Physics
A water tank appears shallower when it is viewed from top due to

Reflection
Rectilinear propagation of light
Total internal reflection
Refraction

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Physics
Light houses are places with powerful lights to :

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

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

They fall with same ultimate velocity
Their velocity increases and they fall with same velocity on the earth
Their velocity increases and they fall with different velocity on the earth
They fall with that ultimate velocity, which are different for different droplets

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