Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
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.

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Physics
The nature of fuse wire is

High resistance and high melting point.
Low resistance and low melting point.
Low resistance and high melting point.
High resistance and low melting point.

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