Physics
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

Will decrease
Will increase
Varies with the increase of depth of the immersion of the iron piece
Does not change

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

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