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| Q. |
When milk is churned, the cream separates from it clue to: |
| A. | Frictional force |
| B. | Centrifugal force |
| C. | Gravitation al force |
| D. | Viscous forces |
| Answer» B. Centrifugal force | |
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Explanation: The extraction of cream happens because of the work of centrifugal force which works outward. The separation of cream from milk is based on the fact that when liquids of different specific gravities revolve around the same centre at the same distance with the same angular velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk can be regarded as two liquids of different specific gravities, the serum and the fat. |
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