Physics
The device which transfer the signal from low resistance region to high resistance region is

Diode
Capacitor
Transistor
Inductor

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

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

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