Question

As the amount of water in milk increases, the level of submergence of lactometer

A. Decreases
B. Remains unaffected
C. Increases
D. Unsure

Answer 1

Hint: A hydrometer is a device that works on the concept of buoyancy used to measure the relative density of liquids. A lactometer is a type of hydrometer. A lactometer is a device used to check the purity of the milk, basically the density of milk. In the case of milk, the density refers to the creaminess.

Complete answer:
Lactometer works on the principle of the specific gravity of milk (Archimedes principle).
The density of the milk decreases with the increase in the amount of water in the milk.

The level of submergence in a lactometer has a rating from 1 to 3. The uppermost marking W represents the density of the water and the lowermost marking M represents the density of the milk.

The purest milk will have reading near to the rating 1. As the amount of water in the milk increases, the milk will get the reading near to the rating 3.

The density of milk is inversely proportional to the amount of the water in milk.
Thus, with the increase in the amount of water in the milk, the level of submergence in a lactometer increases.
The lactometer is dipped in the sample milk. And is allowed to rest until cream forms in the milk. The thickness of the cream represents the density of the milk.

As the level of the submergence of the lactometer increases with the amount of water in the milk.

So, the correct answer is “Option C”.

Note:
The things to be on your figure tips for further information on solving these types of problems are:
The density of milk refers to the presence of lighter and heavier solid particles. The lactometer sinks in impure milk, whereas, the lactometer floats in pure milk.