Physics
In the case of bodies falling under gravity which of the following remains constant at a given place?

All listed here
Kinetic energy
Acceleration
Potential energy

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

It uses more powerful lenses
The velocity of electron is smaller than that of visible light
The electrons have more energy than the light particles
The wavelength of electrons is smaller as compared to the wavelength of visible light

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Physics
Railway tracks are banked on curves

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

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