Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Both silver and gold pieces weigh equal
The gold piece will weigh more
Weighing will depend on their masses
The silver piece will weigh more

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Physics
A transformer

Converts electrical energy into mechanical energy
Converts DC to AC
Converts AC voltage to D.C. voltage
Is used to decrease or increase AC voltage

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