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Question

The principle upon which a lactometer works is

A
Viscosity
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B
Density
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C
Surface tension
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D
Presence of protein
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Solution

The correct option is B Density

Lactometer is basically a hydrometer which works as per Archimedes Principle. And Archimedes Principle states “any object partially or wholly immersed in a liquid is buoyed up or lifted up by a force, which is equal to the weight of the liquid displaced by the object”. Thus lower the density of milk, more the lactometer sinks. Buoyant force is the force acting upwards to reduce the actual weight of the object.


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