Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The mercury level starts falling
The mercury level starts rising
The bell jar breaks up
The mercury level does not change

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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 sea is wider 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

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