Physics
The velocity of sound in moist air is more than in dry air because the moist air has

Less pressure than dry air.
Less density than dry air.
More density than dry air.
More pressure than dry air.

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Physics
The nature of fuse wire is

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

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

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

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