Physics
Transformer is a device to convert

C. to A.C.
Mechanical energy into Electrical energy
Low voltage D.C. into high voltage D.C.
Low voltage A.C. into high voltage A.C.

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
The person can sit on it like a raft
It increases the volume of the person to keep him afloat
It decreases the volume of the person to keep him afloat

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The pressure at high altitudes is greater than that on the plains
The blood pressure fluctuates and finally decreases drastically
The blood pressure of a person increases at high altitudes
The pressure of blood in capillaries is greater than the outside pressure

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