Physics
What is the name of the device used to convert alternating current into direct current ?

Ammeter
Transformer
Rectifier
Galvanometer

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in rolling a stone is less than in lifting it.
Work done in both is same but the rate of doing work is less in rolling.
Work done in lifting the stone is equal to rolling it.
Work done in rolling is more than in lifting.

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