What principle is applied in centrifugation? Give examples where this method is applied to separate mixtures. [3 MARKS]

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Solution

Principle : 1 Mark
Four examples : 0.5 Mark each

Centrifugation works on the principle in which the denser particles are forced to the bottom and the lighter particles stays at the top when spun rapidly.

Examples are:

i. Separating cream from milk (cream comes as top layer)

ii. Used in diagnostic laboratories for blood and urine tests.

iii. Used in washing machines to squeeze out water from wet clothes.

iv. Used in preparing lactic cultures to prepare cheese (paneer) from milk in dairies.

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