Physics
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is

The same in both cases in all respects
Of higher pitch when train arrives
Of higher intensity when train arrives
Of higher pitch when train departs

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Physics
Energy in reflected light :

Increases with the increase in angle
Decreases with the increase in angle of incidence
Becomes maximum for angle of incidence equal to 45°
Does not depends on the angle of incidence

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Physics
Light houses are places with powerful lights to :

Guide and help large crowds at religious gathering during nights
Guide and resolve traffic jams in crowded metro-cities during nights
Guide and warn the ships coming from different directions in the ocean
Indicate to the incoming warships, the location of a harbour during night

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