Physics
As we go from Equator to North pole the value of ''g', the acceleration due to gravity

Remains the same
None of these
Increases
Decreases

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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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