Physics
The boiling point of water decreases at higher altitudes is due to

High temprature
High atmospheric pressure
Low atmospheric pressure
Low temperature

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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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