Physics
A galvanometer can be converted into a voltmeter by connecting with it a

High resistance in parallel
Low resistance in series
Low resistance on parallel
High resistance on series

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Physics
Siphon will fail to work if:

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

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