Physics
For which one of the following, ''Diodes' are generally used for?

Modulation
Amplification
Rectification
Filtration

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Physics
A transformer

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

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Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun
the sun is between the moon and the earth
the moon is between the sun and the earth

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