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Q. |
When the milk is churned vigorously the cream from it is separated out clue to – |
A. | Centripetal force |
B. | Gravitational force |
C. | Frictional force |
D. | Centrifugal force |
Answer» D. Centrifugal force | |
Explanation: The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum. |
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