Physics
A transformer

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

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Physics
Absolute Zero is defined as

At which liquid Helium boils
At which water boils at 298K
The temperature at which all molecular motion ceases
At which the volume becomes zero

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Physics
The bats can fly in the dark because

They generate flashes of light
They have weak legs and are likely to be attacked by predators
They can see the objects in darkness
They generate ultrasonic sound waves

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