagnetisation
Joule-Kelvin effect
Super conductivity
Thermo-electric effect

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Physics
Siphon will fail to work if:

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

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