Physics
The mercury and sodium street lamps light up because of :

Electron absorption
Electron emission
Atomic absorption
Atomic emission

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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
Albumin dissolves in salt solution and egg becomes lighter
Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs

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Physics
In the process of magnetisation of a bar

Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only some parts of the outer layers of the bar get magnetised

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