Physics
A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan

Increases
Decreases
Remains the same
First increases and then decreases

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

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