Physics
A piece of wood is held under water. The upthrust on it will be:

Equal to the weight of the wood
More than weight of the wood
Less than weight of the wood
Zero

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Physics
A balloon filled with hydrogen will

Reach a particular height and start coming down
Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and remain floating

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Physics
A transformer

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

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