Physics
When the milk is churned vigorously the cream from it is separated out due to

Gravitational force
Centrifugal force
Centripetal force
Frictional force

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Water has high surface tension
Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs
Albumin dissolves in salt solution and egg becomes lighter

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Physics
The velocity of sound in air

Does not depend on temperature
Decreases with decrease of temperature
Decreases with increase of temperature
Increases with decrease of temperature

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