Physics
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ?

Circle
Parabolic
Hyper–parabolic
Great circle

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Metals have higher thermal capacity than plastics
Plastics have a lower density than metals
Plastics have a higher thermal conductivity than metals
Metals are good conductors of heat

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Physics
A white and smooth surface is

Good absorber and good reflector of heat
Bad absorber and bad reflector of heat
Good absorber and bad reflector of heat
Bad absorber and good reflector of heat

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