Physics
The nature of fuse wire is

High resistance and high melting point.
Low resistance and high melting point.
Low resistance and low melting point.
High resistance and low melting point.

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Steel can be saved
Air-gaps are necessary for bearing the weight of running train
Accidents due to expansion in summer can be avoided
Accidents due to contraction in winter can be avoided

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