Physics
The mass of a star is two times the mass of the Sun. How it will come to an end ?

Red Giant
Black hole
White Dwarf
Neutron Star

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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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