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

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

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Physics
Circuit breaker usually operate under

Sub-transient state of short-circuit current
Steady state of short-circuit current
Transient state of short-circuit current
After D. C. component has ceased

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