Physics
Pycnometer is an instrument used to measure the

Density
Intensity of earthquake
High temperatures
Intensity of solar radiation

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

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Physics
Railway tracks are banked on curves

necessary centripetal force may be obtained from the horizontal component of the weight of the train
the train may not fly off in the opposite direction
to avoid frictional force between the tracks and wheels
necessary centrifugal force may be obtained from the horizontal component weight of the train

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