UPSSSC PET 2023 (29 Oct Shift 2)
Lactometer works on which of the following principles/laws ?
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Answer: Option D — Archimedes' Principle
Detailed Solution
A lactometer is a kind of hydrometer that shows the purity of milk from its relative density; how far it sinks depends on the buoyant force, so it works on Archimedes' principle.
Pascal's principle applies to hydraulic machines, Bernoulli's principle to fluid flow and Newton's law to viscosity.
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Properties of Matter & Fluids — UPSSSC PET Preparation
This question tests your understanding of Properties of Matter & Fluids, a key topic in the UPSSSC PET General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
This topic covers the properties of solids and fluids: elasticity, pressure and its applications, Pascal's law, Archimedes' principle and buoyancy, floating and sinking, density, surface tension, capillary action, viscosity and Bernoulli's principle. Exams test everyday examples: a hydraulic lift works on Pascal's law, ships float because of Archimedes' principle, raindrops are spherical because of surface tension, and kerosene rises in a lamp wick by capillary action. Also know why it is easier to swim in sea water (greater density and buoyancy). Practise the properties of matter questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.