Physics
A fresh egg when placed in salt water will

Burst
Float
Sink and go to the bottom
Sink but will not go to the bottom

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Physics
Skating on ice is possible because

The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The surface of ice is smooth
The pressure on the ice due to skate raises its melting point
Ice is cold

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

The sea is-deeper than the river
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 wider than the river

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