Physics
Which one of the following is a non-dimensional quantity?

Plank's constant
Co-efficient of viscocity
Gas constant
Strain

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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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