Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is-deeper than the river
The sea is wider than the river

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Physics
The nature of fuse wire is

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

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