Which method is used to separate butter from cream? & x20; - RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

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Appeared in: RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

Explanation

Centrifugation is a mechanical process that uses centrifugal force to separate particles from a solution based on their size, shape, and density.
Cream is an emulsion of less-dense fat globules (butterfat) suspended in a denser water-based liquid (buttermilk).
When cream is spun at high speeds in a centrifuge, the denser liquid is forced outward, while the less-dense fat globules migrate inward, allowing for effective separation.

Option A: Titration is a laboratory method for quantitative chemical analysis used to determine the concentration of an identified analyte, not for physically separating components of a mixture.
Option C: Filtration separates insoluble solid particles from a liquid or gas. It is not suitable for separating the components of an emulsion like cream, where the fat globules are finely dispersed and would likely pass through or clog the filter.
Option D: Amalgamation is the process of combining or mixing, often used to describe the mixing of a metal with mercury. It is the opposite of separation.

Visual 1: Diagram: A laboratory centrifuge showing test tubes with a mixture before and after centrifugation, illustrating the separation of layers based on density.
Visual 2: Infographic: The industrial process of butter making from cream, highlighting the large-scale centrifugation step where fat is separated from buttermilk.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physical separation techniques for mixtures as background academic context rather than a clinical decision trigger.
Centrifugation is a fundamental technique in clinical laboratories. It is essential for separating whole blood into its components: red blood cells, plasma, and the buffy coat (white blood cells and platelets).
This separation is a critical first step for a vast range of diagnostic tests, including biochemical analysis of plasma/serum, hormone assays, and coagulation studies.
What if? If a blood sample for a plasma glucose test was not centrifuged promptly, the red blood cells would continue to metabolize the glucose in the sample (glycolysis), leading to a falsely low glucose reading. This could result in a missed diagnosis of hyperglycemia or diabetes mellitus.

How to Approach the Question

First, identify the nature of the substances involved. Cream is an emulsion of fat (less dense) in a water-based liquid (more dense).
The question asks for a method of separation. This implies a physical process.
Evaluate each option based on its scientific definition:
Titration is a chemical measurement method.
Filtration separates undissolved solids from a liquid.
Amalgamation is a process of mixing or combining.

Concept Tested & Keywords

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