Physics
The force that binds the neutrons and protons in a nucleus is called as:

Weak Nuclear Force
Strong Nuclear Force
Electromagnetic Force
Gravitational Force

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Physics
Siphon will fail to work if:

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.
Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.

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