Physics
An electric fuse is based on

The magnetic effect of the current
All of these
The chemical effect of the current
The heating effect of the current

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

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
Water has high surface tension

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Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Burst after reaching some height
Reach a particular height and remain floating
Reach a particular height and start coming down

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