Physics
The blue colour of sky is due to

Scattering of longer wavelengths of sunlight in the atmosphere
Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Refraction of sunlight

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Physics
Light houses are places with powerful lights to :

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

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Physics
What is the direction of torque?

Parallel to the radius
Same as the direction of applied force
Perpendicular to the direction of applied force
Opposite to the direction of applied force

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