Physics
Sound is heard over longer distances on rainy days because

Sound travels slowly in moist air
Moist air does not absorb sound
Sound travels faster in moist air
Moist air absorbs sound

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

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