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

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

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

plastics have a lower density than metals
metals have higher thermal capacity than plastics
metals are good conductor of heat
plastics have a higher thermal conductivity than metals

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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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